CPT® Code 87279

The CPT® Code 87279 refers to a laboratory test that utilizes an immunofluorescent technique to detect the presence of human parainfluenza virus (HPIV) antigens in fluid samples obtained from the nasopharynx or trachea. This test specifically identifies the four serotypes of HPIV: HPIV-1, HPIV-2, HPIV-3, and HPIV-4. Parainfluenza viruses are significant pathogens, particularly in infants, children, older adults, and individuals with compromised immune systems, as they are known to cause a range of respiratory infections. HPIV-1 is primarily associated with croup and upper and lower respiratory illnesses, predominantly affecting infants and children, while HPIV-2 can lead to similar respiratory symptoms across all age groups. HPIV-3 is often linked to more severe conditions such as bronchiolitis, bronchitis, and pneumonia. HPIV-4, the least prevalent serotype, can cause respiratory illnesses that vary in severity. Symptoms of an HPIV infection typically include fever, runny nose, and cough, which generally last between 7 to 10 days. The transmission of the virus occurs through respiratory droplets and contact with contaminated surfaces. During the testing process, a nasopharyngeal or tracheal aspirate or washing is collected and treated with a detecting reagent that contains antibodies specific to the HPIV serotypes. This mixture is then examined under an epifluorescence microscope, where a color change indicates the presence of the virus. While this immunofluorescent test is quicker than reverse transcription-polymerase chain reaction (RT-PCR), it may be less sensitive in detecting the virus.