:cries:Has anyone read the summary of Ask the FDA 2010 on the AABB web site? One question that was asked was: does gel crossmatching satisfy the reqirement to test for ABO incompatibility? The FDA said no, because gel does not detect all IgM antibodies. I retested this, and found that gel detected all ABO incompatibilities. Does anyone also do immediate spin or electronic crossmatches when doing gel crossmatches for patients that have IgG antibodies???