What does a pulse oximeter measure?

A pulse oximeter specifically measures the oxygen saturation level in the blood, providing data on how much oxygen is being carried by the hemoglobin in the red blood cells. This is typically expressed as a percentage, indicating the efficiency of oxygen transport in the body.

In clinical practice, monitoring oxygen saturation is crucial for assessing a patient's respiratory function, especially in individuals with conditions affecting the lungs or heart. By using a pulse oximeter, healthcare providers can quickly identify if a patient is experiencing hypoxemia, which can require immediate medical attention. Thus, the ability of the device to quantify oxygen saturation is fundamental to its use in various healthcare settings.