What is the normal range for blood oxygen levels?

Feb 06, 2025 Source: Cainiu Health

Dr. Tian Hongbo

Introduction

Blood oxygen generally refers to blood oxygen saturation, which is normally categorized into arterial oxygen saturation and venous oxygen saturation. The normal range for arterial oxygen saturation is typically between 95% and 98%, while venous oxygen saturation generally ranges from 64% to 88%. When measuring blood oxygen saturation, it is important to use accurate measuring equipment and follow the correct measurement methods.

　　Blood oxygen generally refers to blood oxygen saturation, which is normally categorized into arterial oxygen saturation and venous oxygen saturation. The normal range of arterial oxygen saturation is typically between 95% and 98%, while venous oxygen saturation generally ranges between 64% and 88%. A detailed explanation is as follows:

　　The normal value for arterial oxygen saturation is usually between 95% and 98%. This range indicates the adequacy of oxygen content in the blood. If arterial oxygen saturation falls below 95%, it may indicate hypoxia (oxygen deficiency) in the body, which could be caused by issues with the respiratory or cardiovascular systems. In severe cases, hypoxia can be life-threatening.

　　Venous oxygen saturation typically falls between 64% and 88%. This range is lower than that of arterial oxygen saturation because venous blood has already released part of its oxygen to body tissues during circulation back to the heart. Changes in venous oxygen saturation are usually not as pronounced as those in arterial oxygen saturation. However, under certain pathological conditions, such as lung or heart diseases, venous oxygen saturation may also change.

　　Blood oxygen saturation measurements can be influenced by multiple factors, including the accuracy of the measuring device, the choice of measurement site, and the patient's physical condition. Therefore, when measuring blood oxygen saturation, it is important to use accurate equipment and follow appropriate measurement methods.

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