Understanding pH studies
Both of these exams collect pH levels from secretions in your esophagus and assist the doctor in treating you.
Bravo 48-hour pH study
A Bravo 48-hour pH study is initiated during an EGD exam. The doctor will place a catheter through the flexible, lighted tube (gastroscope) and, after careful measurements, insert a small capsule in your esophagus. This capsule adheres to the wall of the esophagus and monitors pH levels. You will be sent home with a small transmitter box which collects data from the capsule. You are to return the transmitter box in 48 hours. The capsule will pass through your GI system. There is no external catheter. Some people are unable to have this exam due to implanted devices (heart defibrillators) or esophageal anatomy.
24-hour pH study
A 24-hour pH study is done by gently placing a tiny catheter through your nose and taping it in place, after careful measurements. This catheter will measure your pH levels. The catheter is connected to a transmitter box you take home. You will bring the transmitter box back in 24 hours and the catheter will be removed from your nose.