What is the normal range for PO2 levels in mmHg?

The normal range for arterial PO2 (partial pressure of oxygen) levels in mmHg is considered to be between 80 and 100 mmHg. This range indicates adequate oxygenation in the bloodstream, which is critical for cellular metabolism and overall physiological function.

When PO2 levels fall below 80 mmHg, it may indicate hypoxemia, where there is insufficient oxygen available in the blood to meet metabolic demands. Conversely, levels above 100 mmHg, while sometimes seen in specific clinical situations, are not typically regarded as the norm for healthy individuals at sea level.

Option A (60 - 80 mmHg) does not capture the standard range associated with normal oxygenation levels, as values below 80 mmHg are concerning for hypoxemia. Other choices vary as well, with choice B (80 - 100 mmHg) representing the universally accepted normal range, while choice C (90 - 110 mmHg) crosses above the typical range. Choice D (97 mmHg) is indeed within the normal range but does not encompass the broader standard. Therefore, the most accurate representation for normal arterial PO2 levels is indeed 80 - 100 mmHg, making option B the correct choice.