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
60 s570 mLf = 30/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 30 times a minute with a tidal volume of 570 mL. Find the minute ventilation V̇E in L/min.

VT 570 mL30/min
V̇E = L/min
2.Easy
60 s730 mLf = 15/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 15 times a minute with a tidal volume of 730 mL. Find the minute ventilation V̇E in L/min.

VT 730 mL15/min
V̇E = L/min
3.Medium
1800psiHf = 3.14 L/psi15 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size H oxygen cylinder (factor 3.14 L/psi) reads 1800 psi and runs at 15 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1800 psif = 3.14 L/psi15 L/min200 psi
t = min
4.Medium
1750psiHf = 3.14 L/psi6 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size H oxygen cylinder (factor 3.14 L/psi) reads 1750 psi and runs at 6 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1750 psif = 3.14 L/psi6 L/min200 psi
t = min
5.Hard
SpO₂ 89% · FiO₂ 0.9ROX = ?RR 38/minROX = (SpO₂/FiO₂)/RR

Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 89% on FiO₂ 0.9 and a respiratory rate of 38/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.

SpO₂ 89%FiO₂ 0.9RR 38/min
ROX =
6.Hard
Hb95 g/LSaO₂95%PaO₂76 mmHgCaO₂mL/dL× CO5.3 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 95 g/L, SaO₂ 95%, PaO₂ 76 mmHg (10.1 kPa) and a cardiac output of 5.3 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 95 g/LSaO₂ 95%PaO₂ 76 mmHg (10.1 kPa)CO 5.3 L/min
DO₂ = mL/min

Answer key

  1. 1. V̇E = 17.1 L/min
  2. 2. V̇E = 10.95 L/min
  3. 3. t = 334 min
  4. 4. t = 811 min
  5. 5. ROX = 2.6
  6. 6. DO₂ = 653 mL/min

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