This question brought to mind Title 21 CFR 660.33:
"Group O Reagent Red Blood Cells used in the detection or identification of unexpected antibodies shall include at least the following common antigens in each lot of the product: D, C, E, c , e, K, k , Fy a, Fy b, Jk a, Jk b, Le a, Le b, P1, M, N, S, and s ."
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=660&showFR=1&subpartNode=21:7.0.1.1.8.4