Immunoglobulins, or antibodies, are produced by white blood cells. They help your body defend against infections and conditions like cancer. Tests measure them and help diagnose these medical ...
Hepatitis A blood tests check for immunoglobulin M (IgM) and immunoglobulin G (IgG) antibodies. An IgG-positive and IgM-negative result may suggest immunity to hepatitis A. A doctor may request a ...
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