Arterial blood gas interpretation worksheet with answers

Free printable Arterial blood gas interpretation worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

A practice blood gas shows PaO₂ 70 mmHg (9.3 kPa) while the inspired oxygen is 28%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

PaO₂ 70 mmHg (9.3 kPa)FiO₂ 28%

P/F = mmHg

2.Easy

A practice arterial blood gas shows pH 7.56, PaCO₂ 21 mmHg (2.8 kPa) and HCO₃⁻ 18 mmol/L. Which primary disorder is it? Click the cell in the grid.

pH 7.56PaCO₂ 21 mmHg (2.8 kPa)HCO₃⁻ 18 mmol/L

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

3.Medium

Practice values: Na⁺ 147 mmol/L, glucose 7.7 mmol/L and urea 12.1 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.

Na⁺ 147 mmol/Lglucose 7.7 mmol/Lurea 12.1 mmol/L

Osm = mOsm/kg

4.Medium

Practice values: Na⁺ 142 mmol/L, glucose 28.7 mmol/L and urea 10.8 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.

Na⁺ 142 mmol/Lglucose 28.7 mmol/Lurea 10.8 mmol/L

Osm = mOsm/kg

5.Hard

Practice values: Na⁺ 135, Cl⁻ 107, HCO₃⁻ 18 mmol/L and albumin 32 g/L. Find the albumin-corrected anion gap AG_c = AG + 0.25·(40 − albumin).

Na⁺ 135 mmol/LCl⁻ 107 mmol/LHCO₃⁻ 18 mmol/Lalbumin 32 g/L

AG_c = mmol/L

6.Hard

A practice gas shows a metabolic alkalosis with HCO₃⁻ 43 mmol/L. Use expected PaCO₂ = 0.7·HCO₃⁻ + 21 to find the expected PaCO₂.

HCO₃⁻ 43 mmol/L

PaCO₂ = mmHg

Answer key

1. P/F = 250 mmHg
2. respiratory alkalosis
3. Osm = 314 mOsm/kg
4. Osm = 324 mOsm/kg
5. AG_c = 12 mmol/L
6. PaCO₂ = 51.1 mmHg

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