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 s730 mLf = 21/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 21 times a minute with a tidal volume of 730 mL. Find the minute ventilation V̇E in L/min.

VT 730 mL21/min
V̇E = L/min
2.Easy
60 s420 mLf = 19/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 19 times a minute with a tidal volume of 420 mL. Find the minute ventilation V̇E in L/min.

VT 420 mL19/min
V̇E = L/min
3.Medium
PaO₂ 51 mmHg · FiO₂ 0.7 · 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 51 mmHg (6.8 kPa) on 70% oxygen with a PEEP of 10 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 51 mmHg (6.8 kPa)FiO₂ 70%PEEP 10 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
Hb107 g/LSaO₂97%PaO₂94 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 107 g/L, SaO₂ 97% and PaO₂ 94 mmHg (12.5 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 107 g/LSaO₂ 97%PaO₂ 94 mmHg (12.5 kPa)
CaO₂ = mL/dL
5.Hard
SpO₂ 88% · FiO₂ 0.3ROX = ?RR 21/minROX = (SpO₂/FiO₂)/RR

Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 88% on FiO₂ 0.3 and a respiratory rate of 21/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.

SpO₂ 88%FiO₂ 0.3RR 21/min
ROX =
6.Hard
PaO₂ 14.5 kPa · FiO₂ 0.45 · PEEP 12 cmH₂O0100200300400500P/F (mmHg)above 300: no ARDS grademildmoderateseverenot gradable: PEEP below 5

Practice exercise (made-up values, not clinical guidance). A patient with acute hypoxaemia and bilateral opacities, not explained by heart failure, has PaO₂ 14.5 kPa on 45% oxygen with a PEEP of 12 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 14.5 kPaFiO₂ 45%PEEP 12 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5

Answer key

  1. 1. V̇E = 15.33 L/min
  2. 2. V̇E = 7.98 L/min
  3. 3. severe
  4. 4. CaO₂ = 14.19 mL/dL
  5. 5. ROX = 13.97
  6. 6. mild

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