HIV is utmost diagnosed disease in the world. This Diagnosis is done by testing blood or saliva for detecting the virus that causes HV. Unfortunately, it takes time for your body to develop these antibodies usually up to 12 weeks. In rare cases, it can take up to six months for an HIV antibody test to become positive. CD 4 count, viral load, drug resistance these tests for know the stage of disease. The following tests to check for additional infections or complications, the tests are Liver and kidney damage, hepatitis.