CPT® Code 87797

The CPT® Code 87797 refers to a laboratory test designed for the detection of infectious agents through the analysis of nucleic acids, specifically DNA or RNA. This procedure is categorized as "not otherwise specified" (NOS), indicating that it can be applied to a variety of infectious organisms that are not explicitly listed. Examples of such organisms include West Nile Virus, Human T-Lymphotropic Virus, Epstein Barr Virus, BK Virus, Adenovirus, Hepatitis E Virus, Parvovirus B19, and Human Herpesvirus 8. The test employs a direct probe technique, which involves identifying a unique nucleic acid sequence known as the target sequence that corresponds to the suspected infectious agent. This target sequence is sought within samples derived from blood, tissue, or other bodily fluids. To perform the test, the sample is treated to release nucleic acids from the target organism, if it is present. A labeled probe, which may utilize fluorescent or chemiluminescent markers, is then introduced to the sample. This probe is designed to bind specifically to the target sequence, forming a stable hybrid if the sequence is present. The method often targets ribosomal RNA, as it is typically found in high quantities within microorganisms, making it a reliable indicator for detection. In contrast, the amplified probe technique, represented by CPT® Code 87798, enhances the sensitivity of the assay by exponentially amplifying the target sequence of the organism's DNA or RNA, resulting in millions of copies. The polymerase chain reaction (PCR) or reverse transcriptase polymerase chain reaction (RT-PCR) is the most frequently utilized amplification method. Following amplification, the replicated sequences are identified using labeled DNA probes. Furthermore, CPT® Code 87799 pertains to nucleic acid detection that includes quantification, allowing for an assessment of the number of microorganisms present in the sample. This quantitative approach often employs real-time PCR to amplify the nucleic acid segment and generate detailed reports on the absolute or relative amounts of the identified nucleic acid sequence.