The feeling of heartburn can be caused by acids from the stomach or by the movement of gas and air through the esophagus. It is hard to distinguish the difference based on the symptoms alone and pH Impedance testing may be required to determine the source of the pain.
Before the test it is important to follow your doctor’s instructions regarding eating and drinking prior to the test. During the test a thin tube is inserted through the nose and down into the esophagus. For this test, the tube is attached to a wearable recording device that will monitor your esophagus, for 24 hours, to determine if there are fluctuations in the acid levels.
During the 24 hours, you can go about your regular activities, including eating and drinking. The point is to try to recreate the symptoms. At the end of 24 hours you will return to the office and have the testing device removed.