HIV Antibody/Antigen Combo(HIV Ab/Ag Combo) CLIA kit (Chemiluminescence Immunoassay) is an in vitro diagnostic quantitative test kit that detects both HIV antibody and HIV antigen. The human immunodeficiency virus (HIV) is the causative agent of acquired immunodeficiency syndrome (AIDS) and has been a major global burden for over four decades. It enables health care providers to diagnose HIV infection earlier allowing individuals to seek medical care sooner.