Intralaboratory Quality Control of Hematology: Comparison of Two Systems

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Abstract
Two systems for quality control have been compared, viz., the whole-blood control preparation method and the algorithm method using the geometric moving average B and a new estimator Y. The system involving wholeblood controls has the advantage of simplicity of operation, but the economic cost of commercial preparations is often high. The algorithm system has the advantage that results of all the test samples are used in the calculation; to some extent, this provides a buffer against random variation. The number of count-outs in a given channel is related to the precision of the channel, which in turn is a function of the number of determinations and calculations required for that result. An error of around 1% is introduced into the result each time a calculation is performed. A successful quality control scheme should contain elements of both control preparation and algorithm methods.