Hello Madabs
Welcome to HealingWell. I am glad you found this forum.
A pH probe:
A thin plastic tube (catheter) is placed into a nostril, guided down the throat and then into the esophagus.
The tube stops just above the lower esophageal sphincter, which is at the connection between the esophagus and the stomach.
At the end of the tube inside the esophagus is a sensor that measures pH.
The other end of the tube outside the body is connected to a monitor that records the pH levels for 24 hours. Normal activity is encouraged during the study, and a diary is kept of symptoms experienced or activity that might be suspicious for reflux, such as gagging or coughing.
The pH readings are evaluated and compared to the child's activity for that time period. There is some discomfort from what I know but perhaps a member that has been through the procedure will have a answer for you.
Again, Welcome
Kitt