Compute the PaO2/FiO2 ratio for PaO2 60 mmHg and FiO2 0.50.

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Multiple Choice

Compute the PaO2/FiO2 ratio for PaO2 60 mmHg and FiO2 0.50.

PaO2/FiO2 shows how effectively the lungs transfer oxygen into the blood by relating the arterial oxygen pressure to the fraction of inspired oxygen. Here, you divide PaO2 by FiO2: 60 mmHg ÷ 0.50 = 120. So the PaO2/FiO2 ratio is 120 (dimensionless). This ratio helps gauge oxygenation relative to how much oxygen is being provided; a lower value indicates poorer oxygenation given the same FiO2.

PaO2/FiO2 shows how effectively the lungs transfer oxygen into the blood by relating the arterial oxygen pressure to the fraction of inspired oxygen. Here, you divide PaO2 by FiO2: 60 mmHg ÷ 0.50 = 120. So the PaO2/FiO2 ratio is 120 (dimensionless). This ratio helps gauge oxygenation relative to how much oxygen is being provided; a lower value indicates poorer oxygenation given the same FiO2.

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