<unk>  is a technique used in the diagnosis of gastroesophageal reflux disease (GERD), by monitoring both<unk>  and pH. Patients with ongoing symptoms while on proton-pump inhibitor (PPI) therapy are commonly diagnosed with<unk>  while continuing their medications. The<unk>  diagnostic test determines the frequency of reflux episodes and the time relationship of reflux episodes and symptoms. The<unk>  test determines if the patient's symptoms are related to acid reflux, related to nonacid reflux, or not related to reflux of any type. A positive GERD diagnosis is made if acid or nonacid reflux precedes symptoms in a statistically meaningful manner. Patients with a positive<unk>  test may benefit from acid-reduction therapy such as fundoplication surgery or endoscopic fundoplication techniques.
Impedance–pH monitoring
Esophageal pH monitoring
Gastric tonometry
GI cocktail
Gastric lavage
Oral food challenge
Hydrogen breath test
Acid perfusion test