Does anyone have a policy they'd share regarding when it's okay to not repeat an AB ID on a repeat patient with a known antibody. I have a patient who comes in every week for blood. A+ with an anti-K since 2003. I worked up the antibody everytime at the beginning, then was told about a policy I could implement and not work it up every time. Before I implemented it, her screen went negative and stayed that way for the last several years. Well, all of the sudden, her screen is positive again. The reactions are consistant and there's no other antibody. If it's possible to not work this up every week, I'd love it know how to properly word a policy.