What is the normal pressure of oxygen (PO2) dissolved in blood?

The normal pressure of oxygen (PO2) dissolved in blood is typically around 80-100 mmHg. This range reflects the partial pressure of oxygen in arterial blood, which is essential for evaluating an individual's oxygenation status. The measurement indicates how well oxygen is able to move from the lungs into the bloodstream and is crucial for the proper functioning of bodily tissues and organs.

In healthy individuals under normal physiological conditions, an arterial PO2 level within this range correlates with adequate oxygenation, supporting cellular metabolism and overall function. When PO2 values fall below this range, it can signify hypoxemia, which may require further investigation or intervention. Conversely, PO2 levels above this range may suggest conditions such as hyperoxia, which could lead to toxic effects on the body.

Understanding this standard range helps healthcare providers assess respiratory function and guide treatment strategies for patients with respiratory illnesses or conditions affecting oxygen delivery.