RT Journal Article SR Electronic T1 Variable Hemagglutination Reactions with Ulex europaeus Lectin and Group O Erythrocytes JF American Society for Clinical Laboratory Science JO Clin Lab Sci FD American Society of Chemistry and Laboratory Science SP 12 OP 16 DO 10.29074/ascls.2018000638 VO 31 IS 1 A1 Rhees, Justin R. A1 Hall, Caden M. YR 2018 UL http://hwmaint.clsjournal.ascls.org/content/31/1/12.abstract AB Group O red blood cells (RBCs) express the highest amount of H antigen of any other blood group and are therefore 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.