What does a pulse oximeter specifically measure?

A pulse oximeter is a non-invasive device that specifically measures the oxygen saturation of hemoglobin in the blood. It works by passing light through a thin part of the patient's body, usually a fingertip or earlobe, and assessing how much light is absorbed by oxygenated and deoxygenated hemoglobin. This measurement provides valuable information about how well oxygen is being transported throughout the body.

Understanding oxygen saturation is critical in various clinical settings, as it helps healthcare professionals monitor patients' respiratory function and overall oxygen delivery. When oxygen saturation levels drop below normal ranges, it can indicate respiratory distress or other complications, prompting timely intervention.

The other choices, while important parameters in patient assessment, do not pertain to what a pulse oximeter measures. This is why recognizing the specific function of the pulse oximeter as measuring oxygen saturation is crucial for clinical practice.