We discovered at AABB that we are not meeting a CAP requirement for QC. Seems CAP requires ABSC QC to react 1-3+. We perform ABSC in gel, use 3% Ortho Surgiscreen diluted to 0.8% daily, and QC the system with Ortho Confidence system anti-sera (contains anti-D, -c). Our QC reactions are consistantly 4+. So, I've been playing around with dilutions trying to find the one that will give us a 1-3+ reaction. Unfortunately, the dilution that gives a 3+ reaction with the anti-c gives a negative reaction with anti-D. Has anyone out there been sited by CAP for this? Does anyone out there uses this same setup? Is anyone diluting their antisera. Am I going completely mad? Mindy