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 s450 mLf = 15/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 15 times a minute with a tidal volume of 450 mL. Find the minute ventilation V̇E in L/min.

VT 450 mL15/min
V̇E = L/min
2.Easy
900psiEf = 0.28 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size E oxygen cylinder reads 900 psi. Its cylinder factor is 0.28 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

900 psif = 0.28 L/psi200 psi
V = L
3.Medium
Hb96 g/LSaO₂94%PaO₂73 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 96 g/L, SaO₂ 94% and PaO₂ 73 mmHg (9.7 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 96 g/LSaO₂ 94%PaO₂ 73 mmHg (9.7 kPa)
CaO₂ = mL/dL
4.Medium
1100psiDf = 0.16 L/psi10 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size D oxygen cylinder (factor 0.16 L/psi) reads 1100 psi and runs at 10 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1100 psif = 0.16 L/psi10 L/min200 psi
t = min
5.Hard
89 kg160 cm♀6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated woman is 160 cm tall and weighs 89 kg. Lung-protective ventilation is set at 6 mL per kg of predicted body weight. Using PBW = 45.5 + 0.91 × (height cm − 152.4) kg, find the tidal volume VT to the nearest mL.

160 cm89 kg6 mL/kg
VT = mL
6.Hard
1350psiDf = 0.16 L/psi120 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 120 minutes. The size D cylinder (factor 0.16 L/psi) reads 1350 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

120 min1350 psif = 0.16 L/psi200 psi
Q = L/min

Answer key

  1. 1. V̇E = 6.75 L/min
  2. 2. V = 196 L
  3. 3. CaO₂ = 12.31 mL/dL
  4. 4. t = 14 min
  5. 5. VT = 314 mL
  6. 6. Q = 1 L/min

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