CPT® Code 87552

The CPT® Code 87552 refers to a laboratory test designed for the detection of the infectious agent Mycobacteria species through the analysis of nucleic acids, specifically DNA or RNA. Mycobacteria species encompass a variety of gram-positive, acid-fast bacteria, including notable strains 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 organisms can lead to a range of symptoms, which may vary based on the specific species involved. Common manifestations include respiratory illnesses and skin lesions, often characterized by a chronic and progressive nature. The testing process involves a direct probe test, which identifies a unique nucleic acid sequence known as the target sequence of the Mycobacteria organism, provided it is present in the respiratory or tissue sample collected. This probe is labeled with either fluorescent or chemiluminescent markers to facilitate detection. The sample undergoes treatment to release nucleic acids from the target organism, allowing the labeled probe to specifically bind to the matching target sequence, forming a stable hybrid. Ribosomal RNA is frequently the focus of these tests due to its abundance in microorganisms, as it exists in thousands of copies compared to the limited 1-2 copies found in genomic DNA. To enhance the sensitivity of the assay, an amplified probe technique is employed, which exponentially increases the target sequence of Mycobacteria DNA or RNA into millions of copies. The polymerase chain reaction (PCR) or reverse transcriptase polymerase chain reaction (RT-PCR) is the most commonly utilized amplification method. Following amplification, the replicated sequences are identified using labeled DNA probes. The nucleic acid detection process, particularly with quantification, provides a measure of the number of microorganisms present in the sample. Quantitative or real-time PCR is often utilized to amplify the isolated nucleic acid segment, generating reports at each stage to document the absolute or relative amounts of the known nucleic acid sequence.