I've been wondering how usual have you seen in your forum that a HIV 4th gen test negative result changes from 4th weeks to 6 weeks. I know that you haven't seen a change from 6 weeks to 3 months, but i've surfed through the posts and haven't seen this question before. I know the official guidelines, that state that conclusive results should be consider after 45 days and in other places says 3 months. But i just to know if "in the field" is a reality that a 4th week negative can probably change later, or if its a rare thing