Arterial blood gas interpretation worksheet with answers

A practice arterial blood gas shows pH 7.17, PaCO₂ 17 mmHg (2.3 kPa) and HCO₃⁻ 6 mmol/L. Which primary disorder is it? Click the cell in the grid.

1. 1respiratory acidosis
2. 2metabolic acidosis
3. 3respiratory alkalosis
4. 4metabolic alkalosis

A practice blood gas shows PaO₂ 110 mmHg (14.7 kPa) while the inspired oxygen is 30%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

A practice gas shows a metabolic acidosis with HCO₃⁻ 16 mmol/L. Use Winter’s formula to find the expected PaCO₂ (the centre of the range) in mmHg.

A practice arterial blood gas shows pH 7.55, PaCO₂ 41 mmHg (5.5 kPa) and HCO₃⁻ 35 mmol/L. The primary disorder is metabolic alkalosis. How far is it compensated? Click your answer.

1. 1uncompensated
2. 2partially compensated
3. 3fully compensated

A practice gas shows a respiratory acidosis: pH 7.34, PaCO₂ 62 mmHg (8.3 kPa), HCO₃⁻ 32 mmol/L. Use the rules ‘HCO₃⁻ rises 1 mmol/L per 10 mmHg (acute) or 3.5 mmol/L per 10 mmHg (chronic)’ to classify it. Click your answer.

1. 1acute
2. 2chronic
3. 3acute on chronic

A practice gas shows a metabolic alkalosis with HCO₃⁻ 30 mmol/L. Use expected PaCO₂ = 0.7·HCO₃⁻ + 21 to find the expected PaCO₂.