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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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
60 s320 mLf = 15/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 15 times a minute with a tidal volume of 320 mL. Find the minute ventilation V̇E in L/min.

VT 320 mL15/min
V̇E = L/min
3.Medium
500psiEf = 0.28 L/psi8 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 500 psi and runs at 8 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

500 psif = 0.28 L/psi8 L/min200 psi
t = min
4.Medium
60 s690 mLf = 26/min · V̇A = ?VD​ = 120 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 26 times a minute with a tidal volume of 690 mL. The anatomical dead space is 120 mL. Find the alveolar ventilation V̇A in L/min.

VT 690 mL26/minVD 120 mL
V̇A = L/min
5.Hard
Hb139 g/LSaO₂97%PaO₂95 mmHgCaO₂mL/dL× CO7.1 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 139 g/L, SaO₂ 97%, PaO₂ 95 mmHg (12.7 kPa) and a cardiac output of 7.1 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 139 g/LSaO₂ 97%PaO₂ 95 mmHg (12.7 kPa)CO 7.1 L/min
DO₂ = mL/min
6.Hard
Hb91 g/LSaO₂98%PaO₂101 mmHgCaO₂mL/dL× CO5.2 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 91 g/L, SaO₂ 98%, PaO₂ 101 mmHg (13.5 kPa) and a cardiac output of 5.2 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 91 g/LSaO₂ 98%PaO₂ 101 mmHg (13.5 kPa)CO 5.2 L/min
DO₂ = mL/min

Answer key

  1. 1. FiO₂ = 25 %
  2. 2. V̇E = 4.8 L/min
  3. 3. t = 10 min
  4. 4. V̇A = 14.82 L/min
  5. 5. DO₂ = 1303 mL/min
  6. 6. DO₂ = 637.2 mL/min

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