title: Inconsistent leukocyte removal by IBM 2991 blood cell processor.
abstract: Studies done in the 1970's have documented the efficiency of leukocyte removal by saline washing using the IBM 2991 Blood Cell Processor. In June 1982, an evaluation of 52 consecutive units washed using the IBM 2991 yielded results for leukocyte removal that varied considerably from the results determined by previous published studies. Evidence from our institution and others within the last year supports a recent alteration in the ability of the IBM 2991 to remove leukocytes. Since the machine has not changed considerably since previous successful studies, alterations in the product being washed need to be considered as a cause of the inconsistency in leukocyte removal by the IBM 2991. Until consistent leukocyte-removal can be achieved, individual blood banks should carefully scrutinize their washed units and be prepared for possible leukocyte-associated reactions.
mesh_terms: D001771:Blood Banks; D002469:Cell Separation / Q000295:instrumentation*; D006801:Humans; D007962:Leukocytes; D011786:Quality Control