We don't do elutions to confirm ABO HDN, which is why I don't think I've ever used the Lui for a patient test. If Mom is type O with a negative antibody screen and baby is A or B with positive DAT, it's presumptive for ABO HDN. If there was evidence indicating that something else was going on (significant anemia, elevated bili that seems atypical for ABO HDN, etc.) we would investigate further. It is possible to use Elu-Kit II on a small sample, though we usually have cord blood to work with, so that is the method we would use for that extended investigation to make sure that we aren't dealing with a non-ABO antibody.
My students have mixed success with the Lui, but we do it anyway. Hands on with methods like that seems to really help them understand the written material they are given.