PaO2 normal range is:

PaO2 normal range is:

• A. 80-100
• B. 60-80
• C. 100-120
• D. 40-60

Answer: (A)

PaO2 measures the amount of oxygen dissolved in arterial blood, reflecting how effectively oxygen moves from the lungs into the bloodstream. In a healthy adult breathing room air at sea level, PaO2 is normally about 80–100 mmHg. This range indicates adequate oxygenation to tissues. Values below 80 mmHg signal hypoxemia and prompt evaluation of lung function, ventilation-perfusion, diffusion, or oxygen delivery issues. PaO2 above 100 mmHg can occur with supplemental oxygen and isn’t typically a concern in the short term, though prolonged hyperoxia has its own risks. Thus, 80–100 mmHg is the standard normal range.

PaO2 measures the amount of oxygen dissolved in arterial blood, reflecting how effectively oxygen moves from the lungs into the bloodstream. In a healthy adult breathing room air at sea level, PaO2 is normally about 80–100 mmHg. This range indicates adequate oxygenation to tissues. Values below 80 mmHg signal hypoxemia and prompt evaluation of lung function, ventilation-perfusion, diffusion, or oxygen delivery issues. PaO2 above 100 mmHg can occur with supplemental oxygen and isn’t typically a concern in the short term, though prolonged hyperoxia has its own risks. Thus, 80–100 mmHg is the standard normal range.