What is the function of a pulse oximeter?

The function of a pulse oximeter is to measure the oxygen saturation level in a patient's blood. This device is key in assessing how well oxygen is being transported throughout the body, which is vital for evaluating a patient's respiratory efficiency and overall health status. The pulse oximeter operates by using light absorption characteristics of oxygenated and deoxygenated hemoglobin, providing real-time readings of blood oxygen levels typically expressed as a percentage. This information is crucial in various medical settings, especially for patients with respiratory illnesses or those undergoing anesthesia.

Other options focus on functions that are not performed by a pulse oximeter. For instance, measuring pulse rate may be involved, but it is not the primary function. Monitoring heart rhythm is a role for electrocardiograms, not pulse oximeters. Assistance in medication administration falls outside of the capabilities of a pulse oximeter, as its sole purpose is related to oxygen saturation monitoring.