Distinct immunohematologic features of the 5 most frequent weak D types.

The RhD antigen density is plotted on the ordinate. On the abscissa, the ratio of RhD epitopes detected by the 2 monoclonal anti-Ds, BS227 and BS229, is shown. Data of 74 weak D samples are shown. •: weak D type 1, n = 25; ○: weak D type 2, n = 24 (only 23 different positions are discernible because 2 samples overlapped); ×: weak D type 3, n = 12; ▪: weak D type 4.0, n = 7; Δ: weak D type 5, n = 6.