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 6 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

6 L/min
FiO₂ = %
2.Easy
60 s440 mLf = 13/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 13 times a minute with a tidal volume of 440 mL. Find the minute ventilation V̇E in L/min.

VT 440 mL13/min
V̇E = L/min
3.Medium
60 s440 mLf = 10/min · V̇A = ?VD​ = 150 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 10 times a minute with a tidal volume of 440 mL. The anatomical dead space is 150 mL. Find the alveolar ventilation V̇A in L/min.

VT 440 mL10/minVD 150 mL
V̇A = L/min
4.Medium
500psiEf = 0.28 L/psi8 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 500 psi and runs at 8 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

500 psif = 0.28 L/psi8 L/min200 psi
t = min
5.Hard
105 kg186 cm♂4 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 186 cm tall and weighs 105 kg. Lung-protective ventilation is set at 4 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.

186 cm105 kg4 mL/kg
VT = mL
6.Hard
1000psiDf = 0.16 L/psi20 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 20 minutes. The size D cylinder (factor 0.16 L/psi) reads 1000 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

20 min1000 psif = 0.16 L/psi200 psi
Q = L/min

Answer key

  1. 1. FiO₂ = 45 %
  2. 2. V̇E = 5.72 L/min
  3. 3. V̇A = 2.9 L/min
  4. 4. t = 10 min
  5. 5. VT = 322 mL
  6. 6. Q = 6 L/min

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