Herein lies the real issue. Biology is a very, very messy science. So yes it could just be a testing error. But it might not be. It might be that something in y

Herein lies the real issue. Biology is a very, very messy science. So yes it could just be a testing error. But it might not be. It might be that something in your body behaves in a way that's unexpected. It might be some other non-dangerous anomaly as you cite. We understand far more than we did say 20 years ago. But the problems are non-trivial on a scale most people don't appreciate.