检验系统精密度和准确度在用户端的确认ClinicalandLaboratoryStandardsInstitute(CLSI)-UserVerificationofPerformanceforPrecisionandTruenessEP15-A2精密度实验(PrecisionExperiment)准确度—临床标本比对实验(ComparisonofPatientSamplesExperiment)准确度—用已定值标准物质检验(DemonstrationofTruenessWithReferenceMaterials)精密度实验(PrecisionExperiment)重复性sr(RepeatabilityStandardDeviation)总不精密度sl(With-laboratoryStandardDeviation)例一:葡萄糖(Glucose)浓度(C)=140mg/dL;标示精密度(claimed):σr=1.0mg/dL;σl=2.0mg/dL;实验数据处理及详解实验数据处理及详解()=(140+138.33+143.67+142.67+142)÷5=141.33计算总体均值(GrandMean):(Sr)重复性(RepeatabilityStandardDeviation)=(0+0.3334+0.3334+0.3334+1)÷5=0.400041、2、=0.632<1mg/dL计算扩展σrv:自由度(DegreesOfFreedom)C:自由度为10置信度为97.5%卡平方分布值()扩展σr=(Verificationvalue)σr=1(mg/dL);v=10;C=20.48=1.431∵sr=0.632<1.431;∴可以认为待验重复性(sr)与标示的重复性(claimed)σr保持一致,待验系统重复性(sr)被证实。(结论)(Sl)总不精密度(With-laboratoryStandardDeviation)=((140-141.33)2+(138.33-141.33)2+(143.67-141.33)2+(142.67-141.33)2+(142-141.33)2)÷4=4.622251、sr=0.632;(Sl)总不精密度(With-laboratoryStandardDeviation)2、=SQRT(2÷3×0.40004+4.62225);=2.21>2mg/dL计算扩展σlT:合成自由度(DegreesOfFreedom)C:自由度为4置信度为97.5%卡平方分布值()扩展σl=(Verificationvalue)σl=2(mg/dL);T=4;C=11.14;D=5=3.16∵sl=2.21<3.16;∴可以认为待验重复性(sl)与标示的重复性(claimed)σl保持一致,待验系统重复性(sl)被证实。(结论)=4.47Theoperatingcharacteristiccurve准确度—临床标本比对实验(ComparisonofPatientSamplesExperiment)例二:1、葡萄糖(glucose)标示偏倚(claimedbiasorpercentbias):不超过2.0mg/dL(C=126mg/dL)2、γ-谷氨酰转移酶(γ-GlutamylTransferase)标示偏倚(claimedbiasorpercentbias):不超过2%(U/L)3、尿素(urea)标示偏倚(claimedbiasorpercentbias):不超过2%(mmol/L)1、葡萄糖实验数据处理及详解计算偏差及相对偏差(biasandpercentbias)=50÷20=2.5>2mg/dL=SQRT(357÷19)=4.33=47.22÷20=2.36%=SQRT(346.08÷19)=4.27%计算扩展(Verificationlimits–bias)t:自由度为19置信度为99%的单尾T分布值“2.539”=4.33;n=20=2.0±2.46=[-0.46、4.46]∵=2.5<4.46;∴可以认为待验系统与标示保持一致,待验系统准确性被证实。(结论)Verificationlimits(bias)=Theoperatingcharacteristiccurve2、γ-谷氨酰转移酶实验数据处理及详解(U/L)计算偏差及相对偏差(biasandpercentbias)=32.5÷20=1.625=SQRT(73.97÷19)=1.973=29.62÷20=1.481%<2%=SQRT(33.495÷19)=1.328%待验系统偏差小于标示,准确性被证实3、尿素实验数据处理及详解(mmol/L)计算偏差及相对偏差(biasandpercentbias)=8.44÷20=0.42=SQRT(1.14÷19)=0.244=103.5÷20=5.175%>2%=SQRT(41.887÷19)=1.485%计算扩展(Verificationlimits–bias)t:自由度为19置信度α=1%的单尾T分布值“2.539”=1.485%;n=20=2%±0.843%=[1.157%、2.843%]∵=5.175%>2.843%;∴不能认为待验与标示保持一致,应在结果中
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此差异。(结论)Verificationlimits=(percentbias)准确度—用已定值标准物质检验(DemonstrationofTruenessWithReferenceMaterials)例三:葡萄糖(Glucose)定值标物浓度(C)=40mg/dL;n=135组实验室独立平行定值标准差(speergroup)=1.73mg/dL;实验数据处理及详解1、=37.7(mg/dL)2、=3773、=0.94、=0.949计算扩展(Verificationinterval)t:自由度为9置信度为α=1%的单尾T分布值“2.821”=1.73;标物浓度(assignedvalue)=40=37.7±2.71=[34.99、40.41]∵34.99<(assignedvalue)=40<40.41;∴可以认为待验系统测定结果与标物已定值保持一致,待验系统准确性被证实。(结论)=0.419;sx=0.949Verificationinterval=