24 Hour pH Study

What is 24 hour pH study?

This is a test to determine how much acid reflux (acid coming from the stomach up into the

24 hr pH Test

esophagus/swallowing tube) occurs over a one day period. The test also allows your doctor to determine what the relationship is between your particular symptoms or complaints and episodes of acid reflux. The test is performed to examine patients with heartburn, regurgitation, chest pain, cough, sore throat, voice changes or asthma.

The test involves inserting a small flexible tube through your nose and into your esophagus. This allows you to eat and drink d

24 hour pH monitor

uring the test. The tube is positioned above the valve between your stomach and esophagus, and it is taped to your nose to hold it in place. You go home with the tube in place and carry on with regular daily activities. There are only a few minor limitations to your activities and these are explained on the instruction sheet you will be given to take home with you. These instructions also explain how to take care of the tube and how to record your symptoms over the 24 hour period of the study. You return the next morning to have the tube removed. Each of the two visits for the tube insertion and tube withdrawal will only take a few minutes.

Other than some minor irritation to your nose and throat, there are no risks associated with this test. You will be able to eat and drink immediately after the tube is inserted.


Please report to the OUTPATIENT DEPARTMENT at St. Joseph's Health Care, London, 15 minutes before your appointment to register.

DO NOT EAT OR DRINK ANYTHING, including water, after midnight the night before your test.

Please stop all stomach medications (check list below) 72 hours before the test.

Omeprazole (Losec) Cimetidine (Tagamet)
Ranitidine (Zantac) Nizatidine (Axid)
Famotidine (Pepcid) Domperidone (Motilium)
Metoclopramide (Maxeran) Cisapride (Prepulsid)
Lansoprazole (Prevacid) Pantoprazole (Pantoloc)
Tums, Maalox, etc.  

You will be required to return the following day to have the tube removed.