Premier C. difficile GDH is a qualitative enzyme immunoassay screening test to detect Clostridium difficile antigen, glutamate dehydrogenase, in fecal specimens from symptomatic persons suspected of having C. difficile infection (CDI). This test does not distinguish between toxigenic and non-toxigenic strains of C. difficile. Samples from symptomatic patients that produce positive results with this test must be further tested with an assay designed to detect toxigenic C. difficile strains and assist with the diagnosis of CDI.