Human immunodeficiency virus(HIV) is the virus that causes AIDS.This virus may be passed from one person to another when infected blood,serum or vaginal secretions come in contract with an uninfected person's broken skin or mucous membrane. In addition, infected pregnant women can pass HIV to their baby during pregnancy or delivery as well as through breast feeding. The test  employs sandwich dye conjugate immunoassay to detect the anti HIV antibody in the serum or plasma.