CPT® Code 87641

Infectious agent detection by nucleic acid (DNA or RNA); Staphylococcus aureus, methicillin resistant, amplified probe technique

The CPT® Code 87641 refers to the detection of the infectious agent Staphylococcus aureus, specifically the methicillin-resistant strain (MRSA), through a nucleic acid amplification technique. This method utilizes either DNA or RNA to identify the presence of the pathogen in a sample. The amplified probe technique is a sophisticated diagnostic tool that serves as an alternative to traditional culturing methods, which can be time-consuming and may not always detect low levels of the infectious agent. By employing nucleic acid detection, healthcare professionals can identify infections more rapidly and accurately. The process involves extracting the nucleic acid from the infectious agent's cells and using a specific probe to hybridize with the target DNA or RNA. This probe is designed to bind to the complementary strands of the pathogen's genetic material, allowing for the formation of stable double-stranded complexes. The amplified probe technique enhances sensitivity, enabling the detection of even minimal quantities of the infectious agent, sometimes down to a single organism. This is achieved through methods such as polymerase chain reaction (PCR), which enzymatically replicates specific sequences of the target DNA, thereby amplifying it exponentially. The use of amplification primers, which are short strands of DNA that are complementary to the target DNA, further facilitates this process by ensuring that the polymerase enzyme can effectively copy the desired region, resulting in a significant increase in the amount of detectable genetic material.