CPT® Code 87467

Quantitative hepatitis B surface antigen (HBsAg) testing is a laboratory procedure that measures the concentration of hepatitis B surface antigen in a patient's blood. This antigen is a protein produced by the hepatitis B virus (HBV) and is an important marker for diagnosing and monitoring hepatitis B infection. The test is performed using various immunoassay techniques, including enzyme immunoassay (EIA), enzyme-linked immunosorbent assay (ELISA), fluorescence immunoassay (FIA), and immunochemiluminometric assay (IMCA). The quantitative aspect of the test provides valuable information regarding the viral load, which is crucial for assessing the effectiveness of treatment in patients with chronic hepatitis B. By determining the amount of HBsAg present, healthcare providers can evaluate a patient's response to antiviral therapies, such as peginterferon alfa-2a, and make informed decisions about continuing, adjusting, or discontinuing treatment based on the likelihood of achieving a virological response. This test is typically utilized for patients who have already been diagnosed with hepatitis B, allowing for ongoing management of their condition.