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Articles

Applying sigma metrics to assess quality control processes in the transfusion transmissible infection screening laboratory of a blood center

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By Sonu Bhatnagar, Abbott Laboratories, Sten Westgard, Westgard QC
| PLOS ONE
Imprecision was assessed from the positive Kit controls run daily for each month. Three-month imprecision values were used to calculate average imprecision. The CV% was determined using the following formula: Since there is no universally accepted gold standard or true reference method, it is difficult to obtain an accurate bias estimate. Thus, Sigma was calculated simply as the ratio of TEa% to CV% [14].
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