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 91 mmHg (12.1 kPa) while the inspired oxygen is 50%. Calculate the ratio P/F = PaO₂/FiO₂ in mmHg.

PaO₂ 91 mmHg (12.1 kPa)FiO₂ 50%
P/F = mmHg
2.Easy
pH7.357.457.53PaCO₂mmHg354520HCO₃⁻mmol/L222616respiratorymetabolicacidosisalkalosis

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
  1. 1respiratory acidosis
  2. 2metabolic acidosis
  3. 3respiratory alkalosis
  4. 4metabolic alkalosis
3.Medium
pH7.357.457.55PaCO₂mmHg354549HCO₃⁻mmol/L222641uncompensatedpartially compensatedfully compensated

A practice arterial blood gas shows pH 7.55, PaCO₂ 49 mmHg (6.5 kPa) and HCO₃⁻ 41 mmol/L. The primary disorder is metabolic alkalosis. How far is it compensated? Click your answer.

pH 7.55PaCO₂ 49 mmHg (6.5 kPa)HCO₃⁻ 41 mmol/L
  1. 1uncompensated
  2. 2partially compensated
  3. 3fully compensated
4.Medium
pH7.357.457.32PaCO₂mmHg354562HCO₃⁻mmol/L222631uncompensatedpartially compensatedfully compensated

A practice arterial blood gas shows pH 7.32, PaCO₂ 62 mmHg (8.3 kPa) and HCO₃⁻ 31 mmol/L. The primary disorder is respiratory acidosis. How far is it compensated? Click your answer.

pH 7.32PaCO₂ 62 mmHg (8.3 kPa)HCO₃⁻ 31 mmol/L
  1. 1uncompensated
  2. 2partially compensated
  3. 3fully compensated
5.Hard

At sea level, a practice gas taken on 30% oxygen shows PaO₂ 79 mmHg (10.5 kPa) and PaCO₂ 30 mmHg (4.0 kPa). Use PAO₂ = FiO₂·(760 − 47) − PaCO₂/0.8 to find the A–a gradient.

FiO₂ 30%PaO₂ 79 mmHg (10.5 kPa)PaCO₂ 30 mmHg (4.0 kPa)
A–a gradient = mmHg
6.Hard
pH7.357.457.33PaCO₂mmHg354535HCO₃⁻mmol/L222618added normal-gap acidosispure high-gap acidosisadded metabolic alkalosis

A practice gas shows pH 7.33, PaCO₂ 35 mmHg (4.7 kPa) and HCO₃⁻ 18 mmol/L, with Na⁺ 146 and Cl⁻ 100 mmol/L. Use the anion gap and the delta ratio to click the best interpretation.

pH 7.33PaCO₂ 35 mmHg (4.7 kPa)HCO₃⁻ 18 mmol/LNa⁺ 146 mmol/LCl⁻ 100 mmol/L
  1. 1added normal-gap acidosis
  2. 2pure high-gap acidosis
  3. 3added metabolic alkalosis

Answer key

  1. 1. P/F = 182 mmHg
  2. 2. respiratory alkalosis
  3. 3. partially compensated
  4. 4. partially compensated
  5. 5. A–a gradient = 97.4 mmHg
  6. 6. added metabolic alkalosis

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