Esophageal Ph Test
Medically reviewed by Drugs.com. Last updated on Apr 6, 2025.
Why do I need an esophageal pH test?
An esophageal pH test measures the amount of stomach acid that reaches your esophagus. This test is often used to diagnose gastroesophageal reflux disease (GERD).
How do I prepare for the test?
- Stop taking antireflux medicines before your test, as directed.
- Do not eat or drink for 4 to 6 hours before your test.
Drugs used to treat this and similar conditions
Nexium
Nexium is used to treat GERD and other conditions involving excessive stomach acid. Learn about ...
Omvoh
Omvoh is used to treat moderate to severe ulcerative colitis or Crohn's disease in adults. This ...
Protonix
Protonix (pantoprazole) is used to treat erosive esophagitis and other conditions involving excess ...
Prilosec
Prilosec (omeprazole) is used to treat symptoms of GERD and other conditions caused by excess ...
Phazyme
Phazyme is used for endoscopy or radiology premedication, functional gastric disorder, gas ...
Dexilant
Dexilant is used for barrett's esophagus, erosive esophagitis, GERD
Famotidine
Famotidine is used to treat and prevent ulcers in the stomach and intestines. Learn about side ...
Pantoprazole
Pantoprazole is a proton pump inhibitor used to treat GERD, erosive esophagitis, and ...
What will happen during the test?
You may receive medicine to numb the area or help you relax. A catheter (small tube) will be inserted into your nose or mouth. The catheter is used to lower a probe into your esophagus. The probe may stay attached to the catheter. If so, the catheter is taped to your nose to hold it in place. Sometimes the probe is wireless, so the catheter is removed after the probe is placed.
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What should I expect after the test?
The probe will measure your stomach acid levels while you go about your usual daily activities. The measurements are transferred to a small storage device that you wear at your waist or shoulder. You must return to have the catheter removed the next day. The wireless probe can collect data for 2 days or more. It will travel through your digestive system and come out in a bowel movement.
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Further information
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