How accurate is a 5 mins rapid hiv home test (blood) and when is it considered conclusive from last exposure ( wks or mths)?

Screening test: It is a screening test. If it is positive, the result needs to be confirmed by a more definitive test. If the result is negative at less than 6 months after exposure, that does not rule HIV infection and testing needs to continue. See this site for safer sex guidelines: http://www.aids.org/topics/aids-factsheets/aids-background-information/what-is-aids/safer-sex-guidelines/