What is the normal blood oxygen saturation level for a healthy person?

Normal blood oxygen saturation is divided into arterial oxygen saturation and venous oxygen saturation. The normal range of arterial oxygen saturation is 95% to 98%, while the normal range of venous oxygen saturation is 64% to 88%. If abnormalities are detected, timely medical consultation is recommended. Detailed explanations are as follows:

Arterial oxygen saturation refers to the percentage of oxygenated hemoglobin relative to total hemoglobin in arterial blood, reflecting the body's oxygenation status. Under normal physiological conditions, the arterial oxygen saturation of healthy adults is usually between 95% and 98%.

Venous oxygen saturation refers to the percentage of oxygenated hemoglobin relative to total hemoglobin in venous blood. Since venous blood has already passed through body tissues and organs and released most of its oxygen, its oxygen saturation is generally lower than that of arterial blood. In healthy individuals, venous oxygen saturation typically ranges from 64% to 88%.

Blood oxygen saturation can generally be measured non-invasively using devices such as pulse oximeters. The results may be influenced by various factors including instrument accuracy, measurement site, patient cooperation, and more. During blood oxygen saturation measurement, it is important to ensure the accuracy of the device and that the patient remains calm and cooperative to minimize measurement errors.