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Table 2 Positive EBC pH profile in a chronic cough patient who subsequently responded well to proton pump inhibition. Note that the patient provides multiple EBC samples over the course of 1 – 2 days, both immediately after coughing, and in the absence of a recent cough (none in previous 1 hour). There are several cough episodes for which there is a low EBC pH value, while other values are normal (revealing transience of the low EBC pH value in this chronic cough patient)

From: Identification of acid reflux cough using serial assays of exhaled breath condensate pH

Date Time Symptom EBC pH
12/26/04 1545 Cough 8.3
12/26/04 1745 Cough 5.0
12/26/04 1945 Cough 7.9
12/27/04 1015 Cough 6.0
12/27/04 1215 Cough 7.7
12/27/04 1730 Well 8.1
12/27/04 1930 Well 7.7
12/27/04 2130 Cough 5.8