The Hepatitis A virus Total (HAV-IgG) test is a blood test that detects the presence of IgG antibodies against the Hepatitis A virus. Unlike the HAV-IgM test, the HAV-IgG test does not diagnose acute Hepatitis A infection. Instead, it indicates whether a person has been exposed to the virus in the past and has developed immunity to it. The IgG antibodies are produced by the body in response to a previous Hepatitis A infection or as a result of vaccination. The test is commonly used to screen individuals who are at risk of exposure to Hepatitis A, such as healthcare workers, food handlers, and travelers to endemic areas. A positive HAV-IgG test result indicates that the person has either had a previous Hepatitis A infection or has been vaccinated against the virus. The HAV-IgG test is also useful in monitoring the effectiveness of the Hepatitis A vaccine and determining whether a booster dose is necessary.