H. pylori Stool Antigen Test Kit (Colloidal Gold Method) is a rapid in vitro qualitative procedure for the detection of Helicobacter pylori antigens in human stool. The stool antigen detection is intended to aid in the diagnosis of H. pylori infection and to demonstrate loss of H. pylori stool antigen following treatment.Conventional medical practice recommends that testing by any method to confirm loss of antigen be done at least four weeks following completion of therapy.