Testing for the presence of IgM antibodies to hepatitis A is done if you have the symptoms.A HAV IgG antibody or total HAV antibody can be done in some cases following exposure to this virus.If you are being considered for the HAV vaccine, a HAV IgG antibody or total HAV antibody test may be requested before you are given the vaccine to see if you need it (if the antibodies are already present, the vaccine won’t help you). Once you have completed the two doses of the vaccine, the HAV IgG antibody or total HAV antibody test can also be used to see if you have responded to the vaccine.
