PCR (Polymerase Chain Reaction): PCR (polymerase chain reaction) is technique in molecular genetics that analyzes short sequences of DNA or RNA. PCR is used to help doctors diagnose HIV, viruses, and fungi in patients. RT-PCR is a test used to detect and measure RNA.
HIV Testing Human immunodeficiency virus (HIV) is the virus that causes acquired immune deficiency syndrome (AIDS). HIV destroys the body's immune system and leads to AIDS. The Western blot and ELISA are the two types of tests most commonly used to detect HIV infection. There are also at-home HIV tests.