Oxygen therapy & respiratory calculations worksheet with answers

Free printable Oxygen therapy & respiratory calculations 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
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 5 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

5 L/min
FiO₂ = %
2.Easy
60 s600 mLf = 22/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 22 times a minute with a tidal volume of 600 mL. Find the minute ventilation V̇E in L/min.

VT 600 mL22/min
V̇E = L/min
3.Medium
Hb101 g/LSaO₂96%PaO₂85 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 101 g/L, SaO₂ 96% and PaO₂ 85 mmHg (11.3 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 101 g/LSaO₂ 96%PaO₂ 85 mmHg (11.3 kPa)
CaO₂ = mL/dL
4.Medium
60 s330 mLf = 21/min · V̇A = ?VD​ = 150 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 21 times a minute with a tidal volume of 330 mL. The anatomical dead space is 150 mL. Find the alveolar ventilation V̇A in L/min.

VT 330 mL21/minVD 150 mL
V̇A = L/min
5.Hard
Hb159 g/LSaO₂95%PaO₂75 mmHgCaO₂mL/dL× CO6.1 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 159 g/L, SaO₂ 95%, PaO₂ 75 mmHg (10.0 kPa) and a cardiac output of 6.1 L/min. With CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg), find the oxygen delivery DO₂ = CaO₂ × CO × 10 in mL/min.

Hb 159 g/LSaO₂ 95%PaO₂ 75 mmHg (10.0 kPa)CO 6.1 L/min
DO₂ = mL/min
6.Hard
91 kg174 cm♂6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 174 cm tall and weighs 91 kg. Lung-protective ventilation is set at 6 mL per kg of predicted body weight. Using PBW = 50 + 0.91 × (height cm − 152.4) kg, find the tidal volume VT to the nearest mL.

174 cm91 kg6 mL/kg
VT = mL

Answer key

  1. 1. FiO₂ = 41 %
  2. 2. V̇E = 13.2 L/min
  3. 3. CaO₂ = 13.25 mL/dL
  4. 4. V̇A = 3.78 L/min
  5. 5. DO₂ = 1248 mL/min
  6. 6. VT = 418 mL

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