What does a pulse oximeter measure?

A pulse oximeter is a non-invasive device that specifically measures the oxygen saturation level in the blood, which is a crucial indicator of how well oxygen is being transported to the body's tissues. This measurement is represented as a percentage, indicating the proportion of hemoglobin molecules in the blood that are saturated with oxygen.

By assessing oxygen saturation, healthcare providers can determine if a patient is receiving sufficient oxygen, which is vital for their overall health. In clinical settings, this device is frequently used to monitor patients with respiratory issues, during surgeries, and in various other medical situations where monitoring oxygen levels is essential.

The other options represent different parameters altogether: heart rate is measured in beats per minute, blood pressure refers to the force of blood against the artery walls, and temperature indicates the body's thermal state. Thus, a pulse oximeter's function is distinct and crucial for evaluating a patient's respiratory function specifically.