The RNA test should not be used for diagnostic purposes. Depending who you listen to, the most conservative conclusive would be a standard antibody test at 3 months.
what i have learned is that it is the most conclusive because viral load goes very high after the infection. viral load tests can detect this infection speacialy if done after 28 days however it has potential to detect much earlier also.
The reason for not using it as diagnostic is that its potential to give false positive and its a very expensive test.
thanks for the link.I got your point, but once infected body itself cannot keep the virus to undetectable level, its still in thousands. and RNA viral load can detect it. Mostly it can detect anything above 400 copies/ml or somethng like that