CPT® Code 87637

Infectious agent detection by nucleic acid (DNA or RNA); severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]), influenza virus types A and B, and respiratory syncytial virus, multiplex amplified probe technique

The CPT® Code 87637 refers to a diagnostic procedure that utilizes a multiplex amplified probe technique for the detection of specific infectious agents, namely severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), influenza virus types A and B, and respiratory syncytial virus (RSV). This advanced testing method is particularly significant in the context of respiratory illnesses, as it allows for the simultaneous identification of multiple viruses from a single patient sample. The procedure is designed to detect even minute quantities of viral genetic material, which is crucial for accurate diagnosis, especially when the presence of the virus is low. The process begins with the collection of a respiratory sample, which can be obtained through various methods such as swabbing the nose or throat, or through more invasive techniques like bronchoalveolar lavage. Once the sample is collected, it undergoes a series of chemical treatments to isolate the RNA, which is then reverse transcribed into DNA, as the amplification process requires DNA. The use of oligonucleotide probes and primers, which are tagged with fluorescent markers, allows for the specific targeting and amplification of the viral DNA. This amplification is achieved through a series of cycles in a real-time reverse transcription-polymerase chain reaction (RT-PCR) machine, where the amount of DNA doubles with each cycle. The fluorescent markers provide real-time feedback on the amplification process, enabling the detection of the virus when a certain fluorescence threshold is reached. This method not only confirms the presence of the virus but also aids in assessing the severity of the disease based on the number of cycles required to achieve this confirmation. Overall, this procedure plays a critical role in the management of respiratory illnesses, guiding treatment decisions and public health measures.