For NHSN reporting purposes, a CDI LabID event is a positive laboratory test result for C. difficile toxin A and/or toxin B OR any detection of toxin-producing C. difficile organisms by culture or other laboratory means on an unformed stool specimen that conforms to the container. Testing methods include, but are not limited to, molecular assays such as PCR and/or toxin assays such as EIA.   If a multi-step testing algorithm is used to test for C. difficile toxins, refer to question #2 below. The CDI lab result (Antigen Positive, Toxin Negative) does not meet NHSN definition of a CDI-positive laboratory assay since the toxin result is negative.