pH-Impedance Probe Test

Do not eat or drink anything after midnight prior to your test. Do not smoke the day of your test. Follow your physician’s instructions regarding discontinuing medications.

Drugs such as proton pump inhibitors (Aciphex®, Prilosec®, Prevacid®, Protonix®, Nexium®) or H2 blockers (Axid®, Pepcid®, Tagamet®, Zantac®) may affect test results. It is recommended that these drugs be withheld seven days prior to the test.

Your physician will instruct you whether to take these medications or withhold them. If your physician instructs you to withhold the above medications and you experience discomfort, you may take antacids, such as Rolaids®, Tums® or Mylanta®. If you are an asthma patient, bring your inhaler to the center with you.

This test is conducted as an out-patient procedure. You may drive yourself home after the test.

The following steps will occur during the procedure:

1. An esophageal motility test is first done to determine correct placement of the pH-impedance probe. This involves inserting a very small catheter into the nostril and advancing it into the stomach. The catheter is withdrawn slowly as you take sips of water.

   This portion of the test takes 20 to 25 minutes, and the motility catheter is removed upon completion.

2. Next, a different catheter, called a pH-impedance probe, is inserted into the nostril and advanced into the esophagus. The pH probe will remain in place for 24 hours and is connected to a small recorder that you will carry on a strap over your shoulder.

   You will return the following day to have the probe removed. Written instructions will include information regarding diet, medications, smoking and bathing. We will also give you a diary sheet to record selected events throughout the 24-hour period.

3. While the pH probe is in place, some patients experience irritation in the throat, which can be relieved by taking sips of water. Do not use throat lozenges, which could affect the results of the test.

Some patients find it more difficult to sleep than usual because they are aware of the probe. Although the probe does not prevent eating or drinking, some patients find these activities somewhat uncomfortable.

Discomfort typically lessens as you adjust to the probe being in place. However, some patients may experience a nosebleed. 

We understand the concerns that come with acid reflux, GERD and heartburn. Whether you are looking for a diagnosis or a second opinion, we’re here to discover the cause of acid-related symptoms you may be experiencing. 

The center’s compassionate team of gastroenterologists will test your symptoms and design a personalized treatment plan that works for you and your family.