The SpO2 index is important to human health. This is one of the body's vital signs, along with four other signs: pulse, temperature, breathing rate and blood pressure.

SpO2 is an index that measures the oxygen saturation in peripheral blood, which is a very important index for human health, especially in newborns. Usually, before emergency treatment, doctors will clamp an SpO2 measuring device on the patient's arm or leg. Based on the SpO2 index, doctors can accurately assess the patient's health and have the most effective treatment plan.

Vital signs are numbers measured by various devices and techniques to assess the basic functions of the body. There are four traditional vital signs: pulse, temperature, respiratory rate, and blood pressure. However, many researchers have now mentioned a fifth vital sign, which is the SpO2 index.