Hello doctor google when I search for different between 3rd generation and 4th generation for HIV tests I see it.(the 3rd generation tests look for antibodies (the body's immune response), 4th generation tests look for both antigens (proteins from the virus itself) as well as antibodies. This means the fourth generation test is more accurate in a shorter time as it does not only rely on the speed at which the body can generate an immune response) my question is .4th generation how many days are shorter than 3rd generation? Please I really need you to answer.