Calculate the P/F ratio given PaO2 = 120 mmHg and FiO2 = 0.50.

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Multiple Choice

Calculate the P/F ratio given PaO2 = 120 mmHg and FiO2 = 0.50.

P/F ratio measures how well oxygen is transferring from the lungs into the blood by comparing arterial oxygen pressure to the fraction of inspired oxygen. It is calculated as PaO2 divided by FiO2, with FiO2 expressed as a decimal. Here, PaO2 is 120 mmHg and FiO2 is 0.50, so 120 ÷ 0.50 = 240. The resulting ratio is 240, a value that suggests some oxygenation impairment (normal is typically above 300).

P/F ratio measures how well oxygen is transferring from the lungs into the blood by comparing arterial oxygen pressure to the fraction of inspired oxygen. It is calculated as PaO2 divided by FiO2, with FiO2 expressed as a decimal. Here, PaO2 is 120 mmHg and FiO2 is 0.50, so 120 ÷ 0.50 = 240. The resulting ratio is 240, a value that suggests some oxygenation impairment (normal is typically above 300).

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