I too am wondering the purpose, we typically due our DAT in the gel, tubes every once in a while (using Immucor reagents), very rare. If we get this request we send it off. Not too many, only a couple in the last few years. Never had them come up positive using the "super" method. We are just trying to do a little study to see if the DAT vs. the Super DAT vs. Gel method...any difference or a waste of money/time.