Hepatitis B Core Antibody, Serum (Qualitative)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of hepatitis B, such as fatigue, nausea, or jaundice, or if you’ve been exposed to the virus. It’s also used during screening for hepatitis B in high-risk groups, like those with multiple sexual partners or those who inject drugs. Sometimes, it’s part of routine testing for people who live with someone who has hepatitis B.

What to Expect Before the Test

No special preparation is needed. You’ll typically have a small needle inserted into your arm to draw a blood sample. The process takes a few minutes, and you may feel a brief pinch. If you’re nervous, let your healthcare provider know—they can offer ways to make it more comfortable.

What the Test Results Mean

If your test is positive for hepatitis B core antibodies, it means your immune system has encountered the virus at some point, either through infection or vaccination. However, a positive result doesn’t always mean you’re currently infected—it could indicate immunity from past exposure. If you’re unsure about your vaccination status, ask your provider for clarification.

Possible Results and Next Steps

A positive result may prompt further testing, such as checking for hepatitis B surface antibodies (HBsAb) or hepatitis B surface antigen (HBsAg), to determine if you’re currently infected or immune. If you’re at risk for hepatitis B, your provider may recommend ongoing monitoring or preventive measures.