PaO2/FiO2 ratio: PaO2 = 100 mmHg, FiO2 = 0.50. What is PaO2/FiO2?

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Multiple Choice

PaO2/FiO2 ratio: PaO2 = 100 mmHg, FiO2 = 0.50. What is PaO2/FiO2?

PaO2/FiO2 ratio measures how well the lungs transfer oxygen by comparing arterial oxygen tension to the fraction of inspired oxygen. Use PaO2 divided by FiO2 (as a decimal). With PaO2 = 100 mmHg and FiO2 = 0.50, calculate 100 ÷ 0.50 = 200. So the ratio is 200. This value helps gauge oxygenation efficiency (normal is typically around >300; lower values indicate impaired oxygenation).

PaO2/FiO2 ratio measures how well the lungs transfer oxygen by comparing arterial oxygen tension to the fraction of inspired oxygen. Use PaO2 divided by FiO2 (as a decimal). With PaO2 = 100 mmHg and FiO2 = 0.50, calculate 100 ÷ 0.50 = 200. So the ratio is 200. This value helps gauge oxygenation efficiency (normal is typically around >300; lower values indicate impaired oxygenation).

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