Is enzyme immunoassay (EIA) used to diagnose Clostridium difficile (C diff) infection (CDI)?

Updated: Jul 25, 2019
  • Author: Faten N Aberra, MD, MSCE; Chief Editor: BS Anand, MD  more...
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However, although EIA is a rapid test for C difficile toxin A and B, it is not an ideal alternative test for diagnosing CDI, due to it having a lesser sensitivity than the cell cytotoxin assay (see below). Nonetheless, the poor sensitivity of EIA can be overcome by obtaining repeat stool specimens or by combining EIA with polymerase chain reaction (PCR) assay or C difficile antigen (glutamate dehydrogenase [GDH]) EIA.

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