Hepatitis A Antibody Titer

A titer is a laboratory test that measures the amount of antibodies present in a person’s blood. It can be used to determine if a person has had any previous infections, and whether there is a current immunity. Certain employers and guidelines require candidates and employees to undergo titer testing as part of their vaccination policies.

A hepatitis A antibody titer test measures the presence of hep A antibodies which is used to aid the diagnosis of an ongoing infection. It tests both IgM antibodies and IgG antibodies. IgM antibodies are present after an exposure but will fade with time. IgM antibodies remain present in the body and provide immunity for those who have recovered from previous infection or have received a vaccination.