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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 1 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

1 L/min
FiO₂ = %
2.Easy
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 2 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

2 L/min
FiO₂ = %
3.Medium
Hb144 g/LSaO₂88%PaO₂55 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 144 g/L, SaO₂ 88% and PaO₂ 55 mmHg (7.3 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 144 g/LSaO₂ 88%PaO₂ 55 mmHg (7.3 kPa)
CaO₂ = mL/dL
4.Medium
60 s370 mLf = 10/min · V̇A = ?VD​ = 120 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 10 times a minute with a tidal volume of 370 mL. The anatomical dead space is 120 mL. Find the alveolar ventilation V̇A in L/min.

VT 370 mL10/minVD 120 mL
V̇A = L/min
5.Hard
80 kg165 cm♂4 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 165 cm tall and weighs 80 kg. Lung-protective ventilation is set at 4 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 cm80 kg4 mL/kg
VT = mL
6.Hard
PaO₂ 15.2 kPa · FiO₂ 0.35 · PEEP 6 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 15.2 kPa on 35% oxygen with a PEEP of 6 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 15.2 kPaFiO₂ 35%PEEP 6 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5

Answer key

  1. 1. FiO₂ = 25 %
  2. 2. FiO₂ = 29 %
  3. 3. CaO₂ = 17.15 mL/dL
  4. 4. V̇A = 2.5 L/min
  5. 5. VT = 246 mL
  6. 6. above 300: no ARDS grade

Full step-by-step solutions: practise this topic on examproblems.com.