What is the normal range for arterial oxygen partial pressure (PaO2)?

What is the normal range for arterial oxygen partial pressure (PaO2)?

• A. 50-75 mmHg
• B. 60-80 mmHg
• C. 75-100 mmHg
• D. 90-120 mmHg

Answer: (C)

The normal range for arterial oxygen partial pressure (PaO2) is widely accepted to be between 75 and 100 mmHg. This range indicates an adequate level of oxygenation in the blood, which is crucial for ensuring that tissues receive sufficient oxygen for metabolic processes. PaO2 levels falling within this range suggest that the respiratory system is functioning properly in facilitating gas exchange in the lungs, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled. PaO2 below 75 mmHg is often indicative of hypoxemia, which can lead to various clinical symptoms and conditions such as shortness of breath, increased heart rate, and, over time, potential organ dysfunction due to low oxygen delivery. Conversely, levels above 100 mmHg may occur in certain clinical scenarios but can also raise concerns about oxygen toxicity, especially in patients receiving supplemental oxygen at higher concentrations. In summary, the selection of the range 75-100 mmHg aligns with established guidelines regarding optimal arterial oxygen levels, ensuring effective oxygen delivery to tissues while avoiding the risks associated with both low and excessively high levels.

The normal range for arterial oxygen partial pressure (PaO2) is widely accepted to be between 75 and 100 mmHg. This range indicates an adequate level of oxygenation in the blood, which is crucial for ensuring that tissues receive sufficient oxygen for metabolic processes. PaO2 levels falling within this range suggest that the respiratory system is functioning properly in facilitating gas exchange in the lungs, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled.

PaO2 below 75 mmHg is often indicative of hypoxemia, which can lead to various clinical symptoms and conditions such as shortness of breath, increased heart rate, and, over time, potential organ dysfunction due to low oxygen delivery. Conversely, levels above 100 mmHg may occur in certain clinical scenarios but can also raise concerns about oxygen toxicity, especially in patients receiving supplemental oxygen at higher concentrations.

In summary, the selection of the range 75-100 mmHg aligns with established guidelines regarding optimal arterial oxygen levels, ensuring effective oxygen delivery to tissues while avoiding the risks associated with both low and excessively high levels.