What is the role of exhalation tests in the workup of asthma?

Updated: Oct 07, 2019
  • Author: John J Oppenheimer, MD; Chief Editor: Michael A Kaliner, MD  more...
  • Print


Exhaled nitric oxide (eNO) levels correlate with eosinophilic airway inflammation and are reduced by corticosteroid therapy. However, in a large, randomized trial of inner-city adolescent asthma patients, using eNO to guide medication decisions resulted in higher doses of inhaled corticosteroids being given without clinically important improvements in symptomatic asthma control. [21]

Exhaled breath condensate and exhaled breath temperature are also novel biomarkers that have been studied.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!