A hepatitis A virus (HAV) antibody blood test is a laboratory test that measures the level of antibodies to the HAV in the blood. Antibodies are proteins produced by the immune system in response to infection or vaccination. The test is used to determine whether a person has been infected with the HAV and has developed immunity to the virus. A positive test result indicates that the person has been infected with the virus and has developed immunity, while a negative result may indicate a need for vaccination or further testing.
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