What is a nocturnal oximetry test primarily used for?

A nocturnal oximetry test is primarily used for recording oxygen levels overnight. This test involves the use of a pulse oximeter, which is a non-invasive device that attaches to a person's finger or earlobe to continuously measure the oxygen saturation in the blood. The primary objective of this test is to determine if a patient experiences any episodes of hypoxemia (low blood oxygen levels) during sleep, which can be indicative of conditions such as obstructive sleep apnea or other respiratory disturbances.

By collecting data on oxygen levels throughout the night, healthcare professionals can assess the severity of a patient's condition and make informed decisions about further evaluation or treatment options. The information garnered from this test is critical in diagnosing sleep-related breathing disorders, guiding therapeutic interventions, and monitoring response to treatment over time.