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
60 s610 mLf = 25/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 25 times a minute with a tidal volume of 610 mL. Find the minute ventilation V̇E in L/min.

VT 610 mL25/min
V̇E = L/min
2.Easy
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 3 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

3 L/min
FiO₂ = %
3.Medium
60 s340 mLf = 17/min · V̇A = ?VD​ = 180 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 17 times a minute with a tidal volume of 340 mL. The anatomical dead space is 180 mL. Find the alveolar ventilation V̇A in L/min.

VT 340 mL17/minVD 180 mL
V̇A = L/min
4.Medium
1600psiHf = 3.14 L/psi6 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size H oxygen cylinder (factor 3.14 L/psi) reads 1600 psi and runs at 6 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1600 psif = 3.14 L/psi6 L/min200 psi
t = min
5.Hard
1350psiEf = 0.28 L/psi60 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 60 minutes. The size E cylinder (factor 0.28 L/psi) reads 1350 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

60 min1350 psif = 0.28 L/psi200 psi
Q = L/min
6.Hard
700psiDf = 0.16 L/psi60 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 60 minutes. The size D cylinder (factor 0.16 L/psi) reads 700 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

60 min700 psif = 0.16 L/psi200 psi
Q = L/min

Answer key

  1. 1. V̇E = 15.25 L/min
  2. 2. FiO₂ = 33 %
  3. 3. V̇A = 2.72 L/min
  4. 4. t = 732 min
  5. 5. Q = 5 L/min
  6. 6. Q = 1 L/min

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