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Antibody blood tests look for antibodies in your system. Having these antibodies means your immune system is built to protect against certain germs, and you are unlikely to get reinfected by that same germ in the future. The time for protection depends on several factors, including the type of virus or bacteria.
Different serology tests can test for various antibodies, but your body mainly produces these five antibody proteins:
- Immunoglobulin A (IgA)
- Immunoglobulin D (IgD)
- Immunoglobulin E (IgE)
- Immunoglobulin G (IgG)
- Immunoglobulin M (IgM)
Antibody tests can test for a variety of autoimmune disorders, bacterial and viral infections, and even allergies or cancer, such as:
- Celiac disease
- Lyme Disease
- Multiple Myeloma
A positive test result means antibodies in your blood are currently protecting you from that particular germ.