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An ambulatory pH study is a minimally invasive test that evaluates heartburn and related symptoms. It measures the frequency and duration of acid reflux. Through a procedure called an upper endoscopy (also known as an EGD or esophagogastroduodenoscopy
), your throat will be numbed with local anesthesia, and your doctor will temporarily attach a pH capsule to the wall of your esophagus. While there, the capsule measures the pH in the esophagus and transmits the information to a small recorder worn on your waistband or around your neck. Once the test is complete, usually 72 hours after it’s placed, you will return the recorder to us. The data will be uploaded onto a computer and it will be used to confirm a GERD diagnosis. Your provider will discuss results at your follow-up office visit and review next steps.