To diagnose GERD , in 24 hour ambulatory pH testing the percentage of the day that the pH was less than 4 is:
Correct Answer: > 5 %
Description: The percentage of the day that the pH was less than 4 with values exceeding 5% indicative of GERD.Intraluminal impedance monitoring can be added to pH monitoring to detect reflux events irrespective of whether or not they are acidic. Ref : Harrison, E-18, P- 2428
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