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There is no reason to get a RNA test to confirm (unless you really want to).
The RNA testing is more helpful if you have had a very recent exposure (the past 3 weeks).
But if your exposure was more than 3 weeks ago -- the 4th generation test is going to be very accurate.
The positive on RNA, and negative on the antibody is within that "window" period -- often 5-21 days after exposure.
But you're way beyond that, and at 90 days, you're essentially 99.9+% accurate with the result.
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If the 4th generation is negative -- the RNA is going to be negative.