The ph test the ph test for acid reflux (gastroesophageal reflux disease or gerd) measures how often and for how long stomach acid enters the esophagus, and how well it clears the esophagus performed with a thin, plastic tube armed with a sensor, it measures the amount of acid backing up into the esophagus. Acid reflux test duration. When acid repeatedly “refluxes” from the stomach into the esophagus alone, it is known as gastroesophageal reflux disease (gerd) however, if the stomach acid travels up the esophagus and spills into the throat or voice box (called the pharynx/larynx), it is known as laryngopharyngeal reflux (lpr).
acid reflux test duration
