Serologic tests are blood tests that look for antibodies in your blood. They focus on the immune system, a vital organ that generates proteins. It studies the antibodies and other elements of serum (clear liquid part of the blood).
Serology tests look for antibodies in the blood to detect whether a person has been exposed to a virus or other infectious agents. Serology tests can determine weather you have immunity against certain sexual diseases, respiratory diseases, and liver diseases.