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
600psiDf = 0.16 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size D oxygen cylinder reads 600 psi. Its cylinder factor is 0.16 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

600 psif = 0.16 L/psi200 psi
V = L
2.Easy
60 s560 mLf = 9/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 9 times a minute with a tidal volume of 560 mL. Find the minute ventilation V̇E in L/min.

VT 560 mL9/min
V̇E = L/min
3.Medium
60 s330 mLf = 16/min · V̇A = ?VD​ = 160 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 16 times a minute with a tidal volume of 330 mL. The anatomical dead space is 160 mL. Find the alveolar ventilation V̇A in L/min.

VT 330 mL16/minVD 160 mL
V̇A = L/min
4.Medium
1150psiEf = 0.28 L/psi5 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 1150 psi and runs at 5 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1150 psif = 0.28 L/psi5 L/min200 psi
t = min
5.Hard
Hb114 g/LSaO₂98%PaO₂100 mmHgCaO₂mL/dL× CO3.2 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 114 g/L, SaO₂ 98%, PaO₂ 100 mmHg (13.3 kPa) and a cardiac output of 3.2 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 114 g/LSaO₂ 98%PaO₂ 100 mmHg (13.3 kPa)CO 3.2 L/min
DO₂ = mL/min
6.Hard
SpO₂ 89% · FiO₂ 0.5ROX = ?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 0.5 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 0.5RR 26/min
ROX =

Answer key

  1. 1. V = 64 L
  2. 2. V̇E = 5.04 L/min
  3. 3. V̇A = 2.72 L/min
  4. 4. t = 53 min
  5. 5. DO₂ = 488.7 mL/min
  6. 6. ROX = 6.85

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