What does a pulse oximeter measure?
Feb 06, 2025
Source: Cainiu Health
Dr. Liu Feng
Introduction
Under normal circumstances, a pulse oximeter is a medical device used to measure blood oxygen saturation and pulse rate in the human body to reflect overall health status. The pulse oximeter determines blood oxygen saturation by detecting the ratio of oxygenated hemoglobin to reduced hemoglobin in the blood. Blood oxygen saturation refers to the percentage of oxygenated hemoglobin relative to the total hemoglobin capable of binding oxygen in the blood.
Under normal circumstances, a pulse oximeter is a medical device used to measure blood oxygen saturation and pulse rate in the human body, reflecting overall health status. A detailed analysis is as follows:
A pulse oximeter determines blood oxygen saturation by detecting the ratio of oxygenated hemoglobin to reduced hemoglobin in the blood. Blood oxygen saturation represents the percentage of oxygenated hemoglobin relative to the total hemoglobin capable of binding oxygen. It is an important indicator for assessing the function of the human respiratory and circulatory systems. When blood oxygen saturation falls below the normal range, it may suggest the presence of respiratory or cardiovascular diseases.
A pulse oximeter can also accurately measure pulse frequency, which is the number of heartbeats per minute. Pulse rate and strength reflect the condition of the heart function and the circulatory system. When the pulse is abnormal, it may indicate potential health issues such as heart disease or anemia. By measuring pulse rate, a pulse oximeter can help users understand their cardiac health and detect possible heart problems early.
When using a pulse oximeter, ensure that the sensor makes close contact with the skin, avoiding looseness or detachment. Additionally, keep the hand steady and avoid movement during measurement to prevent interference with the accuracy of the results.
