2[2]Westgard.J.O.Bumett RW.precision requements for cost-effectire operation of analytical processes[J].Clin Chem,1999,36:1629~1632.
3[3]Westgard J.O westgard web tool:normal medical decision chart www.westgard com.
4[5]Westgard.J.O.Lession MV the decision on method performance;www.westgard.com.
5[7]U.S.Dapartment of Health and human services.Medicare,Medicaid and CLIA.Program:Regulations implementing the Clinical Labora tory.Improvement Amendment of 1988(CLIA).Final rule[S].Fed Regist,1992,57(40):7002~7180.