What does blood oxygen mean?

Feb 06, 2025 Source: Cainiu Health

Dr. Liu Feng

Introduction

Blood oxygen refers to blood oxygen saturation. Under normal circumstances, blood oxygen saturation indicates the percentage of oxygenated hemoglobin relative to total hemoglobin in the blood, reflecting the oxygen content. Blood oxygen saturation is an important indicator for measuring the ability of human blood to carry and transport oxygen, with a normal range generally between 95% and 100%.

　　Blood oxygen refers to blood oxygen saturation. Generally, blood oxygen saturation indicates the percentage of oxygenated hemoglobin relative to total hemoglobin in the blood, reflecting the oxygen content. Detailed analysis is as follows:

　　Blood oxygen saturation is the percentage of oxygenated hemoglobin in the total hemoglobin within the blood, serving as an important indicator for evaluating the blood's capacity to carry and transport oxygen. The normal range is typically between 95% and 100%. When oxygen is inhaled into the body, it combines with hemoglobin to form oxygenated hemoglobin. Blood oxygen saturation reflects the extent of this combination; a higher saturation indicates more adequate oxygen content in the blood, enabling better oxygen supply to various tissues and organs throughout the body.

　　The lungs take in oxygen through respiration, which is then transported to the entire body by the heart through blood circulation. Blood oxygen saturation visually indicates whether this process is functioning normally. If lung diseases affecting gas exchange or cardiac dysfunction causing circulatory problems occur, blood oxygen saturation may decrease, thereby impacting the normal functioning of various organs.

　　In daily life, engaging in moderate physical activities such as walking, jogging, or yoga can help enhance cardiopulmonary function and improve the blood's oxygen delivery capacity.

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