Peptest is an accurate, painless and inexpensive test that tells you conclusively if you have reﬂux. Reﬂux diagnosis typically entails expensive, invasive and time-consuming tests, such as 24/48 hour pH monitoring, pH Impedance, Barium Swallow, and Endoscopy. All expensive, invasive, time consuming and unpleasant for the patient. But Peptest simply measures the presence of a stomach enzyme called pepsin in a sample of your saliva. Because pepsin is only produced in the stomach, if it is found in the oesophagus, the throat, the mouth or the lungs – then we know it has been refluxed.