Quality Assurance for Multichannel Hematology Instruments: Four Years’ Experience with Patient Mean Erythrocyte Indices

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Abstract
Experience using the Bull patient moving average control system over a four-year period to control a Coulter® multichannel hematology counting system is described. The system allowed the abandonment of commercial control materials at an annual saving of almost $3,000 without any deterioration in the quality of laboratory data generated. Guidelines for instrument trouble shooting are outlined. A catalog of all major control problem episodes that occurred during the four-year period is included.