What is the normal blood oxygen level?

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. Arterial blood oxygen saturation of 95% to 98% is considered normal, while venous blood oxygen saturation of 64% to 88% is considered normal. When measuring blood oxygen saturation, it is important to ensure the accuracy of the measuring device and the correctness of the measurement method.

　　Blood oxygen refers to blood oxygen saturation, which is divided into arterial blood oxygen saturation and venous blood oxygen saturation. Arterial blood oxygen saturation ranging from 95% to 98% is considered normal, while venous blood oxygen saturation between 64% to 88% is considered normal. If abnormalities are detected, timely medical consultation is recommended. Detailed explanations are as follows:

　　Arterial blood is the blood flowing from the heart to the entire body, rich in oxygen, providing necessary oxygen to various tissues. Therefore, arterial blood oxygen saturation is usually high, with a normal range of 95% to 98%, ensuring sufficient oxygen supply to all parts of the body.

　　Venous blood is the blood returning from the body's tissues back to the heart, having already undergone oxygen utilization. Therefore, its oxygen content is relatively lower. Venous blood oxygen saturation is usually lower than arterial blood oxygen saturation, with a normal range of 64% to 88%.

　　The normal reference range for blood oxygen saturation may vary due to individual differences, measurement methods, measuring devices, and physiological or pathological conditions. Therefore, when measuring blood oxygen saturation, it is important to ensure the accuracy of the measuring device and the correctness of the measurement method.

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