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
1700psiHf = 3.14 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size H oxygen cylinder reads 1700 psi. Its cylinder factor is 3.14 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

1700 psif = 3.14 L/psi200 psi
V = L
2.Easy
500psiDf = 0.16 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size D oxygen cylinder reads 500 psi. Its cylinder factor is 0.16 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

500 psif = 0.16 L/psi200 psi
V = L
3.Medium
PaO₂ 100 mmHg · FiO₂ 0.3 · PEEP 12 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 100 mmHg (13.3 kPa) on 30% oxygen with a PEEP of 12 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 100 mmHg (13.3 kPa)FiO₂ 30%PEEP 12 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
60 s410 mLf = 11/min · V̇A = ?VD​ = 140 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 11 times a minute with a tidal volume of 410 mL. The anatomical dead space is 140 mL. Find the alveolar ventilation V̇A in L/min.

VT 410 mL11/minVD 140 mL
V̇A = L/min
5.Hard
104 kg165 cm♂6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 165 cm tall and weighs 104 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.

165 cm104 kg6 mL/kg
VT = mL
6.Hard
1400psiEf = 0.28 L/psi75 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 75 minutes. The size E cylinder (factor 0.28 L/psi) reads 1400 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

75 min1400 psif = 0.28 L/psi200 psi
Q = L/min

Answer key

  1. 1. V = 4710 L
  2. 2. V = 48 L
  3. 3. above 300: no ARDS grade
  4. 4. V̇A = 2.97 L/min
  5. 5. VT = 369 mL
  6. 6. Q = 4 L/min

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