AABB emphasized that if we're using GEL method for crossmatching, there should be another method in place to detect IgM ABO incompatiblity (i.e. tube at IS). If our facility has a computer system in place that detects and alerts ABO incompatiblity between the patient and the donor when selecting the unit for crossmatching (part of our electronic crossmatch process), then does that meet this requirement? If possible, please direct me to any references that relates to this topic. Thank you.