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

4 L/min
FiO₂ = %
2.Easy
1700psiEf = 0.28 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size E oxygen cylinder reads 1700 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?

1700 psif = 0.28 L/psi200 psi
V = L
3.Medium
PaO₂ 66 mmHg · FiO₂ 0.7 · PEEP 6 cmH₂O0100200300400500P/F (mmHg)above 300: no ARDS grademildmoderatesevere

Practice exercise (made-up values, not clinical guidance). A ventilated patient who meets the other Berlin criteria for ARDS has PaO₂ 66 mmHg (8.8 kPa) on 70% oxygen with a PEEP of 6 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 66 mmHg (8.8 kPa)FiO₂ 70%PEEP 6 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
PaO₂ 113 mmHg · FiO₂ 0.35 · PEEP 14 cmH₂O0100200300400500P/F (mmHg)above 300: no ARDS grademildmoderatesevere

Practice exercise (made-up values, not clinical guidance). A ventilated patient who meets the other Berlin criteria for ARDS has PaO₂ 113 mmHg (15.1 kPa) on 35% oxygen with a PEEP of 14 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 113 mmHg (15.1 kPa)FiO₂ 35%PEEP 14 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
5.Hard
129 kg192 cm♂6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 192 cm tall and weighs 129 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.

192 cm129 kg6 mL/kg
VT = mL
6.Hard
1350psiDf = 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 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?

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

Answer key

  1. 1. FiO₂ = 37 %
  2. 2. V = 420 L
  3. 3. severe
  4. 4. above 300: no ARDS grade
  5. 5. VT = 516 mL
  6. 6. Q = 4 L/min

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