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Home > Health Library > Hepatitis A Virus Test
The hepatitis A virus test is a blood test that shows if you have a hepatitis A infection now or had it in the past.
The test looks for antibodies made by the body to fight the virus. They will be in your blood if you have a hepatitis A infection now or have had one in the past.
These can be found as early as 2 weeks after you are first infected. They disappear 3 to 12 months after the infection.
These appear 8 to 12 weeks after you are first infected. They stay in your blood and protect you from hepatitis A permanently.
You may need these tests if:
In general, there's nothing you have to do before this test, unless your doctor tells you to.
A health professional uses a needle to take a blood sample, usually from the arm.
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
If you are tested soon after you were infected with hepatitis A, the test may show that you don't have the disease even when you have it. This is because hepatitis A antibodies can take weeks to develop. They may not be in your blood yet.
No hepatitis A virus antibodies are found.
Hepatitis A antibodies are found. You may need more tests to find out if you have an active infection now or a past infection that got better.
Current as of:
September 23, 2020
Author: Healthwise StaffMedical Review: E. Gregory Thompson MD - Internal MedicineAdam Husney MD - Family MedicineW. Thomas London MD - Hepatology
Current as of: September 23, 2020
Author: Healthwise Staff
Medical Review:E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & W. Thomas London MD - Hepatology
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