Normal PaO2/FiO2 (P/F) ratio is typically in which range?

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Multiple Choice

Normal PaO2/FiO2 (P/F) ratio is typically in which range?

Explanation:
The P/F ratio shows how well oxygen moves from the air into the blood, so it’s a measure of oxygenation efficiency. In a healthy person on room air, the inspired oxygen fraction (FiO2) is about 0.21 and the arterial oxygen partial pressure (PaO2) is around 95 mmHg. Dividing 95 by 0.21 gives roughly 450, which places the normal range around 400–500. That’s why the 400–500 range best fits normal oxygenation. This ratio helps clinicians gauge how well the lungs are transferring oxygen; higher values indicate better oxygenation, while lower values point to impaired oxygen transfer.

The P/F ratio shows how well oxygen moves from the air into the blood, so it’s a measure of oxygenation efficiency. In a healthy person on room air, the inspired oxygen fraction (FiO2) is about 0.21 and the arterial oxygen partial pressure (PaO2) is around 95 mmHg. Dividing 95 by 0.21 gives roughly 450, which places the normal range around 400–500. That’s why the 400–500 range best fits normal oxygenation. This ratio helps clinicians gauge how well the lungs are transferring oxygen; higher values indicate better oxygenation, while lower values point to impaired oxygen transfer.

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