Hepatitis B Virus Immunoglobulin G (IgG) Antibody, Serum

What Does This Test Measure?

The test detects hepatitis B virus IgG antibodies, which your body produces after being exposed to the virus. Unlike IgM antibodies (which indicate an acute infection), IgG antibodies suggest long-term immunity or past infection. This test is often used to confirm recovery from hepatitis B or assess immunity in high-risk groups.

Why Might You Need This Test?

Your healthcare provider may order this test if you’ve been exposed to hepatitis B, received the hepatitis B vaccine, or have symptoms of liver disease. It’s also used in screening for chronic hepatitis B carriers or evaluating immune response to vaccination.

Preparation for the Test

No special preparation is needed. A blood sample is taken from a vein in your arm. You may feel a slight pinch, but it usually takes only a few minutes. Avoid alcohol or heavy meals before the test if instructed by your provider.

What to Expect After the Test

After the blood draw, you can return to your normal activities immediately. There may be mild bruising or soreness at the injection site, which should resolve within a day or two. Report any unusual swelling, bleeding, or signs of infection (e.g., increased pain, redness, or fever) to your provider.