Hepatitis A Antibody Blood Test, IgM
A Hepatitis A Antibody Blood Test is a differential diagnosis of hepatitis; the presence of IgM antibody to hepatitis A virus is good evidence for acute hepatitis A.
IgM anti-HAV antibodies indicate a recent infection with the hepatitis A virus. IgM anti-HAV antibodies can generally be detected in the blood as early as 2 weeks after the initial HAV infection. The antibodies will disappear from the blood 3 to 12 months after the infection. IgG anti-HAV antibodies indicate that you have had a hepatitis A viral infection. About 8 to 12 weeks after the initial infection with hepatitis A virus, IgG anti-HAV antibodies will appear and will remain in the blood for lifelong protection (immunity) against HAV.
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