Hyperoxemia is present when Pao2 is greater than what value?

Hyperoxemia is defined as an excess of oxygen in the tissues and the blood, specifically when arterial partial pressure of oxygen (PaO2) exceeds normal levels. The typical upper limit of normal for PaO2 is around 80 to 100 mm Hg at sea level. Values above this range can lead to hyperoxic conditions, particularly at levels surpassing 100 mm Hg.

When the PaO2 is greater than 100 mm Hg, it indicates an elevated amount of oxygen in the bloodstream, which can be harmful due to potential oxygen toxicity and oxidative stress. Such conditions are particularly significant in patients receiving supplemental oxygen, who might experience levels above this threshold.

Given this understanding, the option that correctly identifies the threshold for hyperoxemia is when PaO2 exceeds 100 mm Hg.