title: How do I interpret a positive diagnostic test?
authors.forename: Jerry D
authors.initials: JD
authors.lastname: Gardner
mesh_terms: D003938:Diagnostic Techniques, Digestive System / Q000592:standards*; D016145:Endoscopy, Digestive System / Q000592:standards; D005745:Gastric Acidity Determination; D005750:Gastric Juice / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012680:Sensitivity and Specificity
chemical_list: D000644:Quaternary Ammonium Compounds