Therapy for low high-density lipoprotein cholesterol in the face of 'desirable' levels of total cholesterol.

dictive value for subsequent compatibil¬ ity. In circumstances where the anti¬ body screen is positive, however, additional testing becomes necessary. The antibody expressed in the recipi¬ ent's serum must be characterized and the donor red blood cells tested for the presence of the corresponding antigen. The process of characterizing donor red blood cells as to their expression ofa particular antigen or antigens is no less time-consuming than the crossmatch and requires expensive typing serum samples. Simultaneous crossmatching of an appropriate number of type-spe¬ cific units at the same time is more costeffective. The procedures are thus com¬ plementary and not at all substitutable in certain situations. The crossmatch has been considerably abbreviated at many institutions over the years, but has yet to become outmoded. The re¬ lationship is thus not so obviously old/new, outmoded/state-of-the-art for these two procedures, as is the case with the other four paired studies, which may in part explain this pair's relatively weak statistical performance in the authors' analysis.