CPT® Code 86409

The CPT® Code 86409 refers to a laboratory test that measures the presence and activity of neutralizing antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for coronavirus disease (COVID-19). This test is particularly significant in evaluating a person's immune response following infection with the virus or after vaccination. It is commonly utilized to assess the eligibility of plasma donors who have recovered from COVID-19, as their plasma may contain antibodies that can be beneficial for treating patients currently infected with the virus. The neutralizing antibody test specifically quantifies the ability of these antibodies to inhibit the virus's ability to infect cells, providing insight into the level of protection an individual may have against future infections or reinfections. The process involves mixing blood serum or plasma with target cells and a synthetic virus that expresses the spike protein of SARS-CoV-2. By performing serial dilutions and measuring the luminescent signal generated in response to viral infection, healthcare professionals can determine the titer, or concentration, of neutralizing antibodies present in the sample. This information is crucial for understanding an individual's immune status and potential protection against COVID-19.