When is 24-hour pH monitoring used in the evaluation of asthma symptoms?

Updated: Nov 20, 2020
  • Author: Michael J Morris, MD, FACP, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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A 24-hour pH probe can be used to help diagnose gastroesophageal reflux disease (GERD) if a patient’s condition is refractory to asthma therapy. Empirical medical therapy is often tried without performing diagnostic tests for GERD, especially if a patient has symptoms of GERD. In cases of GERD, a prolonged trial of therapy may be necessary. The median time to improvement of GERD-induced cough has been reported as 3 months. [69] A 2012 study of severe asthmatics demonstrated that GERD was a significant component in these patients. [70]

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