I think what I said last time is that you should get your own copy of the results and make sure that your result wasn't "615" instead of "634", because sometimes these results get mis-read or misinterpreted as they are passed from lab to nurse to patient. Did you get your own copy?
But assuming that you did a BDNA Quant with a sensitivity of 615 IU/ml, then you are positive, and yes, if the result was under 615 IU/ml (the tests limit) then you would be considered negative. However, that wouldn't mean you necessarily were negative, just negative to the sensitivity of the test. For a more meaningful negative, I suggest you take a test like Quest Diagnositic's "Heptimax" that goes down to 5 IU/ml.
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