PT - JOURNAL ARTICLE AU - Rhees, Justin R. AU - Hall, Caden M. TI - Variable Hemagglutination Reactions with Ulex europaeus Lectin and Group O Erythrocytes AID - 10.29074/ascls.118.000638 DP - 2018 Jan 01 TA - American Society for Clinical Laboratory Science PG - ascls.118.000638 4099 - http://hwmaint.clsjournal.ascls.org/content/early/2018/06/25/ascls.118.000638.short 4100 - http://hwmaint.clsjournal.ascls.org/content/early/2018/06/25/ascls.118.000638.full AB - Group O red blood cells (RBCs) express the highest amount of H antigen of any other blood group and, therefore, are expected to demonstrate strong reactivity when tested with Ulex europaeus anti-H lectin, unless the RBCs are from individuals possessing the Bombay or para-Bombay phenotypes. We report several examples of group O RBCs not belonging to the aforementioned groups that consistently produced weak reactions with quality-controlled Ulex europaeus lectin.