We have also seen positive reactions spinning down to negative when respinning the plasma again, the gel card while finishing a second screen on a new patient on the same card. We have found that anything truly positive does not spin away. The positive reactions we had that spun away were either rouleaux or a non specific cold agglutinin. We have also found that any agglutination, no matter how little, is an antibody. Even some times with Antibody screening , the same issue