Hi Tomi There are currently 4 generations of HIV tests. Like all of the approved HIV self tests, the BioSURE HIV test is a 2nd generation test. The generation of the test describes the structure of the test and follows how these tests have developed over time. The generation of the test does not really denote anything about the "quality" of the test, but generally the later the generation of the test the earlier in the process of HIV infection that the test can detect the presence of the virus. However, with rapid point of care tests, like the BioSURE HIV Self Test, generally speaking, the later the generation, the less reliable the test is. 4th generation point of care tests can detect the infection earlier than other tests but are much more likely to give an incorrect result. UK clinical guidelines require all HIV point of care tests, so that's self tests and those provided in GUM/sexual health clinics to advise that the test might not detect HIV infections that have occurred within the past 3 months. So regardless of what clinic evidence we might have about how early the BioSURE HIV Self Test COULD detect the presence of HIV, we stick to the guidelines and don't make any claims that don't fall strictly within those. I hope that helps to answer your question. If you require any further information please don't hesitate to ask. Kind regards Gary Carpenter BioSure (UK) Limited