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What is the normal range of blood oxygen in the human body?

Feb 06, 2025 Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Blood oxygen usually refers to blood oxygen saturation, which is typically divided into arterial oxygen saturation and venous oxygen saturation. The normal range for arterial oxygen saturation is 95% to 98%, while the normal range for venous oxygen saturation is 64% to 88%. When measuring blood oxygen saturation, it is important to ensure correct operation, appropriate measurement site selection, and to avoid factors that may affect the measurement results, such as ambient light and nail polish color.

　　Blood oxygen usually refers to blood oxygen saturation, which is typically 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. Detailed analysis is as follows:

　　Arterial blood oxygen saturation refers to the percentage of oxygenated hemoglobin in arterial blood, reflecting the efficiency of oxygen exchange in the lungs. Under normal conditions, the range of arterial blood oxygen saturation is between 95% and 98%. This value indicates sufficient oxygen supply in the blood 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 refers to the percentage of oxygenated hemoglobin in venous blood, reflecting the utilization of oxygen by tissues. The normal range for venous blood oxygen saturation is broader, typically between 64% and 88%. This value indicates that after tissues have taken up oxygen, a certain amount of oxygen remains in the blood. If venous blood oxygen saturation is too low, it may suggest inadequate oxygen supply to tissues or increased oxygen consumption, commonly seen in conditions such as heart failure, shock, or severe infections.

　　When measuring blood oxygen saturation, it is important to ensure the accuracy and reliability of the measuring device, confirm correct operation, appropriate measurement site, and avoid interference factors such as ambient light and nail color that may affect the measurement results.

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