What is the normal range for blood oxygen?

Feb 06, 2025 Source: Cainiu Health

Dr. Tian Hongbo

Introduction

Blood oxygen refers to blood oxygen saturation, which is 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 blood oxygen saturation remains consistently below the normal range, prompt medical attention is advised, and further examination and treatment should be conducted according to the doctor's recommendations.

Blood oxygen refers to blood oxygen saturation, which is 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%. If abnormalities are detected, timely medical consultation is recommended. Detailed analysis is as follows:

Arterial 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%. Generally, an arterial oxygen saturation above 95% indicates sufficient oxygen supply, adequate to meet the needs of various organs and tissues in the body. If arterial oxygen saturation falls below 95%, it may indicate hypoxia, and further investigation is needed to determine the cause.

Venous oxygen saturation reflects the utilization of oxygen by tissues, with a normal range of 64% to 88%. Measurement of venous oxygen saturation typically requires blood sampling via a central venous catheter, which is an invasive procedure. A decrease in venous oxygen saturation may indicate insufficient oxygen supply to tissues or increased oxygen consumption, commonly seen in conditions such as heart failure, shock, or severe infection.

When measuring blood oxygen saturation, it is important to ensure the accuracy and reliability of the measuring device and to follow the correct measurement methods to obtain accurate results. If blood oxygen saturation remains below the normal range or is accompanied by symptoms such as difficulty breathing, fatigue, or other discomforts, prompt medical attention is advised, and further investigation and treatment should be conducted according to the physician's recommendations.

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