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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Name: ____________________   Date: ____________

1.Easy

A practice blood gas shows PaO₂ 58 mmHg (7.7 kPa) while the inspired oxygen is 60%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

PaO₂ 58 mmHg (7.7 kPa)FiO₂ 60%
P/F = mmHg
2.Easy
pH7.357.457.28PaCO₂mmHg354531HCO₃⁻mmol/L222614respiratorymetabolicacidosisalkalosis

A practice arterial blood gas shows pH 7.28, PaCO₂ 31 mmHg (4.1 kPa) and HCO₃⁻ 14 mmol/L. Which primary disorder is it? Click the cell in the grid.

pH 7.28PaCO₂ 31 mmHg (4.1 kPa)HCO₃⁻ 14 mmol/L
  1. 1respiratory acidosis
  2. 2metabolic acidosis
  3. 3respiratory alkalosis
  4. 4metabolic alkalosis
3.Medium
pH7.357.457.51PaCO₂mmHg354549HCO₃⁻mmol/L222638uncompensatedpartially compensatedfully compensated

A practice arterial blood gas shows pH 7.51, PaCO₂ 49 mmHg (6.5 kPa) and HCO₃⁻ 38 mmol/L. The primary disorder is metabolic alkalosis. How far is it compensated? Click your answer.

pH 7.51PaCO₂ 49 mmHg (6.5 kPa)HCO₃⁻ 38 mmol/L
  1. 1uncompensated
  2. 2partially compensated
  3. 3fully compensated
4.Medium

Practice values: Na⁺ 142 mmol/L, glucose 16.6 mmol/L and urea 7.5 mmol/L. Calculate the serum osmolality Osm = 2·Na⁺ + glucose + urea to the nearest whole number.

Na⁺ 142 mmol/Lglucose 16.6 mmol/Lurea 7.5 mmol/L
Osm = mOsm/kg
5.Hard

Practice values: Na⁺ 142, Cl⁻ 113, HCO₃⁻ 11 mmol/L and albumin 29 g/L. Find the albumin-corrected anion gap AGc = AG + 0.25·(40 − albumin).

Na⁺ 142 mmol/LCl⁻ 113 mmol/LHCO₃⁻ 11 mmol/Lalbumin 29 g/L
AGc = mmol/L
6.Hard
pH7.357.457.28PaCO₂mmHg354566HCO₃⁻mmol/L222630acutechronicacute on chronic

A practice gas shows a respiratory acidosis: pH 7.28, PaCO₂ 66 mmHg (8.8 kPa), HCO₃⁻ 30 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 7.28PaCO₂ 66 mmHg (8.8 kPa)HCO₃⁻ 30 mmol/L
  1. 1acute
  2. 2chronic
  3. 3acute on chronic

Answer key

  1. 1. P/F = 96.67 mmHg
  2. 2. metabolic acidosis
  3. 3. partially compensated
  4. 4. Osm = 308 mOsm/kg
  5. 5. AGc = 20.75 mmol/L
  6. 6. acute on chronic

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