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Name: ____________________ Date: ____________
1.Easy
A practice arterial blood gas shows pH 7.53, PaCO₂ 20 mmHg (2.7 kPa) and HCO₃⁻ 16 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.53PaCO₂ 20 mmHg (2.7 kPa)HCO₃⁻ 16 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
2.Easy
A practice arterial blood gas shows pH 7.25, PaCO₂ 38 mmHg (5.1 kPa) and HCO₃⁻ 16 mmol/L. Which primary disorder is it? Click the cell in the grid.
pH 7.25PaCO₂ 38 mmHg (5.1 kPa)HCO₃⁻ 16 mmol/L
1respiratory acidosis
2metabolic acidosis
3respiratory alkalosis
4metabolic alkalosis
3.Medium
Practice values: Na⁺ 142 mmol/L, glucose 23.9 mmol/L and urea 25 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.
Na⁺ 142 mmol/Lglucose 23.9 mmol/Lurea 25 mmol/L
Osm = mOsm/kg
4.Medium
Practice values: Na⁺ 141 mmol/L, glucose 26.5 mmol/L and urea 4.5 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.
Na⁺ 141 mmol/Lglucose 26.5 mmol/Lurea 4.5 mmol/L
Osm = mOsm/kg
5.Hard
A practice gas shows a metabolic alkalosis with HCO₃⁻ 45 mmol/L. Use expected PaCO₂ = 0.7·HCO₃⁻ + 21 to find the expected PaCO₂.
HCO₃⁻ 45 mmol/L
PaCO₂ = mmHg
6.Hard
A practice gas shows a metabolic acidosis: pH 7.14, PaCO₂ 43 mmHg (5.7 kPa), HCO₃⁻ 14 mmol/L. Compare the measured PaCO₂ with Winter’s formula. Click your interpretation.
pH 7.14PaCO₂ 43 mmHg (5.7 kPa)HCO₃⁻ 14 mmol/L
1appropriate compensation
2added respiratory acidosis
3added respiratory alkalosis
Answer key
1. respiratory alkalosis
2. metabolic acidosis
3. Osm = 333 mOsm/kg
4. Osm = 313 mOsm/kg
5. PaCO₂ = 52.5 mmHg
6. added respiratory acidosis
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