How to read the parameters of a blood oxygen monitor
Feb 07, 2025
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
The main parameters of a pulse oximeter include arterial oxygen saturation, pulse rate, and perfusion index. To interpret pulse oximeter parameters, one should assess the measured values against the normal reference ranges to determine the body's condition. The normal range for arterial oxygen saturation is 95% to 100%, the normal pulse rate is 60 to 100 beats per minute, and the normal perfusion index range is 4 to 5.
The parameters of a pulse oximeter mainly include arterial oxygen saturation, pulse rate, and perfusion index. Assessing these parameters involves comparing measured values with the normal reference ranges to determine the body's condition. If any abnormalities are detected, prompt medical attention is recommended. Detailed explanations are as follows:
Arterial oxygen saturation refers to the proportion of oxygen-bound hemoglobin in arterial blood, which may be displayed on the pulse oximeter as SpO2. The normal range for arterial oxygen saturation in healthy individuals is generally 95% to 100%. If oxygen saturation falls below the normal range, it typically indicates insufficient oxygen supply and possible hypoxia.
Pulse rate refers to the frequency of arterial pulsations, which may be indicated on the pulse oximeter as PR. The normal pulse rate for a healthy adult at rest is 60 to 100 beats per minute. However, pulse rate can be influenced by various factors such as age, gender, body type, physical activity, emotional state, diet, and medications. Individuals who exercise regularly often have stronger cardiopulmonary function, and a slightly lower pulse rate is considered normal in such cases.
The perfusion index reflects the perfusion status of the extremities and may be labeled as PI on the pulse oximeter. A higher arterial blood flow results in a higher perfusion index. The normal range for the perfusion index is 4 to 5. A low perfusion index suggests inadequate peripheral perfusion or conditions such as hypovolemic shock. In such cases, fluid replacement should be considered to ensure adequate circulatory blood volume.
When using a pulse oximeter, ensure the device is functioning properly and follow the correct operating procedures to avoid interference from external factors that may affect measurement accuracy. If abnormal readings occur, it is recommended to seek medical evaluation at a qualified healthcare facility promptly.
