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 s630 mLf = 11/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 11 times a minute with a tidal volume of 630 mL. Find the minute ventilation V̇E in L/min.

VT 630 mL11/min
V̇E = L/min
2.Easy
60 s340 mLf = 23/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 23 times a minute with a tidal volume of 340 mL. Find the minute ventilation V̇E in L/min.

VT 340 mL23/min
V̇E = L/min
3.Medium
PaO₂ 118 mmHg · FiO₂ 0.3 · PEEP 10 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 118 mmHg (15.7 kPa) on 30% oxygen with a PEEP of 10 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 118 mmHg (15.7 kPa)FiO₂ 30%PEEP 10 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
1350psiEf = 0.28 L/psi10 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 1350 psi and runs at 10 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1350 psif = 0.28 L/psi10 L/min200 psi
t = min
5.Hard
Hb100 g/LSaO₂92%PaO₂64 mmHgCaO₂mL/dL× CO7.2 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 100 g/L, SaO₂ 92%, PaO₂ 64 mmHg (8.5 kPa) and a cardiac output of 7.2 L/min. With CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg), find the oxygen delivery DO₂ = CaO₂ × CO × 10 in mL/min.

Hb 100 g/LSaO₂ 92%PaO₂ 64 mmHg (8.5 kPa)CO 7.2 L/min
DO₂ = mL/min
6.Hard
SpO₂ 89% · FiO₂ 0.45ROX = ?RR 26/minROX = (SpO₂/FiO₂)/RR

Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 89% on FiO₂ 0.45 and a respiratory rate of 26/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.

SpO₂ 89%FiO₂ 0.45RR 26/min
ROX =

Answer key

  1. 1. V̇E = 6.93 L/min
  2. 2. V̇E = 7.82 L/min
  3. 3. above 300: no ARDS grade
  4. 4. t = 32 min
  5. 5. DO₂ = 901.4 mL/min
  6. 6. ROX = 7.61

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