What is the primary purpose of conducting a spirometry test alongside polysomnography?

Conducting a spirometry test alongside polysomnography is primarily aimed at assessing respiratory function. Spirometry measures how much air an individual can inhale and exhale, as well as how quickly they can do so. This information is vital in evaluating the patient's overall pulmonary health and identifying any underlying respiratory issues that could affect sleep quality and overall health.

In the context of polysomnography, which is used to diagnose sleep disorders, understanding a patient's respiratory function can help in diagnosing conditions such as sleep apnea or other sleep-related breathing disorders. Poor respiratory function can lead to significant drops in oxygen levels during sleep, which can, in turn, disrupt sleep architecture and lead to further complications. Therefore, the collaboration of these two tests provides a comprehensive view of both sleep and respiratory health, allowing for more accurate diagnosis and effective treatment planning.