Hi There! Just wondering if you are referring to the pH Monitoring system capsule that they attach to your esophagus when they do the endoscopy? Im being scheduled for an endoscopy and I recieved a letter from my clinic stating I am a good candidate for the Bravo PH Monitoring system. Im going to have to have it in for 48 hours and monitor my acid levels in my esophagus that transmite to a pager type reciever Im to wear on my side pocket or where ever I can connect it to me. The capsule is spose to fall off several days after the procedure is over and pass through me. I guess reading all the literature on it. Even going to the website. I have not run across a side efffect that it may not pass through! If this is the same thing you had done please keep us posted as I would be very interested in knowing how they plan on finding and retrieving it. Good Luck to you!