Blood Bank BASICS: Rule Outs Made EASY 🩸 Negative reactions means the antibody is not reacting with any of the antigens that are POSITIVE on that particular cell. Those are the cells to do your rule outs from. Match your pattern of reactivity as fast as you can on your ASCP exam and perform rule outs using homozygous cells 📱Comment the word “PASS” on Instagram to pass your ASCP Exam 🧪🥼 | Marilyn Claire