CPT® Code 87425

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; rotavirus

The CPT® Code 87425 refers to a laboratory test specifically designed for the detection of rotavirus antigen using various immunoassay techniques. Rotavirus is a group of viruses characterized by their wheel-like shape, primarily affecting the intestines and leading to rotaviral enteritis, which is most prevalent in infants and young children. This condition is marked by severe diarrhea, often resulting in copious amounts of watery stool, which can lead to dehydration, abdominal cramps, anorexia, low-grade fever, vomiting, and significantly decreased urine output, along with the loss of essential electrolytes. The test involves obtaining a fecal sample, which can either be placed in a fixative or sent fresh to the laboratory for analysis. The detection methods included in this code encompass enzyme immunoassay (EIA), enzyme-linked immunosorbent assay (ELISA), fluorescence immunoassay (FIA), and immunochemiluminometric assay (IMCA). EIA and ELISA are particularly sensitive techniques that can identify very small quantities of the rotavirus antigen by utilizing a specific antibody that binds to the antigen in the sample. A secondary enzyme-labeled antibody is then added, which facilitates the detection of the antigen through a chromogenic reaction, resulting in a visible color change or fluorescence that can be quantitatively assessed. FIA operates on a similar principle but employs a fluorescent compound to detect the binding of the antibody to the analyte molecule, allowing for the measurement of fluorescence at different wavelengths. IMCA, on the other hand, utilizes antibodies labeled with a chemiluminescent substance to identify and quantify the antigen-antibody complex through light emission. The results of this test can be reported qualitatively or semi-quantitatively, providing crucial information for the diagnosis and management of rotavirus infections.