Atypical presentation of pseudomembranous colitis with laboratory rejection of stool specimen.

(formerly ) is a major cause of nocosomial infection in the USA and worldwide. It has a wide spectrum of presentation, ranging from an asymptomatic carrier state to fulminant colitis. Pseudomembranous colitis is a manifestation of severe infection (CDI), typically with progressive symptoms including watery diarrhoea, abdominal cramping and fevers and elevated white cell count and/or creatinine. It is diagnosed on three levels, including clinical assessment, stool assays and visualisation of the colonic mucosa. Laboratories will reject stools that do not meet criteria for testing. In the era of molecular testing for the presence of toxigenic DNA, which only indicates the potential for infection, it is vital to use clinical evaluation in the diagnosis of CDI. We present an atypical case of pseudomembranous colitis affecting the right colon in a patient whose stools were rejected multiple times for testing.