GP1BA and Bernard-Soulier syndrome: BSS diagnosis is confirmed by Flow cytometric analysis of platelets showing defective binding with CD42a (GPIX), CD42b (GP Ibα), CD42c (GP Ibβ), and CD42d (GPV) antibodies.9 The defective fragments of GP Ib-IX-V complex after separating with sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) may be identified by immunobloating.10