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Name: ____________________ Date: ____________
1.Easy
A practice arterial blood gas shows pH 7.23, PaCO₂ 69 mmHg (9.2 kPa) and HCO₃⁻ 28 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.23PaCO₂ 69 mmHg (9.2 kPa)HCO₃⁻ 28 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
2.Easy
A practice arterial blood gas shows pH 7.49, PaCO₂ 48 mmHg (6.4 kPa) and HCO₃⁻ 35 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.49PaCO₂ 48 mmHg (6.4 kPa)HCO₃⁻ 35 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
3.Medium
A practice arterial blood gas shows pH 7.25, PaCO₂ 80 mmHg (10.7 kPa) and HCO₃⁻ 34 mmol/L. The primary disorder is respiratory acidosis. How far is it compensated? Click your answer.
pH 7.25PaCO₂ 80 mmHg (10.7 kPa)HCO₃⁻ 34 mmol/L
1uncompensated
2partially compensated
3fully compensated
4.Medium
A practice arterial blood gas shows pH 7.11, PaCO₂ 39 mmHg (5.2 kPa) and HCO₃⁻ 12 mmol/L. The primary disorder is metabolic acidosis. How far is it compensated? Click your answer.
pH 7.11PaCO₂ 39 mmHg (5.2 kPa)HCO₃⁻ 12 mmol/L
1uncompensated
2partially compensated
3fully compensated
5.Hard
At sea level, a practice gas taken on 50% oxygen shows PaO₂ 93 mmHg (12.4 kPa) and PaCO₂ 36 mmHg (4.8 kPa). Use PAO₂ = FiO₂·(760 − 47) − PaCO₂/0.8 to find the A–a gradient.
Practice values: Na⁺ 136, Cl⁻ 86 and HCO₃⁻ 16 mmol/L. Calculate the delta ratio (AG − 12)/(24 − HCO₃⁻), using AG = Na⁺ − (Cl⁻ + HCO₃⁻). Give two decimals.
Na⁺ 136 mmol/LCl⁻ 86 mmol/LHCO₃⁻ 16 mmol/L
delta ratio =
Answer key
1. respiratory acidosis
2. metabolic alkalosis
3. partially compensated
4. uncompensated
5. A–a gradient = 218.5 mmHg
6. delta ratio = 2.75
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