CPT® Code 87450

Deleted

Infectious agent antigen detection by immunoassay technique, (eg, enzyme immunoassay [EIA], enzyme-linked immunosorbent assay [ELISA], immunochemiluminometric assay [IMCA]), qualitative or semiquantitative; single step method, not otherwise specified, each organism

The CPT® Code 87450 refers to a laboratory test designed to detect infectious agent antigens in blood and other body fluids through the use of immunoassay techniques. This code encompasses various methodologies, including enzyme immunoassay (EIA), enzyme-linked immunosorbent assay (ELISA), and immunochemiluminometric assay (IMCA). These techniques are pivotal in clinical diagnostics as they utilize labeled antibodies to identify specific antigens present in patient samples. The EIA and ELISA methods are particularly sensitive, capable of detecting minute quantities of antigens due to the incorporation of a secondary enzyme-labeled antibody. This enzyme catalyzes a reaction that results in a color change or fluorescence, allowing for qualitative or semiquantitative assessment of the infectious agent's presence. On the other hand, IMCA employs a light emission device to quantify the antigen-antibody complex, providing a more precise measurement of the infectious agent. The testing can be performed using a single-step method, where the labeled antibody is added to the sample, followed by a wash and examination, or a multi-step method that involves several washes and additional labeled antibodies. It is important to note that this code specifically applies to the single-step method for each organism that is not otherwise specified (NOS), distinguishing it from other related codes that may involve multi-step methods or multiple organisms.