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Procedures

Bravo pH and impedance reflux testing

Reflux testing measures how often stomach contents back up into your esophagus and whether that lines up with your symptoms. It answers a key question before long-term medication or anti-reflux surgery: is reflux really the cause?

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Who it helps

  • Heartburn or regurgitation that doesn't respond to acid-reducing medicine
  • Chronic cough, hoarseness or throat clearing that may be reflux-related
  • Chest pain after heart causes have been ruled out
  • Anyone being considered for anti-reflux surgery or procedures

Two types of test

  • Bravo wireless pH capsule: a small capsule is attached to the lining of the esophagus during an upper endoscopy and records acid levels for 48 to 96 hours. There's no tube, and it falls off on its own within days to weeks.
  • pH-impedance catheter: a thin tube through the nose records for 24 hours and detects both acid and non-acid reflux, which matters if you're already on medication.

How to prepare

You'll usually stop acid-reducing medicines for about 7 days before the test, unless told to stay on them to test non-acid reflux. Your instructions will be specific.

During the test

Eat, sleep and work as normal so the test reflects a typical day. You press a button or log symptoms, meals and sleep.

Risks

Some people feel the Bravo capsule when swallowing for a few days. Rarely, it detaches early or needs to be removed. The nasal catheter can cause mild throat irritation.

Questions about reflux testing? Call (813) 400-0543 or send a message.

Dr. Brian Frank, MD
Written and reviewed by Brian Frank, MD
Board-certified gastroenterologist (ABIM). Last reviewed October 8, 2026.

This page is general information, not medical advice. For a medical emergency, call 911.