CPT® Code 87274

The CPT® Code 87274 refers to the detection of the Herpes simplex virus type 1 (HSV-1) antigen using an immunofluorescent technique. This procedure involves testing a blood sample to identify the presence of HSV-1, which is a virus that can cause infections primarily through direct contact. The initial infection with HSV-1 often manifests as ulcerations on the skin or mucous membranes. After the primary infection, the virus can enter a latent phase, remaining dormant in the body and potentially reactivating due to various triggers such as other illnesses, infections, or stress. Certain populations, including neonates and individuals with compromised immune systems, are particularly vulnerable to severe complications, including ocular or central nervous system infections. HSV is categorized into two types: type 1, which is commonly associated with oral herpes (cold sores) but can also lead to genital infections, and type 2, which primarily causes genital herpes. The immunofluorescent antigen detection method for HSV-1 utilizes a direct fluorescent antibody (DFA) technique. In this process, a blood sample is collected, and a specific reagent for HSV-1 is applied to the specimen. The sample is then incubated in a controlled environment to facilitate the antigen-antibody reaction. Following incubation, the specimen undergoes washing to eliminate any unbound conjugate, after which it is dried and mounted for examination. A fluorescence microscope equipped with the necessary light source and filters is employed to analyze the specimen, where successful antigen-antibody binding is indicated by bright green or orange-yellow fluorescence, signifying a positive test result. For testing HSV type 2, the appropriate code is 87273, while 87274 is designated for HSV type 1.