Arterial Blood Gas (ABG) Interpretation Practice Exam Answers

Arterial Blood Gas (ABG) Interpretation Practice Exam Answers

Interpreting arterial blood gases (ABGs) is a vital skill for healthcare professionals working in critical care, emergency medicine, respiratory therapy, and nursing. This Arterial Blood Gas (ABG) Interpretation Practice Exam is specifically designed to test and enhance your ability to analyze and diagnose complex acid-base disorders with clinical precision.

Whether you’re preparing for your board exams, reviewing for NCLEX or CCRN, or simply refining your clinical diagnostic skills, this exam provides in-depth, scenario-based questions and detailed Arterial Blood Gas (ABG) Interpretation Practice Exam Answers that teach you how to identify and manage respiratory and metabolic imbalances effectively.

This exam simulates real-life clinical environments where fast and accurate ABG interpretation can be the difference between timely treatment and delayed intervention. It helps you strengthen your understanding of pH, PaCO₂, HCO₃⁻, O₂, and base excess — while testing your ability to recognize and respond to respiratory acidosis, metabolic alkalosis, mixed disorders, and more.

What You’ll Learn and Reinforce

This practice exam is aligned with core clinical competencies and is designed to develop both foundational knowledge and critical reasoning in ABG interpretation. You’ll work through case-based questions that mimic actual scenarios found in hospital and emergency settings.

Core Concepts Covered:

• Understanding Normal ABG Values
  Review essential reference ranges and physiological indicators such as pH, partial pressures, and bicarbonate levels.
• Identifying Acid-Base Disorders
  Learn to differentiate between respiratory and metabolic acidosis or alkalosis, including fully and partially compensated states.
• Interpreting Complex Mixed Disorders
  Gain the skill to assess ABGs with more than one underlying imbalance, including those in chronic respiratory conditions or renal failure.
• Applying the Compensation Rules
  Use proven compensation formulas and clinical rules to assess if the body is appropriately compensating for a primary disorder.
• Real-World Clinical Scenarios
  Tackle realistic cases involving trauma, sepsis, COPD, diabetic ketoacidosis (DKA), renal disease, and post-operative complications.

Each question is followed by comprehensive explanations that walk you through the interpretation step-by-step, providing not just the correct answer — but the rationale behind it.

Why This ABG Interpretation Practice Exam Is Essential

Arterial blood gas analysis isn’t just about memorizing values — it’s about clinical judgment, speed, and precision. With this practice exam, you’ll develop the diagnostic thinking required in real-time situations, while reinforcing core knowledge essential for safe, effective patient care.

Whether you’re a nursing student, respiratory therapist, medical resident, or preparing for a critical care certification, the Arterial Blood Gas (ABG) Interpretation Practice Exam Answers provided in this resource will sharpen your understanding and improve your confidence.

FAQ

Q1: Who should use this ABG interpretation practice exam?
This practice exam is perfect for nursing students, medical students, respiratory therapists, critical care nurses, and anyone preparing for exams like NCLEX, CCRN, or USMLE.

Q2: What topics are covered in the exam?
It covers interpretation of pH, PaCO₂, HCO₃⁻, oxygenation, acid-base disorders (metabolic and respiratory), compensation mechanisms, and mixed disorders in real clinical contexts.

Q3: How do the Arterial Blood Gas (ABG) Interpretation Practice Exam Answers help me learn?
Each answer is fully explained with a breakdown of the values and logic used to reach the diagnosis, helping you build a clear, structured approach to ABG interpretation.

Q4: Is this practice exam based on current clinical standards?
Yes. It aligns with current clinical guidelines used in critical care, emergency medicine, and respiratory therapy, ensuring real-world application and exam relevance.

Q5: Can this help with board or licensure exams?
Absolutely. It’s designed to reinforce essential ABG knowledge and critical thinking needed to succeed in exams like NCLEX, CCRN, RRT, or even medical licensing tests.

 Questions

Which of the following represents normal arterial blood gas (ABG) values?

pH 7.25, PaCO₂ 55 mmHg, HCO₃⁻ 30 mEq/L
B. pH 7.45, PaCO₂ 35 mmHg, HCO₃⁻ 22 mEq/L
C. pH 7.35, PaCO₂ 45 mmHg, HCO₃⁻ 28 mEq/L
D. pH 7.50, PaCO₂ 20 mmHg, HCO₃⁻ 15 mEq/L

A pH of 7.30, PaCO₂ of 50 mmHg, and HCO₃⁻ of 24 mEq/L indicates:

Metabolic acidosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis

The term “compensated respiratory acidosis” means:

pH < 7.35, PaCO₂ ↑, HCO₃⁻ ↑
B. pH normal, PaCO₂ ↑, HCO₃⁻ ↑
C. pH > 7.45, PaCO₂ ↑, HCO₃⁻ ↓
D. pH normal, PaCO₂ ↓, HCO₃⁻ ↓

Which of the following can cause metabolic acidosis?

Vomiting
B. Hypoventilation
C. Diarrhea
D. Hyperventilation

What compensatory mechanism occurs in metabolic alkalosis?

Hyperventilation
B. Hypoventilation
C. Increased bicarbonate excretion
D. Increased bicarbonate reabsorption

A patient has pH 7.50, PaCO₂ 30 mmHg, and HCO₃⁻ 24 mEq/L. This is indicative of:

Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Metabolic alkalosis

The anion gap is useful in diagnosing:

Respiratory alkalosis
B. Non-anion gap metabolic acidosis
C. High-anion gap metabolic acidosis
D. Compensated respiratory acidosis

A pH of 7.20, PaCO₂ 60 mmHg, and HCO₃⁻ 28 mEq/L indicates:

Uncompensated metabolic acidosis
B. Partially compensated respiratory acidosis
C. Fully compensated respiratory acidosis
D. Mixed acidosis

Which ABG abnormality is commonly seen in sepsis?

Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Respiratory alkalosis

A patient with an opioid overdose is likely to present with:

Metabolic alkalosis
B. Respiratory alkalosis
C. Respiratory acidosis
D. Metabolic acidosis

PaO₂ levels below 60 mmHg are classified as:

Hypercapnia
B. Hypoxia
C. Hypoxemia
D. Hyperventilation

Which of the following represents uncompensated metabolic acidosis?

pH 7.25, PaCO₂ 35 mmHg, HCO₃⁻ 18 mEq/L
B. pH 7.36, PaCO₂ 40 mmHg, HCO₃⁻ 24 mEq/L
C. pH 7.45, PaCO₂ 25 mmHg, HCO₃⁻ 18 mEq/L
D. pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 26 mEq/L

Respiratory alkalosis is commonly caused by:

Hypoventilation
B. Diabetic ketoacidosis
C. Hyperventilation
D. Kidney failure

A patient with chronic obstructive pulmonary disease (COPD) is most likely to have:

Respiratory alkalosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Metabolic acidosis

If PaCO₂ increases, what happens to the pH?

It increases
B. It decreases
C. It remains unchanged
D. It fluctuates

A patient with pH 7.38, PaCO₂ 48 mmHg, and HCO₃⁻ 29 mEq/L has:

Fully compensated metabolic alkalosis
B. Fully compensated respiratory acidosis
C. Mixed acidosis
D. Normal ABG

Hyperventilation during a panic attack results in:

Respiratory acidosis
B. Metabolic acidosis
C. Respiratory alkalosis
D. Metabolic alkalosis

Which electrolyte imbalance often accompanies metabolic alkalosis?

Hyperkalemia
B. Hypokalemia
C. Hypernatremia
D. Hyponatremia

An ABG shows pH 7.55, PaCO₂ 25 mmHg, HCO₃⁻ 24 mEq/L. The interpretation is:

Metabolic alkalosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Respiratory acidosis

What is the primary buffer system in the body?

Phosphate buffer system
B. Bicarbonate buffer system
C. Protein buffer system
D. Hemoglobin buffer system

Hypoxemia is defined as:

PaO₂ < 80 mmHg
B. PaO₂ < 60 mmHg
C. PaO₂ > 100 mmHg
D. PaO₂ < 50 mmHg

Diabetic ketoacidosis typically results in:

Metabolic acidosis with high anion gap
B. Metabolic alkalosis with normal anion gap
C. Respiratory acidosis
D. Respiratory alkalosis

Which ABG finding is most consistent with acute asthma exacerbation?

Respiratory alkalosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Mixed alkalosis

Prolonged vomiting results in:

Metabolic acidosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis

Which compensatory mechanism is expected in respiratory acidosis?

Increased bicarbonate retention
B. Increased CO₂ excretion
C. Decreased bicarbonate reabsorption
D. Increased hydrogen ion excretion

The kidneys regulate pH by:

Adjusting PaO₂ levels
B. Adjusting PaCO₂ levels
C. Retaining or excreting bicarbonate
D. Retaining or excreting CO₂

A pH of 7.28, PaCO₂ of 55 mmHg, and HCO₃⁻ of 26 mEq/L suggests:

Respiratory acidosis
B. Metabolic acidosis
C. Mixed acidosis
D. Compensated respiratory acidosis

In which condition is PaCO₂ likely to decrease?

Hypoventilation
B. Pneumonia
C. Hyperventilation
D. COPD

Mixed metabolic acidosis and respiratory alkalosis may occur in:

Sepsis
B. Chronic renal failure
C. Diabetic ketoacidosis
D. Pulmonary embolism

What is the normal range for HCO₃⁻ in ABG analysis?

20-25 mEq/L
B. 22-28 mEq/L
C. 24-30 mEq/L
D. 25-35 mEq/L

Which of the following conditions can cause respiratory alkalosis?

Anxiety or panic attack
B. Chronic obstructive pulmonary disease (COPD)
C. Hypoventilation from opioid overdose
D. Renal failure

What is the primary abnormality in metabolic alkalosis?

Excess CO₂ retention
B. Decreased bicarbonate concentration
C. Increased bicarbonate concentration
D. Increased hydrogen ion concentration

A patient with pH 7.50, PaCO₂ 50 mmHg, and HCO₃⁻ 34 mEq/L has:

Metabolic alkalosis with partial respiratory compensation
B. Respiratory alkalosis with metabolic compensation
C. Metabolic acidosis with respiratory compensation
D. Respiratory acidosis

What compensatory mechanism is activated in metabolic acidosis?

Hypoventilation to retain CO₂
B. Hyperventilation to excrete CO₂
C. Renal excretion of bicarbonate
D. Renal retention of CO₂

A normal anion gap metabolic acidosis is most commonly caused by:

Diarrhea
B. Diabetic ketoacidosis
C. Lactic acidosis
D. Salicylate poisoning

Which of the following ABG results indicates respiratory failure?

PaO₂ 75 mmHg and PaCO₂ 40 mmHg
B. PaO₂ 85 mmHg and PaCO₂ 30 mmHg
C. PaO₂ 50 mmHg and PaCO₂ 60 mmHg
D. PaO₂ 92 mmHg and PaCO₂ 38 mmHg

A patient with asthma exacerbation has pH 7.32, PaCO₂ 60 mmHg, and HCO₃⁻ 26 mEq/L. This indicates:

Respiratory alkalosis
B. Respiratory acidosis
C. Metabolic acidosis
D. Mixed respiratory and metabolic acidosis

What is the hallmark of fully compensated metabolic acidosis?

Normal pH with low HCO₃⁻ and low PaCO₂
B. Low pH with low HCO₃⁻ and normal PaCO₂
C. High pH with low HCO₃⁻ and low PaCO₂
D. Normal pH with normal HCO₃⁻ and normal PaCO₂

A pH of 7.48, PaCO₂ 30 mmHg, and HCO₃⁻ 18 mEq/L suggests:

Uncompensated respiratory alkalosis
B. Partially compensated respiratory alkalosis
C. Fully compensated respiratory alkalosis
D. Mixed alkalosis

Which of the following causes metabolic alkalosis?

Ketoacidosis
B. Loop diuretic use
C. Lactic acidosis
D. Diarrhea

What ABG value determines the adequacy of ventilation?

pH
B. PaO₂
C. HCO₃⁻
D. PaCO₂

A pH of 7.52, PaCO₂ 45 mmHg, and HCO₃⁻ 36 mEq/L indicates:

Metabolic alkalosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Respiratory acidosis

A pH of 7.18, PaCO₂ 38 mmHg, and HCO₃⁻ 15 mEq/L suggests:

Metabolic acidosis without compensation
B. Metabolic alkalosis with compensation
C. Metabolic acidosis with compensation
D. Respiratory acidosis

A patient with severe diarrhea is likely to have:

Respiratory alkalosis
B. Metabolic acidosis
C. Metabolic alkalosis
D. Respiratory acidosis

Which of the following ABG patterns is consistent with lactic acidosis?

Low pH, low HCO₃⁻, and normal anion gap
B. Low pH, low HCO₃⁻, and high anion gap
C. High pH, high HCO₃⁻, and low anion gap
D. Normal pH, high HCO₃⁻, and low PaCO₂

In which situation would a patient experience mixed respiratory and metabolic acidosis?

Diabetic ketoacidosis with sepsis
B. Acute hyperventilation during anxiety
C. COPD exacerbation with vomiting
D. Acute renal failure with hyperventilation

A low PaO₂ with normal PaCO₂ and normal pH is indicative of:

Respiratory acidosis
B. Hypoxemia without ventilatory failure
C. Compensated respiratory acidosis
D. Mixed acidosis

Which ABG finding is most consistent with a pulmonary embolism?

Respiratory alkalosis
B. Respiratory acidosis
C. Metabolic acidosis
D. Mixed alkalosis

A patient with renal failure is likely to have which ABG abnormality?

Metabolic alkalosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Mixed alkalosis

What is the expected PaO₂ for a healthy individual breathing room air at sea level?

50-60 mmHg
B. 70-80 mmHg
C. 80-100 mmHg
D. 100-120 mmHg

Which of the following is true about PaCO₂ in respiratory acidosis?

It is low, indicating hyperventilation.
B. It is elevated, indicating hypoventilation.
C. It remains within normal range.
D. It compensates by increasing bicarbonate levels.

A pH of 7.22, PaCO₂ 28 mmHg, and HCO₃⁻ 12 mEq/L suggests:

Respiratory alkalosis
B. Metabolic acidosis with partial respiratory compensation
C. Mixed metabolic and respiratory acidosis
D. Fully compensated metabolic acidosis

In chronic respiratory acidosis, the kidneys compensate by:

Excreting more bicarbonate
B. Retaining hydrogen ions
C. Retaining bicarbonate
D. Increasing PaCO₂ levels

What is the best way to distinguish between acute and chronic respiratory acidosis?

Measure the pH alone
B. Check the PaO₂ level
C. Assess the bicarbonate concentration
D. Use the anion gap calculation

A patient with diabetic ketoacidosis is likely to have:

Respiratory alkalosis
B. Metabolic alkalosis
C. High anion gap metabolic acidosis
D. Normal anion gap metabolic acidosis

What is the normal range for arterial bicarbonate (HCO₃⁻) levels?

10-20 mEq/L
B. 22-26 mEq/L
C. 28-32 mEq/L
D. 15-18 mEq/L

A patient presents with pH 7.56, PaCO₂ 22 mmHg, and HCO₃⁻ 20 mEq/L. What is the likely diagnosis?

Compensated metabolic alkalosis
B. Partially compensated respiratory alkalosis
C. Fully compensated metabolic acidosis
D. Mixed alkalosis

Which of the following is a primary cause of metabolic acidosis?

Prolonged vomiting
B. Excessive diarrhea
C. Panic attack
D. Pulmonary embolism

A patient with pH 7.28, PaCO₂ 50 mmHg, and HCO₃⁻ 24 mEq/L is diagnosed with:

Respiratory alkalosis
B. Respiratory acidosis without compensation
C. Respiratory acidosis with metabolic compensation
D. Metabolic acidosis

What value indicates the effectiveness of oxygenation?

PaCO₂
B. HCO₃⁻
C. PaO₂
D. Base excess

A patient with pH 7.60, PaCO₂ 40 mmHg, and HCO₃⁻ 36 mEq/L has:

Compensated metabolic alkalosis
B. Uncompensated metabolic alkalosis
C. Respiratory alkalosis with metabolic compensation
D. Mixed acidosis

What is the most likely ABG abnormality in a patient with an opioid overdose?

Respiratory alkalosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Metabolic acidosis

Which of the following causes a high anion gap metabolic acidosis?

Renal tubular acidosis
B. Lactic acidosis
C. Diarrhea
D. Hyperchloremia

A PaO₂ of 55 mmHg indicates:

Normal oxygenation
B. Mild hypoxemia
C. Moderate hypoxemia
D. Severe hypoxemia

A pH of 7.38, PaCO₂ 48 mmHg, and HCO₃⁻ 30 mEq/L suggests:

Fully compensated metabolic acidosis
B. Fully compensated respiratory acidosis
C. Mixed acidosis
D. Partially compensated metabolic alkalosis

Which electrolyte imbalance commonly accompanies metabolic alkalosis?

Hyperkalemia
B. Hypokalemia
C. Hypernatremia
D. Hyponatremia

A mixed metabolic and respiratory acidosis could result from:

Severe sepsis with respiratory failure
B. Vomiting and hypoventilation
C. Diarrhea and hyperventilation
D. Panic attack with ketoacidosis

How does the body initially compensate for metabolic alkalosis?

By increasing bicarbonate excretion through the kidneys
B. By hyperventilating to lower CO₂ levels
C. By hypoventilating to retain CO₂
D. By increasing hydrogen ion excretion

In which scenario is the PaO₂/FiO₂ ratio used?

To assess metabolic acidosis
B. To evaluate hypoxemia in ARDS
C. To diagnose respiratory alkalosis
D. To measure acid-base compensation

A patient with a history of chronic renal failure is most likely to have which ABG abnormality?

High anion gap metabolic acidosis
B. Normal anion gap metabolic acidosis
C. Metabolic alkalosis
D. Respiratory acidosis

Which condition commonly causes respiratory alkalosis?

Chronic obstructive pulmonary disease (COPD)
B. Diabetic ketoacidosis
C. Hyperventilation syndrome
D. Hypoventilation due to neuromuscular disease

A patient has a pH of 7.25, PaCO₂ 30 mmHg, and HCO₃⁻ 16 mEq/L. This indicates:

Respiratory acidosis
B. Metabolic acidosis with respiratory compensation
C. Mixed acidosis
D. Respiratory alkalosis

Which of the following represents a normal PaCO₂ range?

20-25 mmHg
B. 30-35 mmHg
C. 35-45 mmHg
D. 50-60 mmHg

What is the primary disturbance in metabolic alkalosis?

Decreased HCO₃⁻
B. Increased HCO₃⁻
C. Decreased PaCO₂
D. Increased PaCO₂

Which parameter is used to calculate the anion gap?

Na⁺ – (Cl⁻ + HCO₃⁻)
B. (Na⁺ + K⁺) – (Cl⁻ + HCO₃⁻)
C. (HCO₃⁻ – PaCO₂) + Cl⁻
D. (Na⁺ + HCO₃⁻) – Cl⁻

In chronic respiratory alkalosis, the kidneys compensate by:

Excreting bicarbonate
B. Retaining hydrogen ions
C. Retaining bicarbonate
D. Increasing the respiratory rate

A pH of 7.50, PaCO₂ 20 mmHg, and HCO₃⁻ 24 mEq/L indicates:

Uncompensated respiratory alkalosis
B. Uncompensated metabolic alkalosis
C. Compensated respiratory acidosis
D. Fully compensated respiratory alkalosis

A patient with sepsis develops lactic acidosis. Which ABG abnormality is expected?

Metabolic alkalosis
B. Normal anion gap metabolic acidosis
C. High anion gap metabolic acidosis
D. Respiratory alkalosis

A patient presents with pH 7.32, PaCO₂ 55 mmHg, and HCO₃⁻ 25 mEq/L. What is the primary problem?

Metabolic acidosis
B. Respiratory alkalosis
C. Respiratory acidosis
D. Compensated metabolic alkalosis

Which of the following is a hallmark of respiratory acidosis?

Increased pH with decreased PaCO₂
B. Decreased pH with increased PaCO₂
C. Decreased pH with decreased HCO₃⁻
D. Normal pH with increased PaCO₂

A 60-year-old smoker with chronic bronchitis is likely to present with:

Acute respiratory acidosis
B. Chronic respiratory acidosis with compensation
C. Uncompensated metabolic acidosis
D. Fully compensated respiratory alkalosis

What is the normal value for base excess/deficit in ABG interpretation?

+5 to +10 mEq/L
B. -2 to +2 mEq/L
C. -10 to 0 mEq/L
D. +10 to +15 mEq/L

A patient with prolonged vomiting and a pH of 7.52, PaCO₂ 46 mmHg, and HCO₃⁻ 32 mEq/L has:

Metabolic alkalosis with partial compensation
B. Respiratory alkalosis with partial compensation
C. Fully compensated metabolic alkalosis
D. Mixed alkalosis

Which condition can cause respiratory alkalosis?

Renal failure
B. Hyperventilation due to anxiety
C. Acute asthma exacerbation
D. Prolonged diarrhea

A PaCO₂ of 48 mmHg and pH of 7.38 suggest:

Compensated metabolic acidosis
B. Compensated respiratory acidosis
C. Acute respiratory acidosis
D. Metabolic alkalosis

A mixed metabolic alkalosis and respiratory acidosis is most likely caused by:

Severe vomiting with hypoventilation
B. Diarrhea and hyperventilation
C. Renal failure with panic attack
D. Aspirin overdose

What is the normal PaO₂ in arterial blood for a healthy individual at sea level?

50-70 mmHg
B. 75-100 mmHg
C. 100-125 mmHg
D. 130-150 mmHg

A 25-year-old patient presents with pH 7.45, PaCO₂ 50 mmHg, and HCO₃⁻ 35 mEq/L. This indicates:

Compensated respiratory alkalosis
B. Compensated metabolic alkalosis
C. Mixed acidosis
D. Fully compensated metabolic acidosis

Which ABG result is consistent with aspirin overdose?

pH 7.25, PaCO₂ 28 mmHg, HCO₃⁻ 15 mEq/L
B. pH 7.50, PaCO₂ 45 mmHg, HCO₃⁻ 30 mEq/L
C. pH 7.35, PaCO₂ 55 mmHg, HCO₃⁻ 24 mEq/L
D. pH 7.60, PaCO₂ 30 mmHg, HCO₃⁻ 24 mEq/L

A patient with ARDS (Acute Respiratory Distress Syndrome) is likely to have:

Respiratory acidosis with severe hypoxemia
B. Metabolic alkalosis with hyperoxemia
C. High anion gap metabolic acidosis
D. Normal ABG values

A 70-year-old patient has a pH of 7.28, PaCO₂ of 50 mmHg, and HCO₃⁻ of 24 mEq/L. What does this indicate?

Respiratory acidosis
B. Metabolic acidosis
C. Combined respiratory and metabolic acidosis
D. Compensated respiratory alkalosis

A high anion gap metabolic acidosis is most commonly associated with:

Acute diarrhea
B. Lactic acidosis
C. Hypoventilation
D. Vomiting

Which ABG finding is consistent with acute pulmonary embolism?

Respiratory alkalosis with hypoxemia
B. Metabolic acidosis with hyperoxemia
C. Respiratory acidosis with hypercapnia
D. Normal ABG values

The primary disturbance in metabolic acidosis is:

Increased PaCO₂
B. Decreased PaCO₂
C. Increased HCO₃⁻
D. Decreased HCO₃⁻

A patient presents with pH 7.48, PaCO₂ 30 mmHg, and HCO₃⁻ 22 mEq/L. What does this indicate?

Respiratory alkalosis
B. Metabolic alkalosis
C. Combined respiratory and metabolic alkalosis
D. Compensated metabolic acidosis

What is the expected compensation in chronic metabolic acidosis?

Increased HCO₃⁻ reabsorption by the kidneys
B. Increased respiratory rate to lower PaCO₂
C. Decreased respiratory rate to raise PaCO₂
D. No compensation occurs in metabolic acidosis

A patient with a history of COPD has pH 7.37, PaCO₂ 60 mmHg, and HCO₃⁻ 36 mEq/L. This represents:

Compensated respiratory acidosis
B. Compensated metabolic acidosis
C. Acute respiratory acidosis
D. Uncompensated metabolic alkalosis

A mixed respiratory and metabolic acidosis could be caused by:

Asthma exacerbation with renal failure
B. Hyperventilation due to anxiety
C. Vomiting and dehydration
D. Aspirin overdose

The arterial oxygen content (PaO₂) reflects:

Oxygen bound to hemoglobin and dissolved in plasma
B. Oxygen only bound to hemoglobin
C. Oxygen only dissolved in plasma
D. Carbon dioxide levels in arterial blood

A normal anion gap is most likely found in:

Lactic acidosis
B. Diabetic ketoacidosis
C. Renal tubular acidosis
D. Methanol poisoning

Which condition is most likely to result in metabolic alkalosis?

Severe diarrhea
B. Chronic kidney disease
C. Prolonged vomiting
D. Salicylate poisoning

An ABG result of pH 7.31, PaCO₂ 55 mmHg, and HCO₃⁻ 26 mEq/L indicates:

Metabolic acidosis
B. Respiratory acidosis
C. Mixed acidosis
D. Compensated respiratory alkalosis

A patient with septic shock develops a high anion gap acidosis. Likely causes include:

Increased lactate due to tissue hypoxia
B. Excessive bicarbonate loss through diarrhea
C. Hyperventilation
D. Excessive vomiting

Which of the following is the primary cause of metabolic acidosis with a normal anion gap?

Methanol ingestion
B. Renal tubular acidosis
C. Lactic acidosis
D. Diabetic ketoacidosis

A pH of 7.60, PaCO₂ 20 mmHg, and HCO₃⁻ 22 mEq/L would indicate:

Compensated metabolic alkalosis
B. Compensated respiratory alkalosis
C. Uncompensated respiratory alkalosis
D. Mixed respiratory and metabolic alkalosis

A patient is hypoxic with pH 7.50, PaCO₂ 30 mmHg, and HCO₃⁻ 24 mEq/L. What is the likely cause?

Anxiety-induced hyperventilation
B. COPD exacerbation
C. Acute renal failure
D. Aspirin toxicity

Which of the following ABG values suggests acute respiratory failure?

PaO₂ 90 mmHg, PaCO₂ 40 mmHg
B. PaO₂ 60 mmHg, PaCO₂ 60 mmHg
C. PaO₂ 80 mmHg, PaCO₂ 35 mmHg
D. PaO₂ 95 mmHg, PaCO₂ 45 mmHg

A patient presents with pH 7.20, PaCO₂ 60 mmHg, and HCO₃⁻ 28 mEq/L. This indicates:

Chronic respiratory acidosis with compensation
B. Acute respiratory acidosis without compensation
C. Metabolic acidosis
D. Mixed acidosis

Which ABG result is most consistent with hyperventilation syndrome?

pH 7.60, PaCO₂ 20 mmHg, HCO₃⁻ 22 mEq/L
B. pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 26 mEq/L
C. pH 7.38, PaCO₂ 40 mmHg, HCO₃⁻ 24 mEq/L
D. pH 7.22, PaCO₂ 60 mmHg, HCO₃⁻ 28 mEq/L

What is the expected response in acute metabolic acidosis?

Hyperventilation to reduce PaCO₂
B. Hypoventilation to retain PaCO₂
C. Increased bicarbonate excretion
D. Decreased bicarbonate reabsorption

A patient with pH 7.46, PaCO₂ 32 mmHg, and HCO₃⁻ 20 mEq/L likely has which condition?

Compensated metabolic alkalosis
B. Compensated respiratory alkalosis
C. Partially compensated respiratory alkalosis
D. Uncompensated metabolic alkalosis

What is the expected PaCO₂ compensation for a metabolic acidosis with HCO₃⁻ of 16 mEq/L?

PaCO₂ = 40 mmHg
B. PaCO₂ = 32 mmHg
C. PaCO₂ = 28 mmHg
D. PaCO₂ = 24 mmHg

A patient has a pH of 7.25, PaCO₂ of 25 mmHg, and HCO₃⁻ of 15 mEq/L. What does this indicate?

Mixed acidosis
B. Metabolic acidosis with respiratory compensation
C. Respiratory acidosis with renal compensation
D. Compensated metabolic alkalosis

Which electrolyte imbalance is most often associated with metabolic alkalosis?

Hyperkalemia
B. Hypokalemia
C. Hypernatremia
D. Hyponatremia

Which of the following is a common cause of respiratory alkalosis?

Diabetic ketoacidosis
B. Hypoventilation due to opioid overdose
C. High-altitude exposure
D. Renal failure

The Winter’s formula helps predict compensatory PaCO₂ in:

Respiratory acidosis
B. Metabolic acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis

Which ABG value represents compensated metabolic alkalosis?

pH 7.48, PaCO₂ 48 mmHg, HCO₃⁻ 30 mEq/L
B. pH 7.42, PaCO₂ 47 mmHg, HCO₃⁻ 30 mEq/L
C. pH 7.32, PaCO₂ 50 mmHg, HCO₃⁻ 25 mEq/L
D. pH 7.36, PaCO₂ 30 mmHg, HCO₃⁻ 18 mEq/L

A patient has pH 7.50, PaCO₂ 52 mmHg, and HCO₃⁻ 40 mEq/L. This represents:

Metabolic alkalosis with respiratory compensation
B. Respiratory alkalosis with metabolic compensation
C. Uncompensated metabolic alkalosis
D. Mixed alkalosis

Which condition is most likely to cause a mixed metabolic and respiratory acidosis?

Sepsis with multi-organ failure
B. Hyperventilation due to anxiety
C. Chronic obstructive pulmonary disease (COPD)
D. Aspirin overdose

A 45-year-old patient has ABG values of pH 7.33, PaCO₂ 55 mmHg, and HCO₃⁻ 30 mEq/L. What is the most likely condition?

Chronic respiratory acidosis with compensation
B. Acute respiratory acidosis with no compensation
C. Metabolic alkalosis with compensation
D. Compensated metabolic acidosis

What ABG findings are consistent with acute salicylate poisoning?

Respiratory acidosis with hypoxemia
B. Metabolic acidosis and respiratory alkalosis
C. Metabolic alkalosis and respiratory acidosis
D. Normal ABG

In metabolic alkalosis due to vomiting, the expected ABG findings are:

High pH, low PaCO₂, high HCO₃⁻
B. Low pH, high PaCO₂, low HCO₃⁻
C. High pH, high PaCO₂, high HCO₃⁻
D. Normal pH, normal PaCO₂, high HCO₃⁻

An ABG showing pH 7.29, PaCO₂ 60 mmHg, and HCO₃⁻ 30 mEq/L indicates:

Acute respiratory acidosis
B. Compensated respiratory alkalosis
C. Chronic respiratory acidosis with compensation
D. Metabolic acidosis with respiratory compensation

Which is a hallmark of compensated respiratory alkalosis?

Decreased HCO₃⁻ with normal pH
B. Increased PaCO₂ with decreased HCO₃⁻
C. Increased HCO₃⁻ with decreased pH
D. Increased PaCO₂ with increased HCO₃⁻

What is the most likely cause of metabolic acidosis with an anion gap of 35 mEq/L?

Diarrhea
B. Acute renal failure
C. Aspirin overdose
D. Hyperaldosteronism

In diabetic ketoacidosis (DKA), the expected ABG pattern is:

Normal pH, high HCO₃⁻, and normal PaCO₂
B. Low pH, low HCO₃⁻, and low PaCO₂
C. Low pH, high HCO₃⁻, and low PaCO₂
D. High pH, high PaCO₂, and high HCO₃⁻

A mixed respiratory alkalosis and metabolic acidosis is often seen in:

Aspirin toxicity
B. Chronic obstructive pulmonary disease
C. Renal failure
D. Heart failure

A patient with Guillain-Barré syndrome is likely to develop which ABG pattern?

Respiratory alkalosis
B. Metabolic acidosis
C. Respiratory acidosis
D. Mixed acidosis

Which of the following ABG results indicates hyperventilation secondary to anxiety?

pH 7.50, PaCO₂ 28 mmHg, HCO₃⁻ 24 mEq/L
B. pH 7.32, PaCO₂ 50 mmHg, HCO₃⁻ 30 mEq/L
C. pH 7.28, PaCO₂ 60 mmHg, HCO₃⁻ 28 mEq/L
D. pH 7.44, PaCO₂ 40 mmHg, HCO₃⁻ 26 mEq/L

A patient with chronic kidney disease develops metabolic acidosis. The ABG would most likely show:

Decreased pH, decreased HCO₃⁻, and normal PaCO₂
B. Increased pH, decreased HCO₃⁻, and decreased PaCO₂
C. Normal pH, increased HCO₃⁻, and increased PaCO₂
D. Decreased pH, increased HCO₃⁻, and normal PaCO₂

What ABG pattern is expected in chronic obstructive pulmonary disease (COPD)?

Normal pH, low PaCO₂, low HCO₃⁻
B. Low pH, high PaCO₂, high HCO₃⁻
C. Normal pH, high PaCO₂, high HCO₃⁻
D. High pH, low PaCO₂, high HCO₃⁻

Which acid-base disorder is most likely in a patient with severe diarrhea?

Metabolic acidosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis

A patient has pH 7.60, PaCO₂ 20 mmHg, and HCO₃⁻ 22 mEq/L. The most likely cause is:

Acute anxiety attack
B. Diabetic ketoacidosis
C. Salicylate toxicity
D. Chronic kidney disease

What is the primary compensatory mechanism for metabolic alkalosis?

Hypoventilation to increase PaCO₂
B. Hyperventilation to decrease PaCO₂
C. Renal excretion of bicarbonate
D. Renal retention of hydrogen ions

A patient presents with pH 7.28, PaCO₂ 60 mmHg, and HCO₃⁻ 26 mEq/L. This indicates:

Uncompensated respiratory acidosis
B. Partially compensated metabolic acidosis
C. Mixed acidosis
D. Fully compensated respiratory acidosis

Which ABG finding suggests uncompensated metabolic acidosis?

pH 7.45, PaCO₂ 32 mmHg, HCO₃⁻ 19 mEq/L
B. pH 7.30, PaCO₂ 40 mmHg, HCO₃⁻ 18 mEq/L
C. pH 7.38, PaCO₂ 30 mmHg, HCO₃⁻ 17 mEq/L
D. pH 7.48, PaCO₂ 47 mmHg, HCO₃⁻ 34 mEq/L

In a patient with sepsis, ABG shows pH 7.20, PaCO₂ 25 mmHg, and HCO₃⁻ 10 mEq/L. What is the most likely diagnosis?

Lactic acidosis
B. Respiratory alkalosis
C. Metabolic alkalosis
D. Chronic respiratory acidosis

A patient with end-stage renal disease (ESRD) is likely to exhibit which ABG pattern?

High pH, low PaCO₂, low HCO₃⁻
B. Low pH, low PaCO₂, low HCO₃⁻
C. Normal pH, high PaCO₂, high HCO₃⁻
D. Low pH, normal PaCO₂, low HCO₃⁻

In metabolic acidosis with an anion gap, what is the primary unmeasured anion?

Albumin
B. Lactate
C. Chloride
D. Potassium

Which of the following ABG results is most consistent with acute respiratory alkalosis?

pH 7.48, PaCO₂ 30 mmHg, HCO₃⁻ 24 mEq/L
B. pH 7.31, PaCO₂ 50 mmHg, HCO₃⁻ 24 mEq/L
C. pH 7.38, PaCO₂ 38 mmHg, HCO₃⁻ 22 mEq/L
D. pH 7.50, PaCO₂ 55 mmHg, HCO₃⁻ 35 mEq/L

A patient with diabetic ketoacidosis has pH 7.15, PaCO₂ 20 mmHg, and HCO₃⁻ 8 mEq/L. What compensatory mechanism is occurring?

Renal excretion of hydrogen ions
B. Hyperventilation to lower PaCO₂
C. Retention of bicarbonate by kidneys
D. Respiratory compensation by hypoventilation

Which ABG pattern suggests mixed acidosis?

pH 7.28, PaCO₂ 55 mmHg, HCO₃⁻ 18 mEq/L
B. pH 7.36, PaCO₂ 45 mmHg, HCO₃⁻ 26 mEq/L
C. pH 7.45, PaCO₂ 30 mmHg, HCO₃⁻ 20 mEq/L
D. pH 7.32, PaCO₂ 40 mmHg, HCO₃⁻ 18 mEq/L

A 35-year-old patient has pH 7.41, PaCO₂ 26 mmHg, and HCO₃⁻ 16 mEq/L. What is the interpretation?

Uncompensated respiratory alkalosis
B. Fully compensated metabolic acidosis
C. Fully compensated respiratory alkalosis
D. Normal acid-base balance

In chronic respiratory alkalosis, what compensation is expected?

Decreased renal bicarbonate reabsorption
B. Increased renal bicarbonate reabsorption
C. Increased hydrogen ion secretion by the kidneys
D. Increased production of lactate

Which condition is most likely to cause metabolic alkalosis?

Loop diuretic therapy
B. Pulmonary embolism
C. Diabetic ketoacidosis
D. Sepsis

A patient presents with pH 7.54, PaCO₂ 28 mmHg, and HCO₃⁻ 24 mEq/L. The most likely cause is:

Acute respiratory alkalosis due to hyperventilation
B. Chronic metabolic alkalosis
C. Mixed alkalosis
D. Compensated respiratory alkalosis

Which compensatory response is expected in respiratory acidosis?

Renal retention of bicarbonate
B. Increased ventilation to reduce PaCO₂
C. Renal excretion of bicarbonate
D. Decreased production of hydrogen ions

A patient has a pH of 7.50, PaCO₂ 30 mmHg, and HCO₃⁻ 22 mEq/L. This ABG result suggests:

Acute respiratory alkalosis
B. Compensated metabolic alkalosis
C. Uncompensated metabolic acidosis
D. Fully compensated respiratory acidosis

The anion gap is calculated using which formula?

Na⁺ + K⁺ – (Cl⁻ + HCO₃⁻)
B. Na⁺ – (Cl⁻ + HCO₃⁻)
C. K⁺ – (Cl⁻ + HCO₃⁻)
D. Na⁺ – (Cl⁻ + HCO₃⁻ + K⁺)

A patient has the following ABG: pH 7.36, PaCO₂ 70 mmHg, and HCO₃⁻ 40 mEq/L. This pattern represents:

Fully compensated respiratory acidosis
B. Partially compensated metabolic acidosis
C. Mixed acidosis
D. Fully compensated metabolic acidosis

What ABG findings would you expect in a patient with aspirin overdose?

pH 7.50, PaCO₂ 20 mmHg, HCO₃⁻ 14 mEq/L
B. pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 18 mEq/L
C. pH 7.60, PaCO₂ 40 mmHg, HCO₃⁻ 35 mEq/L
D. pH 7.40, PaCO₂ 30 mmHg, HCO₃⁻ 20 mEq/L

In metabolic acidosis, a normal anion gap suggests:

Renal tubular acidosis or diarrhea
B. Lactic acidosis or ketoacidosis
C. Aspirin overdose or methanol poisoning
D. Hypoventilation or chronic lung disease

A patient has pH 7.48, PaCO₂ 48 mmHg, and HCO₃⁻ 34 mEq/L. This ABG is consistent with:

Fully compensated respiratory alkalosis
B. Partially compensated metabolic alkalosis
C. Uncompensated respiratory acidosis
D. Mixed alkalosis

Which acid-base disorder is most commonly associated with vomiting?

Metabolic alkalosis
B. Metabolic acidosis
C. Respiratory acidosis
D. Respiratory alkalosis

A patient presents with pH 7.25, PaCO₂ 60 mmHg, and HCO₃⁻ 28 mEq/L. What is the interpretation?

Acute respiratory acidosis
B. Chronic respiratory acidosis with partial compensation
C. Mixed respiratory and metabolic acidosis
D. Metabolic alkalosis

Which ABG pattern indicates uncompensated metabolic alkalosis?

pH 7.55, PaCO₂ 40 mmHg, HCO₃⁻ 36 mEq/L
B. pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 24 mEq/L
C. pH 7.44, PaCO₂ 32 mmHg, HCO₃⁻ 22 mEq/L
D. pH 7.60, PaCO₂ 60 mmHg, HCO₃⁻ 40 mEq/L

What is the expected pH range in a fully compensated acid-base disturbance?

7.00 to 7.20
B. 7.20 to 7.25
C. 7.35 to 7.45
D. 7.45 to 7.55

Which of the following conditions is most likely to cause respiratory alkalosis?

Chronic obstructive pulmonary disease (COPD)
B. Anxiety-induced hyperventilation
C. Pulmonary edema
D. Severe sepsis with lactic acidosis

A pH of 7.22, PaCO₂ of 65 mmHg, and HCO₃⁻ of 24 mEq/L suggests:

Acute respiratory acidosis without compensation
B. Acute respiratory acidosis with metabolic compensation
C. Chronic respiratory acidosis
D. Metabolic acidosis

A diabetic patient has pH 7.15, PaCO₂ 25 mmHg, and HCO₃⁻ 10 mEq/L. What acid-base abnormality is present?

Mixed metabolic acidosis and respiratory alkalosis
B. Metabolic acidosis with partial respiratory compensation
C. Respiratory alkalosis with metabolic compensation
D. Fully compensated metabolic acidosis

Which is the compensatory mechanism in respiratory alkalosis?

Increased renal hydrogen ion secretion
B. Decreased renal bicarbonate reabsorption
C. Increased respiratory rate
D. Increased bicarbonate buffer production

A patient has a PaO₂ of 50 mmHg, PaCO₂ of 60 mmHg, and pH of 7.30. What is the likely diagnosis?

Acute respiratory alkalosis
B. Chronic obstructive pulmonary disease (COPD) exacerbation
C. Pulmonary embolism
D. Metabolic acidosis

A normal anion gap metabolic acidosis is associated with which of the following?

Ketoacidosis
B. Diarrhea
C. Renal failure
D. Methanol poisoning

What does a widened anion gap in metabolic acidosis indicate?

Increased unmeasured anions like lactate or ketones
B. Decreased PaCO₂
C. Increased bicarbonate reabsorption
D. Chronic hypercapnia

A pH of 7.36, PaCO₂ of 28 mmHg, and HCO₃⁻ of 16 mEq/L is consistent with:

Uncompensated respiratory alkalosis
B. Compensated metabolic acidosis
C. Compensated metabolic alkalosis
D. Acute respiratory acidosis

Which of the following ABG results would suggest mixed acidosis?

pH 7.20, PaCO₂ 55 mmHg, HCO₃⁻ 18 mEq/L
B. pH 7.32, PaCO₂ 30 mmHg, HCO₃⁻ 16 mEq/L
C. pH 7.50, PaCO₂ 25 mmHg, HCO₃⁻ 20 mEq/L
D. pH 7.45, PaCO₂ 40 mmHg, HCO₃⁻ 26 mEq/L

Which ABG pattern is most consistent with aspirin toxicity in the early stages?

Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Mixed metabolic acidosis and respiratory alkalosis

What is the normal range of the anion gap (without potassium)?

4 to 8 mEq/L
B. 8 to 12 mEq/L
C. 12 to 16 mEq/L
D. 16 to 20 mEq/L

In metabolic alkalosis, which electrolyte disturbance is most likely?

Hyperkalemia
B. Hypokalemia
C. Hypercalcemia
D. Hypernatremia

A patient’s ABG shows pH 7.33, PaCO₂ 30 mmHg, and HCO₃⁻ 15 mEq/L. What is the likely acid-base disorder?

Fully compensated respiratory alkalosis
B. Partially compensated metabolic acidosis
C. Uncompensated metabolic acidosis
D. Mixed acidosis

A patient with severe diarrhea presents with pH 7.25, PaCO₂ 38 mmHg, and HCO₃⁻ 18 mEq/L. What is the acid-base disorder?

Metabolic acidosis without compensation
B. Metabolic acidosis with respiratory compensation
C. Mixed acidosis
D. Respiratory acidosis with metabolic compensation

Which of the following ABG findings is consistent with acute respiratory acidosis?

pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 24 mEq/L
B. pH 7.50, PaCO₂ 30 mmHg, HCO₃⁻ 24 mEq/L
C. pH 7.40, PaCO₂ 60 mmHg, HCO₃⁻ 36 mEq/L
D. pH 7.35, PaCO₂ 60 mmHg, HCO₃⁻ 30 mEq/L

What acid-base disturbance is typically seen in a patient with sepsis and elevated lactate levels?

Respiratory acidosis
B. Metabolic acidosis with a high anion gap
C. Metabolic alkalosis
D. Respiratory alkalosis

A mixed acid-base disorder with metabolic alkalosis and respiratory acidosis might occur in which condition?

Chronic obstructive pulmonary disease (COPD) with vomiting
B. Severe asthma with diarrhea
C. Diabetic ketoacidosis with renal failure
D. Aspirin overdose

Which ABG result is most consistent with hyperventilation syndrome?

pH 7.48, PaCO₂ 28 mmHg, HCO₃⁻ 22 mEq/L
B. pH 7.30, PaCO₂ 50 mmHg, HCO₃⁻ 28 mEq/L
C. pH 7.36, PaCO₂ 40 mmHg, HCO₃⁻ 24 mEq/L
D. pH 7.20, PaCO₂ 60 mmHg, HCO₃⁻ 24 mEq/L

Which condition can cause both respiratory alkalosis and metabolic acidosis simultaneously?

Pulmonary embolism
B. Salicylate toxicity
C. Renal tubular acidosis
D. Diabetic ketoacidosis

A pH of 7.55, PaCO₂ 50 mmHg, and HCO₃⁻ 40 mEq/L is indicative of:

Partially compensated metabolic alkalosis
B. Partially compensated respiratory alkalosis
C. Mixed alkalosis
D. Fully compensated metabolic alkalosis

What would you expect in ABG results for a patient with acute pulmonary edema?

pH 7.30, PaCO₂ 60 mmHg, HCO₃⁻ 24 mEq/L
B. pH 7.50, PaCO₂ 28 mmHg, HCO₃⁻ 22 mEq/L
C. pH 7.40, PaCO₂ 40 mmHg, HCO₃⁻ 24 mEq/L
D. pH 7.25, PaCO₂ 45 mmHg, HCO₃⁻ 20 mEq/L

In a patient with severe metabolic acidosis, which compensatory mechanism is expected?

Hyperventilation to decrease PaCO₂
B. Increased renal excretion of HCO₃⁻
C. Hypoventilation to increase PaCO₂
D. Increased renal reabsorption of PaCO₂

A patient with pH 7.32, PaCO₂ 50 mmHg, and HCO₃⁻ 28 mEq/L likely has:

Uncompensated respiratory acidosis
B. Partially compensated respiratory acidosis
C. Metabolic alkalosis with compensation
D. Mixed respiratory and metabolic alkalosis

A normal PaO₂ on room air is approximately:

50-70 mmHg
B. 75-100 mmHg
C. 100-150 mmHg
D. 150-200 mmHg

What acid-base abnormality is expected in a patient with diabetic ketoacidosis (DKA)?

Metabolic alkalosis
B. Metabolic acidosis with high anion gap
C. Respiratory acidosis
D. Metabolic acidosis with normal anion gap

A pH of 7.28, PaCO₂ of 55 mmHg, and HCO₃⁻ of 25 mEq/L suggests:

Acute respiratory acidosis without compensation
B. Acute respiratory acidosis with partial compensation
C. Chronic respiratory acidosis
D. Mixed metabolic and respiratory acidosis

Which condition is most likely to cause respiratory acidosis?

Panic attack
B. Chronic obstructive pulmonary disease (COPD)
C. Diarrhea
D. Vomiting

A high anion gap metabolic acidosis is commonly associated with:

Severe vomiting
B. Renal tubular acidosis
C. Methanol poisoning
D. Hyperventilation

The ABG results of pH 7.48, PaCO₂ 45 mmHg, and HCO₃⁻ 30 mEq/L suggest:

Uncompensated metabolic alkalosis
B. Fully compensated metabolic alkalosis
C. Uncompensated respiratory alkalosis
D. Mixed metabolic and respiratory alkalosis

What is the compensatory response to metabolic acidosis?

Increased respiratory rate to lower PaCO₂
B. Increased PaCO₂ to raise pH
C. Increased renal reabsorption of HCO₃⁻
D. Decreased respiratory rate to increase PaCO₂

A PaCO₂ level below 35 mmHg typically indicates:

Hypoventilation
B. Hyperventilation
C. Metabolic alkalosis
D. Mixed acidosis

A pH of 7.22, PaCO₂ of 22 mmHg, and HCO₃⁻ of 12 mEq/L suggests which primary acid-base abnormality?

Uncompensated metabolic acidosis
B. Partially compensated metabolic acidosis
C. Respiratory acidosis
D. Mixed respiratory and metabolic acidosis

A patient presents with an ABG of pH 7.50, PaCO₂ 25 mmHg, and HCO₃⁻ 22 mEq/L. What is the likely diagnosis?

Acute respiratory alkalosis
B. Compensated respiratory acidosis
C. Uncompensated metabolic alkalosis
D. Mixed alkalosis

A 35-year-old male presents with pH 7.28, PaCO₂ 65 mmHg, and HCO₃⁻ 25 mEq/L. What is the most likely cause of this imbalance?

Severe asthma exacerbation
B. Acute renal failure
C. Salicylate overdose
D. Gastrointestinal loss of bicarbonate

A patient with an opioid overdose has the following ABG results: pH 7.20, PaCO₂ 75 mmHg, and HCO₃⁻ 26 mEq/L. What is the primary acid-base disorder?

Metabolic acidosis
B. Respiratory acidosis
C. Mixed acidosis
D. Respiratory alkalosis

A 28-year-old female with acute anxiety is hyperventilating. Her ABG results are: pH 7.55, PaCO₂ 22 mmHg, and HCO₃⁻ 24 mEq/L. What is the acid-base diagnosis?

Acute respiratory alkalosis
B. Chronic respiratory alkalosis
C. Metabolic alkalosis
D. Mixed alkalosis

A patient with chronic kidney disease presents with pH 7.32, PaCO₂ 35 mmHg, and HCO₃⁻ 18 mEq/L. What compensatory mechanism is expected?

Decreased respiratory rate to retain CO₂
B. Increased respiratory rate to lower CO₂
C. Increased renal reabsorption of bicarbonate
D. Increased renal excretion of bicarbonate

A 65-year-old COPD patient on 2L/min oxygen has the following ABG: pH 7.36, PaCO₂ 55 mmHg, and HCO₃⁻ 30 mEq/L. What is the interpretation?

Acute respiratory acidosis
B. Chronic respiratory acidosis with compensation
C. Metabolic acidosis
D. Mixed respiratory and metabolic acidosis

A patient is found unconscious with ABG showing pH 7.15, PaCO₂ 30 mmHg, and HCO₃⁻ 10 mEq/L. What is the most likely underlying disorder?

Severe metabolic acidosis with respiratory compensation
B. Severe respiratory acidosis with metabolic compensation
C. Mixed respiratory and metabolic acidosis
D. Metabolic alkalosis

Which condition is most consistent with the following ABG: pH 7.60, PaCO₂ 40 mmHg, and HCO₃⁻ 38 mEq/L?

Metabolic alkalosis without compensation
B. Respiratory alkalosis
C. Fully compensated metabolic alkalosis
D. Mixed alkalosis

A 45-year-old patient with severe vomiting has ABG results: pH 7.50, PaCO₂ 48 mmHg, and HCO₃⁻ 34 mEq/L. What is the diagnosis?

Metabolic alkalosis with partial respiratory compensation
B. Respiratory alkalosis with compensation
C. Mixed respiratory and metabolic alkalosis
D. Uncompensated metabolic acidosis

A patient with diabetic ketoacidosis receives ABG results: pH 7.20, PaCO₂ 25 mmHg, and HCO₃⁻ 10 mEq/L. What compensation is present?

Respiratory alkalosis compensating for metabolic acidosis
B. Metabolic alkalosis compensating for respiratory acidosis
C. Fully compensated metabolic acidosis
D. No compensation present

A marathon runner collapses with severe dehydration. Her ABG shows: pH 7.30, PaCO₂ 40 mmHg, and HCO₃⁻ 18 mEq/L. What type of acidosis is this?

Respiratory acidosis
B. Metabolic acidosis without compensation
C. Metabolic acidosis with no respiratory compensation
D. Metabolic acidosis with respiratory compensation

ABG for a post-operative patient under shallow ventilation is: pH 7.28, PaCO₂ 48 mmHg, and HCO₃⁻ 24 mEq/L. What does this suggest?

Acute respiratory acidosis
B. Chronic respiratory acidosis
C. Metabolic acidosis
D. Mixed acidosis

A patient with sepsis has ABG results of pH 7.18, PaCO₂ 32 mmHg, and HCO₃⁻ 12 mEq/L. What is the expected anion gap?

Normal anion gap (8-12 mEq/L)
B. Elevated anion gap (>12 mEq/L)
C. Decreased anion gap (<8 mEq/L)
D. No correlation with anion gap

A patient with Guillain-Barré syndrome develops hypoventilation. What ABG abnormality would you expect?

Metabolic alkalosis
B. Respiratory acidosis
C. Metabolic acidosis
D. Respiratory alkalosis

What primary acid-base imbalance is expected in a patient with prolonged NG suction?

Metabolic alkalosis
B. Respiratory acidosis
C. Metabolic acidosis
D. Respiratory alkalosis

A 40-year-old female with aspirin overdose has ABG showing: pH 7.50, PaCO₂ 30 mmHg, and HCO₃⁻ 20 mEq/L. What type of imbalance is this?

Mixed respiratory alkalosis and metabolic acidosis
B. Respiratory acidosis with partial compensation
C. Uncompensated metabolic alkalosis
D. Compensated respiratory acidosis

What is the most likely diagnosis for a pH of 7.38, PaCO₂ of 55 mmHg, and HCO₃⁻ of 32 mEq/L in a COPD patient?

Acute respiratory acidosis
B. Fully compensated respiratory acidosis
C. Metabolic acidosis
D. Mixed respiratory and metabolic acidosis

In a patient with severe diarrhea, ABG results show pH 7.25, PaCO₂ 38 mmHg, and HCO₃⁻ 15 mEq/L. What is the likely acid-base disorder?

Non-anion gap metabolic acidosis
B. High anion gap metabolic acidosis
C. Respiratory acidosis
D. Mixed metabolic and respiratory acidosis

A patient with carbon monoxide poisoning has normal ABG values. Why might this occur?

CO affects hemoglobin saturation but not PaO₂
B. CO increases PaO₂ while lowering pH
C. CO raises bicarbonate without affecting PaCO₂
D. CO exclusively impacts ventilation rates

A 65-year-old male with a history of COPD presents to the ER with increasing shortness of breath. His ABG shows: pH 7.31, PaCO₂ 70 mmHg, and HCO₃⁻ 28 mEq/L. What is the most likely diagnosis?

Acute respiratory acidosis with partial compensation
B. Chronic respiratory acidosis with full compensation
C. Acute metabolic acidosis with respiratory compensation
D. Respiratory alkalosis

A 30-year-old female presents with hyperventilation following a panic attack. Her ABG results show: pH 7.49, PaCO₂ 25 mmHg, and HCO₃⁻ 24 mEq/L. What is the interpretation?

Acute respiratory alkalosis
B. Chronic respiratory alkalosis
C. Metabolic alkalosis
D. Acute respiratory acidosis

A patient with diabetic ketoacidosis (DKA) has the following ABG results: pH 7.25, PaCO₂ 30 mmHg, and HCO₃⁻ 12 mEq/L. What is the most likely acid-base disturbance?

Metabolic acidosis with respiratory compensation
B. Respiratory acidosis with metabolic compensation
C. Metabolic alkalosis
D. Respiratory alkalosis

A 75-year-old male is admitted with pneumonia. His ABG shows: pH 7.31, PaCO₂ 55 mmHg, and HCO₃⁻ 28 mEq/L. What is the interpretation?

Acute respiratory acidosis with compensation
B. Chronic respiratory acidosis
C. Metabolic acidosis
D. Respiratory alkalosis

A patient with severe vomiting has the following ABG results: pH 7.48, PaCO₂ 48 mmHg, and HCO₃⁻ 36 mEq/L. What is the diagnosis?

Metabolic alkalosis with respiratory compensation
B. Acute respiratory acidosis
C. Mixed respiratory and metabolic alkalosis
D. Chronic respiratory alkalosis

A 40-year-old female presents with dizziness and chest pain. ABG results show: pH 7.52, PaCO₂ 30 mmHg, and HCO₃⁻ 22 mEq/L. What is the interpretation?

Respiratory alkalosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Mixed acidosis

A patient presents with profound fatigue and confusion. Her ABG shows: pH 7.17, PaCO₂ 20 mmHg, and HCO₃⁻ 8 mEq/L. What is the most likely cause of this acid-base disturbance?

Severe metabolic acidosis with respiratory compensation
B. Respiratory alkalosis
C. Metabolic alkalosis
D. Respiratory acidosis

A 60-year-old male with chronic kidney disease presents with confusion and drowsiness. His ABG results show: pH 7.30, PaCO₂ 50 mmHg, and HCO₃⁻ 18 mEq/L. What is the diagnosis?

Chronic respiratory acidosis
B. Metabolic acidosis with respiratory compensation
C. Respiratory alkalosis
D. Mixed acidosis

A 50-year-old patient with severe diarrhea presents with the following ABG results: pH 7.34, PaCO₂ 40 mmHg, and HCO₃⁻ 16 mEq/L. What is the interpretation?

Non-anion gap metabolic acidosis
B. High anion gap metabolic acidosis
C. Respiratory alkalosis
D. Metabolic alkalosis

A patient with acute kidney failure has the following ABG: pH 7.25, PaCO₂ 38 mmHg, and HCO₃⁻ 14 mEq/L. What is the diagnosis?

Metabolic acidosis with respiratory compensation
B. Respiratory acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis