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 s530 mLf = 25/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 25 times a minute with a tidal volume of 530 mL. Find the minute ventilation V̇E in L/min.

VT 530 mL25/min
V̇E = L/min
2.Easy
1350psiHf = 3.14 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size H oxygen cylinder reads 1350 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?

1350 psif = 3.14 L/psi200 psi
V = L
3.Medium
PaO₂ 66 mmHg · FiO₂ 0.3 · 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 30% oxygen with a PEEP of 6 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 66 mmHg (8.8 kPa)FiO₂ 30%PEEP 6 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
Hb127 g/LSaO₂86%PaO₂52 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 127 g/L, SaO₂ 86% and PaO₂ 52 mmHg (6.9 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 127 g/LSaO₂ 86%PaO₂ 52 mmHg (6.9 kPa)
CaO₂ = mL/dL
5.Hard
2150psiDf = 0.16 L/psi90 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 90 minutes. The size D cylinder (factor 0.16 L/psi) reads 2150 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

90 min2150 psif = 0.16 L/psi200 psi
Q = L/min
6.Hard
1550psiEf = 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 1550 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 min1550 psif = 0.28 L/psi200 psi
Q = L/min

Answer key

  1. 1. V̇E = 13.25 L/min
  2. 2. V = 3611 L
  3. 3. mild
  4. 4. CaO₂ = 14.79 mL/dL
  5. 5. Q = 3 L/min
  6. 6. Q = 5 L/min

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