In the P/F ratio calculation PaO2 120 mmHg and FiO2 0.50, what FiO2 value was used?

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Multiple Choice

In the P/F ratio calculation PaO2 120 mmHg and FiO2 0.50, what FiO2 value was used?

The P/F ratio uses the PaO2 divided by the FiO2 present when the arterial gas was measured, so the FiO2 value used is 0.50 (50% oxygen). With PaO2 of 120 mmHg and FiO2 of 0.50, the ratio would be 120 / 0.50 = 240. The other FiO2 values (0.40, 0.60, 0.70) are different oxygen levels and aren’t the ones used for this measurement.

The P/F ratio uses the PaO2 divided by the FiO2 present when the arterial gas was measured, so the FiO2 value used is 0.50 (50% oxygen). With PaO2 of 120 mmHg and FiO2 of 0.50, the ratio would be 120 / 0.50 = 240. The other FiO2 values (0.40, 0.60, 0.70) are different oxygen levels and aren’t the ones used for this measurement.

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