Hi Scott, I can imagine you (and others) saying, "Well, he would say that, wouldn't he", but the answer is "Yes". The reason I say yes is because this sounds quite an interesting scenario. By that, I mean that the antibody appears to be strengthening, and it would be best to get the specificity sorted out now, than when the antibody finally decides to show its real muscles, just when the patient requires blood in an emergency. From what you say, the reactions appear to give a sort of "mixed-field" reaction, which suggests either an anti-Sda or something within the Lutheran Blood Group System (neither of which are renowned for being clinically significant), BUT, and it's a big BUT, it may not be. So you then have the problem that, 1. if it is, how do you know if there is, or is not, another, this time clinically significant antibody lurking under this clinically insignificant antibody or 2. if it isn't, and the patient needs blood urgently, what do you do, as this antibody specificity on its own may be clinically significant? From the Reference Laboratory's point-of-view, I can tell you that there is nothing that makes us bite through 6 inch nails more than a hospital that knows "there is something there", but hasn't sent it to us to identify, and then requires us to identify the antibody specificity in an emergency situation, when we could have identified the specificity (or, at the vey least, had a go at identifying the specificity) as a "cold" case. Just my slant on things!