A 24 hour pH study test is performed to evaluate the amount of stomach acid washing up into the esophagus over the course of a 24-hour period. This study is often done in patients with heartburn or other stomach problems or as a pre-operative test before an acid reflux surgery.
Pre-24 pH Study Test Expectations
7 days prior to the test:
The following medications should be stopped: Prilosec (omeprazole), Prevacid (lansoprazole), Protonix (pantoprazole) and Aciphex (rabeprazole). Occasionally, under special doctor’s instructions, these medications are continued through the testing period for specific reasons.
2 days prior to the test:
The following medications should be stopped: anti-ulcer or antacid medications (i.e., Tagamet, Pepcid, and Zantac).
1 day prior to the test:
The following medication should be stopped: Reglan (metoclopramide).
12 hours prior to test:
The following medications should be stopped with your physicians approval: nitrobid, nitropaste, nitroglycerine patches, verapamil, cardizem and nifedipine.
No food or liquid (includes water) after midnight the night before the test
24 pH Study Test Procedure
A topical anesthetic is sprayed into the nose.
A thin flexible wire is passed through the nose and positioned into the lower esophagus.
Usually no additional sedation is given during the test.
This wire has small acid sensors built into the tip of the tube. The other end of the wire is connected to a small computer that is worn by the patient.
The patient is asked to wear the acid sensor for 24 hours. The computer records the amount of acid coming up from the stomach into the esophagus.
- The patient returns the next day to have the wire and the computer removed. The wire and the computer take about 30 minutes to set up and about 5 minutes to remove.
This test is often done immediately after the esophageal manometry.
This test is available at the Highland Park Hospital GI Lab, to schedule an appointment call 847.480.2828.