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
1350psiHf = 3.14 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size H oxygen cylinder reads 1350 psi. Its cylinder factor is 3.14 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

1350 psif = 3.14 L/psi200 psi
V = L
2.Easy
0123456L/minQ = ? L/minFiO₂ ≈ 25%

Practice exercise (made-up values, not clinical guidance). The team wants an inspired oxygen of about 25% by nasal cannula. Using the rule of thumb FiO₂ ≈ 21% + 4% per L/min, what flow Q does it suggest? (Real FiO₂ varies with the patient's breathing.)

FiO₂ 25%
Q = L/min
3.Medium
60 s360 mLf = 24/min · V̇A = ?VD​ = 150 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 24 times a minute with a tidal volume of 360 mL. The anatomical dead space is 150 mL. Find the alveolar ventilation V̇A in L/min.

VT 360 mL24/minVD 150 mL
V̇A = L/min
4.Medium
60 s630 mLf = 17/min · V̇A = ?VD​ = 140 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 17 times a minute with a tidal volume of 630 mL. The anatomical dead space is 140 mL. Find the alveolar ventilation V̇A in L/min.

VT 630 mL17/minVD 140 mL
V̇A = L/min
5.Hard
91 kg174 cm♂6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated man is 174 cm tall and weighs 91 kg. Lung-protective ventilation is set at 6 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.

174 cm91 kg6 mL/kg
VT = mL
6.Hard
80 kg165 cm♂6 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 6 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 kg6 mL/kg
VT = mL

Answer key

  1. 1. V = 3611 L
  2. 2. Q = 1 L/min
  3. 3. V̇A = 5.04 L/min
  4. 4. V̇A = 8.33 L/min
  5. 5. VT = 418 mL
  6. 6. VT = 369 mL

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