Jk(a−b−) red blood cells resist urea lysis

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Abstract
Falsely high automated platelet counts in a patient with aplastic anemia were due to increased resistance of the red blood cells to urea lysis. The patient''s blood group was Jk(a-b-). This phenomenon occurred with all of 8 bloods of the phenotype Jk(a-b-) but not with red blood cells of other phenotypes tested. There is an association of a rare blood group phenotype with unusual red blood cell behavior in vitro.