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Name: ____________________ Date: ____________
1.Easy
A practice arterial blood gas shows pH 7.56, PaCO₂ 48 mmHg (6.4 kPa) and HCO₃⁻ 42 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.56PaCO₂ 48 mmHg (6.4 kPa)HCO₃⁻ 42 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
2.Easy
A practice arterial blood gas shows pH 7.64, PaCO₂ 23 mmHg (3.1 kPa) and HCO₃⁻ 24 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.64PaCO₂ 23 mmHg (3.1 kPa)HCO₃⁻ 24 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
3.Medium
A practice arterial blood gas shows pH 7.08, PaCO₂ 38 mmHg (5.1 kPa) and HCO₃⁻ 11 mmol/L. The primary disorder is metabolic acidosis. How far is it compensated? Click your answer.
pH 7.08PaCO₂ 38 mmHg (5.1 kPa)HCO₃⁻ 11 mmol/L
1uncompensated
2partially compensated
3fully compensated
4.Medium
Practice values: Na⁺ 131 mmol/L, glucose 11 mmol/L and urea 19.8 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.
Na⁺ 131 mmol/Lglucose 11 mmol/Lurea 19.8 mmol/L
Osm = mOsm/kg
5.Hard
A practice gas shows a metabolic acidosis: pH 7.32, PaCO₂ 34 mmHg (4.5 kPa), HCO₃⁻ 17 mmol/L. Compare the measured PaCO₂ with Winter’s formula. Click your interpretation.
pH 7.32PaCO₂ 34 mmHg (4.5 kPa)HCO₃⁻ 17 mmol/L
1appropriate compensation
2added respiratory acidosis
3added respiratory alkalosis
6.Hard
At sea level, a practice gas taken on 50% oxygen shows PaO₂ 87 mmHg (11.6 kPa) and PaCO₂ 37 mmHg (4.9 kPa). Use PAO₂ = FiO₂·(760 − 47) − PaCO₂/0.8 to find the A–a gradient.