HIV Gen4 relies on advanced method that has capability to detect both antibodies and P24 antigens that are viral proteins. It is known to have higher sensitivity as compared to 3rd generation test. This kit is admired for having ability to detect presence of HIV at very early stage. It is capable of detecting P24 proteins that are in abundant amounts in human blood serum in case of infection. HIV Gen4 can easily detect antibodies even when they are in very low amounts. It is also known as combined ELISA antigen-antibody test and can show highly accurate results just after 3 to 4 weeks of exposure.