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.

New worksheet Practise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________ Date: ____________

1.Easy

A practice blood gas shows PaO₂ 93 mmHg (12.4 kPa) while the inspired oxygen is 50%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

PaO₂ 93 mmHg (12.4 kPa)FiO₂ 50%

P/F = mmHg

2.Easy

A practice blood gas shows PaO₂ 70 mmHg (9.3 kPa) while the inspired oxygen is 21%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

PaO₂ 70 mmHg (9.3 kPa)FiO₂ 21%

P/F = mmHg

3.Medium

A practice gas shows a metabolic acidosis with HCO₃⁻ 6 mmol/L. Use Winter’s formula to find the expected PaCO₂ (the centre of the range) in mmHg.

HCO₃⁻ 6 mmol/L

PaCO₂ = mmHg

4.Medium

Practice values: Na⁺ 150 mmol/L, glucose 8.4 mmol/L and urea 10.1 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.

Na⁺ 150 mmol/Lglucose 8.4 mmol/Lurea 10.1 mmol/L

Osm = mOsm/kg

5.Hard

Practice values: Na⁺ 137, Cl⁻ 105, HCO₃⁻ 12 mmol/L and albumin 28 g/L. Find the albumin-corrected anion gap AG_c = AG + 0.25·(40 − albumin).

Na⁺ 137 mmol/LCl⁻ 105 mmol/LHCO₃⁻ 12 mmol/Lalbumin 28 g/L

AG_c = mmol/L

6.Hard

A practice gas shows a respiratory acidosis: pH 7.19, PaCO₂ 73 mmHg (9.7 kPa), HCO₃⁻ 27 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.

pH 7.19PaCO₂ 73 mmHg (9.7 kPa)HCO₃⁻ 27 mmol/L

1acute
2chronic
3acute on chronic

Answer key

1. P/F = 186 mmHg
2. P/F = 333.3 mmHg
3. PaCO₂ = 17 mmHg
4. Osm = 319 mOsm/kg
5. AG_c = 23 mmol/L
6. acute

Full step-by-step solutions: practise this topic on examproblems.com.