CPT® Code 87485

The CPT® Code 87485 refers to a laboratory test designed to detect the infectious agent Chlamydia pneumoniae through the use of nucleic acid detection techniques, specifically targeting 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 procedure utilizes a direct probe technique, which involves identifying a unique nucleic acid sequence known as the target sequence that corresponds to the C. pneumoniae organism, should it be present in the respiratory secretion sample collected from the patient. During the test, the sample undergoes treatment to release nucleic acids from the target organism, if it exists. A labeled probe, which may be tagged with fluorescent or chemiluminescent markers, is then introduced to the sample. This probe is designed to specifically bind to the target sequence, forming a stable hybrid when a match is found. The test often focuses on ribosomal RNA, as it is typically found in high quantities within microorganisms, making it a more reliable target compared to genomic DNA, which is usually present in fewer copies. For enhanced sensitivity, an amplified probe technique, referenced by CPT® Code 87486, can be employed, which involves exponentially multiplying the target sequence of C. pneumoniae DNA or RNA into millions of copies. The most prevalent amplification methods include polymerase chain reaction (PCR) and reverse transcriptase polymerase chain reaction (RT-PCR). Following amplification, the replicated sequences are identified using labeled DNA probes. Additionally, CPT® Code 87487 pertains to nucleic acid detection with quantification, which assesses the number of microorganisms present by employing quantitative or real-time PCR techniques. This approach allows for the amplification of the isolated nucleic acid segment and generates reports at each stage to document the absolute or relative amounts of the known nucleic acid sequence detected in the sample.