The mean upper airway cross-sectional area at functional residual capacity when sitting or supine provided no further significant advantage over clinical variables for the discernment of obstructive sleep apnea, finds a study published in ATS Journals.

Due to resource limitations the testing of patients for obstructive sleep apnea (OSA) is often delayed. There is a need to accurately triage and expedite testing in those with a high pre-test probability of OSA. Acoustic pharyngometry is a non-invasive simple technique used to assess the upper airway cross-sectional area (UA-XSA), which is known to be reduced in those with OSA.