PT - JOURNAL ARTICLE AU - Wang, Ran AU - Davis, Michael D TI - A Concise Review of Exhaled Breath Testing for Respiratory Clinicians and Researchers AID - 10.4187/respcare.11651 DP - 2024 May 01 TA - Respiratory Care PG - 613--620 VI - 69 IP - 5 4099 - http://rc.rcjournal.com/content/69/5/613.short 4100 - http://rc.rcjournal.com/content/69/5/613.full AB - Exhaled breath contains an extensive reservoir of biomolecules. The collection of exhaled breath is noninvasive and low risk. Therefore, its testing is an appealing strategy for the discovery of biomarkers of respiratory diseases. In this concise review, we summarize the evidence of exhaled breath tests for airways diseases and respiratory infections. An overview of breath collection methods in both individuals who are spontaneously breathing and those receiving mechanical ventilation is outlined. We also highlight the challenges in exhaled breath testing and areas for future research.