Brucella antibody test is a serological test that is used to detect the presence of Brucella antibodies in the blood. Such test is done on the blood serum and used to detect not only the antibodies but also the different agents that are responsible for their creation. If you are suffering from the symptoms such as fever, fatigue, muscle pain, joint pain and so on then you may be suffering from acute or chronic Brucellosis. In such cases, the blood test is done to detect the antibodies in the blood.