CPT® Code 87550

The CPT® Code 87550 refers to a laboratory test designed for the detection of the infectious agent Mycobacteria species through the use of nucleic acid analysis, specifically targeting DNA or RNA. Mycobacteria species encompass a variety of gram-positive, acid-fast bacteria, which include notable organisms such as M. bovis, M. africanum, M. kansasii, M. gordanae, M. asiaticum, M. gastri, M. malmoense, M. marinum, M. scrofulaceum, M. simiae, and M. szulgai. Infections caused by these species can manifest through a range of symptoms, primarily respiratory illnesses and skin lesions, which are often chronic and progressive in nature. The direct probe technique utilized in this test is specifically designed to identify a unique nucleic acid sequence, known as the target sequence, associated with the Mycobacteria organism, should it be present in a respiratory or tissue sample. This process involves the use of a probe that is labeled with either fluorescent or chemiluminescent markers. The sample undergoes treatment to release nucleic acids from the target organism, allowing the labeled probe to selectively bind to the matching target sequence, thereby forming a stable hybrid. The test often focuses on ribosomal RNA, which is abundant in microorganisms, as opposed to genomic DNA, which is typically present in fewer copies. For enhanced sensitivity, an amplified probe technique, referenced by CPT® Code 87551, may be employed, where the target sequence of Mycobacteria DNA or RNA is exponentially multiplied, often utilizing polymerase chain reaction (PCR) or reverse transcriptase polymerase chain reaction (RT-PCR). This amplification allows for the identification of replicated sequences through labeled DNA probes. Furthermore, CPT® Code 87552 pertains to nucleic acid detection with quantification, which assesses the quantity of microorganisms present by employing quantitative or real-time PCR to amplify the isolated nucleic acid segment and generate detailed reports on the absolute or relative amounts of the known nucleic acid sequence.