CPT® Code 87487

The CPT® Code 87487 refers to a laboratory test designed for the detection of the infectious agent Chlamydia pneumoniae through the analysis of nucleic acids, specifically DNA or RNA. Chlamydia pneumoniae is classified as an atypical bacterium that is transmitted from person to person via respiratory secretions. Infections caused by this organism can manifest in various respiratory conditions, including pneumonia, bronchitis, pharyngitis, laryngitis, and sinusitis. The testing process involves a direct probe test, which utilizes a specific nucleic acid sequence known as the target sequence of the C. pneumoniae organism. This target sequence is identified if it is present in the respiratory secretion sample collected from the patient. To facilitate the detection, the probe used in the test is labeled with either fluorescent or chemiluminescent markers. The sample undergoes treatment to release nucleic acids from the target organism, if it exists in the sample. The labeled probe then selectively binds to the matching target sequence, forming a stable hybrid. Ribosomal RNA is often the focus of these tests due to its abundance in microorganisms, typically existing in thousands of copies, compared to the limited presence of genomic DNA, which may only have 1-2 copies. In cases where enhanced sensitivity is required, an amplified probe technique is employed. This method significantly increases the assay's sensitivity by exponentially multiplying the target sequence of C. pneumoniae DNA or RNA into millions of copies. The polymerase chain reaction (PCR) or reverse transcriptase polymerase chain reaction (RT-PCR) are the most commonly utilized amplification techniques. Following amplification, the replicated sequences are identified using labeled DNA probes. The specific procedure denoted by CPT® Code 87487 not only detects the presence of the nucleic acid but also quantifies the amplified sequences, providing valuable information regarding the number of microorganisms present in the sample. Quantitative or real-time PCR is frequently used in this context to amplify the isolated nucleic acid segment and generate a report that documents the absolute or relative amounts of the known nucleic acid sequence.