What is the primary function of a pulse oximeter in a clinical setting?

The primary function of a pulse oximeter is to measure the oxygen saturation level of the patient's blood. This non-invasive device provides critical information by determining the percentage of hemoglobin in the blood that is saturated with oxygen. It works by passing light through a finger, toe, or earlobe; the device then calculates the oxygen saturation based on how the light is absorbed by oxygenated and deoxygenated blood.

Monitoring oxygen saturation is essential, especially in clinical settings, as it helps healthcare providers assess a patient's respiratory status and ensure that they are receiving adequate oxygenation. This information is vital in managing conditions such as chronic obstructive pulmonary disease (COPD), asthma, pneumonia, and during and after surgical procedures, where maintaining appropriate oxygen levels is crucial for patient safety and recovery.