Hepatitis B Virus Tests: About These Tests
What are they?
Hepatitis B virus tests are blood tests that check for substances (antibodies) in your blood that show
whether you have hepatitis B now or had it in the past. The tests can help tell you if you may have the
disease long-term. It also can show how bad it is and how easily it can be spread. It also can show if you are
protected from getting the disease.
Antibodies can take weeks or months to develop. So a test done early in the infection may show an infected
person doesn't have it.
Why are these tests done?
You may need testing if:
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You have symptoms of hepatitis.
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You may have been exposed to the hepatitis B virus. You are more likely to have been exposed to the virus
if you inject drugs, have many sex partners, or are likely to be exposed to body fluids (such as if you are
a health care worker).
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You've had other tests that show you have liver problems.
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You are pregnant.
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You or your doctor wants to know if you are protected from getting the disease.
The tests also are done to help your doctor decide about your treatment and see how well it's working.
How do you prepare for the test?
In general, there's nothing you have to do before this test, unless your doctor tells you to.
How is the test done?
A health professional uses a needle to take a blood sample, usually from the arm.
What happens after these tests?
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all
appointments, and call your doctor if you are having problems. It's also a good idea to keep a list of the
medicines you take. Ask your doctor when you can expect to have your test results.
Current as of: June 12, 2023
Content Version: 14.0
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