What is the normal blood oxygen level for the elderly?

Feb 06, 2025 Source: Cainiu Health

Dr. Liu Feng

Introduction

Blood oxygen refers to blood oxygen saturation. Under normal circumstances, the blood oxygen saturation of arterial blood in the elderly is 95%-100%, while the blood oxygen saturation of venous blood is usually around 75%. During respiration, oxygen inhaled by the lungs binds with hemoglobin within red blood cells in the blood, forming oxyhemoglobin. This process occurs efficiently in the lungs, allowing arterial blood to become rich in oxygen.

　　Blood oxygen refers to blood oxygen saturation. Under normal circumstances, the blood oxygen saturation of arterial blood in the elderly is 95%-100%, while the blood oxygen saturation of venous blood is usually around 75%. Detailed analysis is as follows:

　　During respiration, oxygen inhaled by the lungs combines with hemoglobin in red blood cells to form oxyhemoglobin. This process efficiently occurs in the lungs, enriching arterial blood with oxygen, thus achieving a high blood oxygen saturation level of 95%-100% in the elderly. This value reflects the ability of the lungs to inhale oxygen, the heart to pump blood, and hemoglobin to bind with oxygen.

　　Venous blood has already passed through the body's tissues and organs, releasing most of its oxygen for cellular use. During the process of blood circulation, arterial blood delivers oxygen to various parts of the body, where tissue cells utilize this oxygen for metabolic activities while simultaneously producing carbon dioxide. After collecting this oxygen-depleted blood, the blood oxygen saturation of venous blood naturally decreases. Therefore, the normal blood oxygen saturation of venous blood in the elderly is typically around 75%.

　　In daily life, regular ventilation by opening windows to maintain fresh indoor air helps reduce the occurrence of respiratory diseases, thereby maintaining normal blood oxygen saturation levels.

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