What is the normal range for arterial PO2 in humans?

The normal range for arterial PO2 (partial pressure of oxygen) in humans is typically recognized as 80-100 mmHg. This range reflects the oxygen available in the blood that is essential for cellular respiration and overall metabolic processes. Maintaining PO2 levels within this range is critical for ensuring that tissues receive adequate oxygen to meet their metabolic needs.

When arterial PO2 falls below this range, it can lead to hypoxemia, affecting various organ systems and potentially leading to health complications. Conversely, excessively high levels of PO2 can occur in specific clinical scenarios but are not typical under normal physiological conditions.

The range of 80-100 mmHg is supported by standard physiological references, which align with the pressures observed in healthy individuals at sea level and without respiratory disorders. This benchmark is used in clinical practice to assess respiratory function and oxygenation status.