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
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

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

4 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
60 s530 mLf = 15/min · V̇A = ?VD​ = 120 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 15 times a minute with a tidal volume of 530 mL. The anatomical dead space is 120 mL. Find the alveolar ventilation V̇A in L/min.

VT 530 mL15/minVD 120 mL
V̇A = L/min
4.Medium
Hb78 g/LSaO₂98%PaO₂107 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 78 g/L, SaO₂ 98% and PaO₂ 107 mmHg (14.3 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 78 g/LSaO₂ 98%PaO₂ 107 mmHg (14.3 kPa)
CaO₂ = mL/dL
5.Hard
Hb156 g/LSaO₂91%PaO₂61 mmHgCaO₂mL/dL× CO3.5 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 156 g/L, SaO₂ 91%, PaO₂ 61 mmHg (8.1 kPa) and a cardiac output of 3.5 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 156 g/LSaO₂ 91%PaO₂ 61 mmHg (8.1 kPa)CO 3.5 L/min
DO₂ = mL/min
6.Hard
SpO₂ 92% · FiO₂ 0.35ROX = ?RR 32/minROX = (SpO₂/FiO₂)/RR

Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 92% on FiO₂ 0.35 and a respiratory rate of 32/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.

SpO₂ 92%FiO₂ 0.35RR 32/min
ROX =

Answer key

  1. 1. FiO₂ = 37 %
  2. 2. FiO₂ = 29 %
  3. 3. V̇A = 6.15 L/min
  4. 4. CaO₂ = 10.56 mL/dL
  5. 5. DO₂ = 672.2 mL/min
  6. 6. ROX = 8.21

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