Decrease (-) Restore Default Increase (+)
Print    Email
Bookmark and Share

24 Hour pH Study

24 Hour pH Study

St. Mary's Endoscopy Suite Treatment & Procedures -
24 Hour pH Study

What is a 24 Hour impedence pH Study?

Your doctor requested this study to learn how frequently the gastric contents reflux up into your esophagus. A very small probe will be placed through your nose into your esophagus. This tube is attached to a small computer which will record each interval that the stomach contents washed up from your stomach into the esophagus.

What Preparation is Required?

To prepare for this study, we request that you follow the instructions below concerning diet and gastric acid reduction medications. 

The study may be performed while you continue to take your gastric acid reduction medications,OR the study may be performed while you hold gastric acid reduction medications.

  • Do not take PRILOSEC (Omeprazole), PROTONIX (Pantoprazole Sodium), PREVACID (Lansoprazole), Nexium, or ACIPHEX (Rabeprazole) for seven days before the study.
  • Do not take AXID (Nizatidine), PEPCID AC (Famotidine), ZANTAC, (Ranitidine), TAGAMET (Cimetidine) for four days before the study.
  • Starting at Midnight before the test, DO NOT eat or drink anything and DO NOT take any antacids (TUMS, ROLAIDS, MAALOX, and MYLANTA, etc.)

You may take medications not mentioned above up to two hours before the scheduled time. You can bring along your morning medications and may take them as soon as the probe is in place.  Wear a shirt that buttons down the front.

What Can I Expect for My 24 Hour pH Study?

The information from the questionnaire that you filled out before this study will assist the Gastroenterology nurse to identify your most frequent symptoms. Your complaints or symptoms are entered into the datalogger, which is a small computer which connects to a small diameter probe.

When you return home, you may choose to wear a shirt or smock that has large pockets. You may be more comfortable by placing the datalogger and its carrier into the shirt pocket rather than wearing the shoulder strap. Place the datalogger under your pillow when in bed.

The datalogger will record symptoms and your body position as you perform your regular daily duties. Simply press the button when you experience any of those symptoms.  We would prefer that you continue to do your outside activities or household chores such as making the bed, running the vacuum, working in your garden or any other activity that you do daily. These activities may bring on your symptoms. When the symptoms occur, you will push the symptom button so that we can correlate your symptoms with the pH that is being recorded.

Knowing what symptoms that you experience during this test and what activity produces those symptoms will help us provide results that will assist your doctor in making his or her diagnosis. If you forget to push the button, write the activity on the back of the patient instruction sheet along with the time that the symptoms occurred.

To perform this study a mild anesthetic will be placed into your nostril and then the small probe will be passed through the nostril and into the esophagus. It will be taped at the nose so that the tip of the probe stays at the desired location to record the contents in the esophagus, as the stomach contents come up from the stomach into the esophagus.

Registration and Parking

Please  feel free to park in any of the visitor parking lots. Enter through the hospital main entrance and report to the front lobby registration desk. You and your family will then be directed to the Endoscopy Suite. If you have any questions, please call (812) 485-4911.


© 2015 St. Mary's Health System   |  3700 Washington Avenue  |  Evansville, IN 47750  |  (812) 485-4000