Patient instructions for 48-hour Bravo pH study

You are scheduled for a 48-hour Bravo pH study. The Bravo pH monitoring system is used for gastroesophageal pH measurements and monitoring of gastric reflux. The study involves a pH capsule, approximately the size of a gelcap that is attached to your esophagus. During the study, the Bravo capsule measures the pH in the esophagus and transmits this information to a small receiver worn on your belt or waistband. You will be given a diary to write down the times when you have reflux symptoms (e.g. coughing, heartburn, chest pain, regurgitation), and when you eat or lie down. After the study is completed, you need to return the diary and the Bravo receiver to the lab (room 3016). Several days after the study, the capsule naturally falls off the digestive tract and is eliminated from the body.

Please arrive 30 minutes prior to your appointment. If you are unable to keep your appointment, you must cancel at least 48 hours in advance, or you will be referred back to  your primary care physician.


  • Wear loose comfortable clothing.
  • Do NOT eat or drink anything six hours prior to capsule insertion.
  • Discontinue all proton pump inhibitors (Prevacid, Prilosec, Aciphex, Nexium) for seven days prior to the study.
  • Discontinue all other medications known to interfere with gastric function (Propulsid, Reglan, Axid, Pepcid, Tagmet, Zantac) 72 hours prior to the study.
  • Discontinue all antacids (Maalox, Mylanta, Tums, Rolaids, Amphogel, Gaviscon) 24 hours before study.
  • You will be able to drive to and from your appointment unless an upper endoscopy (EGD) is required for Bravo capsule insertion. That procedure requires sedation and you MUST have someone drive you home after the procedure.
  • You can NOT have an MRI study done for 30 days after having the Bravo procedure.

If the esophageal study is being performed to test the effectiveness of medicine, patients should continue their normal medication.

If you have any questions or concerns, please call the Gastroenterology Unit, Monday through Friday, 7:30 a.m. to 4 p.m. at 916-734-5561.