What is oximetry?

Oximetry is a noninvasive method of monitoring a person's oxygen saturation (SpO2). An oximeter, typically placed on a fingertip or earlobe, passes beams of light through the blood and measures the absorption rates. This measurement indicates the percentage of hemoglobin in the blood that is saturated with oxygen. It is commonly used in hospitals, clinics, and at home to assess respiratory function and detect hypoxemia (low blood oxygen levels).