Test Detail

Hepatitis B surface Antigen (HBsAg) by ELISA

An Hepatitis B surface Antigen (HBsAg) by ELISA test detects the presence of the HBsAg in a patient's blood, indicating an infection with the Hepatitis B virus (HBV). It's a solid-phase enzyme-linked immunosorbent assay that uses a sandwich immunoassay principle to identify the antigen, with the intensity of the resulting color reaction being proportional to the amount of HBsAg present. A positive result from this confirmatory test requires further investigation to determine if the infection is acute or chronic.