CPT® Code 87427

Infectious agent antigen detection by immunoassay technique, (eg, enzyme immunoassay [EIA], enzyme-linked immunosorbent assay [ELISA], fluorescence immunoassay [FIA], immunochemiluminometric assay [IMCA]) qualitative or semiquantitative; Shiga-like toxin

The CPT® Code 87427 refers to a laboratory test that detects the presence of Shiga-like toxin antigen using various immunoassay techniques. This test is particularly significant in identifying infections caused by specific strains of Escherichia coli (E. coli), such as E. coli O157, O26, O111, and O103, which are known to produce Shiga-like toxins. These toxins can lead to severe gastrointestinal conditions, including hemorrhagic colitis and hemolytic uremic syndrome, which can be life-threatening. The infection typically occurs through the consumption of contaminated food or water, and it can also spread from person to person through contact with contaminated feces. The procedure involves obtaining a fecal sample, which may be preserved in a fixative or sent fresh to the laboratory for analysis. The immunoassay techniques employed in this test include enzyme immunoassay (EIA), enzyme-linked immunosorbent assay (ELISA), fluorescence immunoassay (FIA), and immunochemiluminometric assay (IMCA). Each of these methods utilizes specific antibodies that bind to the Shiga-like toxin antigen, allowing for the detection of even minute quantities of the toxin. The EIA and ELISA methods produce a color change or fluorescence as a result of a chromogenic reaction, which can be quantitatively assessed. The FIA method employs a fluorescent compound to indicate the presence of the antigen, while the IMCA method utilizes chemiluminescent substances to measure the antigen-antibody complex through light emission. Overall, this test is crucial for diagnosing infections associated with Shiga-like toxins and guiding appropriate clinical management.