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 s700 mLf = 21/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 21 times a minute with a tidal volume of 700 mL. Find the minute ventilation V̇E in L/min.

VT 700 mL21/min
V̇E = L/min
2.Easy
60 s530 mLf = 32/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 32 times a minute with a tidal volume of 530 mL. Find the minute ventilation V̇E in L/min.

VT 530 mL32/min
V̇E = L/min
3.Medium
1800psiDf = 0.16 L/psi5 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size D oxygen cylinder (factor 0.16 L/psi) reads 1800 psi and runs at 5 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1800 psif = 0.16 L/psi5 L/min200 psi
t = min
4.Medium
Hb131 g/LSaO₂97%PaO₂91 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 131 g/L, SaO₂ 97% and PaO₂ 91 mmHg (12.1 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 131 g/LSaO₂ 97%PaO₂ 91 mmHg (12.1 kPa)
CaO₂ = mL/dL
5.Hard
2100psiDf = 0.16 L/psi45 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 45 minutes. The size D cylinder (factor 0.16 L/psi) reads 2100 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

45 min2100 psif = 0.16 L/psi200 psi
Q = L/min
6.Hard
Hb77 g/LSaO₂97%PaO₂91 mmHgCaO₂mL/dL× CO3.7 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 77 g/L, SaO₂ 97%, PaO₂ 91 mmHg (12.1 kPa) and a cardiac output of 3.7 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 77 g/LSaO₂ 97%PaO₂ 91 mmHg (12.1 kPa)CO 3.7 L/min
DO₂ = mL/min

Answer key

  1. 1. V̇E = 14.7 L/min
  2. 2. V̇E = 16.96 L/min
  3. 3. t = 51 min
  4. 4. CaO₂ = 17.3 mL/dL
  5. 5. Q = 6 L/min
  6. 6. DO₂ = 380.4 mL/min

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