What is the normal range for blood oxygen levels?

Blood oxygen, or blood oxygen saturation, can be divided into arterial blood oxygen saturation and venous blood oxygen saturation. The normal range for arterial blood oxygen saturation is 95% to 98%, while the normal range for venous blood oxygen saturation is 64% to 88%. If abnormalities are detected, timely medical consultation is recommended. A detailed explanation is as follows:

Arterial blood oxygen saturation reflects the efficiency of oxygen exchange in the lungs and the circulatory system's ability to supply oxygen. The normal range is 95% to 98%. An arterial blood oxygen saturation above 95% indicates sufficient oxygen supply, adequate to meet the needs of various organs and tissues in the body. If arterial blood oxygen saturation falls below 95%, it may indicate hypoxia, and further investigation is needed to determine the cause.

Venous blood oxygen saturation reflects the utilization of oxygen by tissues, with a normal range of 64% to 88%. A decrease in venous blood oxygen saturation may indicate inadequate oxygen supply to tissues or increased oxygen consumption, commonly seen in conditions such as heart failure, shock, or severe infection. Therefore, monitoring of venous blood oxygen saturation is often used in the management of critically ill patients and can assist physicians in assessing the overall balance between oxygen supply and demand in the body.

In daily life, maintaining a healthy lifestyle, improving dietary habits, and engaging in appropriate physical exercise can help improve blood oxygen saturation and enhance physical fitness.