What is the normal blood oxygen saturation level?

Normal blood oxygen saturation is divided into arterial oxygen saturation and venous oxygen saturation. The arterial oxygen saturation in a healthy human body should be between 95% and 98%. Venous oxygen saturation varies among different organs and generally falls within a normal range of 64% to 88%. If abnormalities are detected, timely medical consultation is recommended. Detailed explanations are as follows:

The normal range of arterial oxygen saturation is typically between 95% and 98%. This indicator is crucial for assessing the body's oxygenation status, reflecting the percentage of oxygenated hemoglobin relative to the total hemoglobin capacity available for binding. In other words, it indicates the concentration of oxygen in the blood. When arterial oxygen saturation falls below the normal range, it may indicate that various tissues and organs in the body are not receiving sufficient oxygen supply, which can affect their normal physiological functions and metabolic demands.

The normal range of venous oxygen saturation varies depending on the organ but is generally between 64% and 88%. Venous oxygen saturation refers to the degree to which hemoglobin in venous blood is bound to oxygen. Since venous blood has already passed through the body's tissues and organs and released most of its oxygen, its oxygen saturation is usually lower than that of arterial blood.

In daily life, it is important to maintain a healthy lifestyle, improve dietary habits, engage in appropriate physical exercise, enhance physical fitness, and reduce the risk of illness.