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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Name: ____________________   Date: ____________

1.Easy
0123456L/minQ = ? L/minFiO₂ ≈ 45%

Practice exercise (made-up values, not clinical guidance). The team wants an inspired oxygen of about 45% by nasal cannula. Using the rule of thumb FiO₂ ≈ 21% + 4% per L/min, what flow Q does it suggest? (Real FiO₂ varies with the patient's breathing.)

FiO₂ 45%
Q = L/min
2.Easy
60 s660 mLf = 12/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 12 times a minute with a tidal volume of 660 mL. Find the minute ventilation V̇E in L/min.

VT 660 mL12/min
V̇E = L/min
3.Medium
60 s620 mLf = 18/min · V̇A = ?VD​ = 180 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 18 times a minute with a tidal volume of 620 mL. The anatomical dead space is 180 mL. Find the alveolar ventilation V̇A in L/min.

VT 620 mL18/minVD 180 mL
V̇A = L/min
4.Medium
PaO₂ 103 mmHg · FiO₂ 0.4 · PEEP 8 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 103 mmHg (13.7 kPa) on 40% oxygen with a PEEP of 8 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 103 mmHg (13.7 kPa)FiO₂ 40%PEEP 8 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
5.Hard
1950psiDf = 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 1950 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 min1950 psif = 0.16 L/psi200 psi
Q = L/min
6.Hard
1000psiDf = 0.16 L/psi40 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 40 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?

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

Answer key

  1. 1. Q = 6 L/min
  2. 2. V̇E = 7.92 L/min
  3. 3. V̇A = 7.92 L/min
  4. 4. mild
  5. 5. Q = 6 L/min
  6. 6. Q = 3 L/min

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