最新如何实现不同检测系统检验结果的可比性-张秀明ppt课件.ppt
如何实现不同检测系统检如何实现不同检测系统检验结果的可比性验结果的可比性-张秀明张秀明学习和讨论要点o定义和术语o分析质量指标的设定o可报告范围核实实验o精密度核实实验o比对试验设计方案要点o不同检测系统检验结果可比性的评估o自建检测系统的校准方法检验程序的质量保证o5.6.5 当确实无正式的实验室间比对计划可供利用时,实验室应建立机制,用于决定未经其他方式评估程序的可接受性。o5.6.6 当同样的检验应用不同程序或设备,或在不同地点进行,或以上各项均不同时,应有确切机制以验证在整个临床适用区间内检验结果的可比性。o5.6.7 实验室应文件化并记录比对活动,只要适用,针对其结果迅速采取措施。对识别出的问题或不足应采取措施并保留记录。实现可比性的大体步骤o设定分析质量指标o核实检测系统的主要分析性能n病人结果可报告范围n检测系统的精密度n检测系统的准确度o方法学比较试验o临床可接受性能评价o自建检测系统的校准分析质量指标斯德哥尔摩协议(Scan J Clin Lab Invest 1999,57:475-585)IFCC/IUPAC/WHO三机构于1999年4月在瑞典斯德哥尔摩举办的“建立全球检验医学质量技术要求的策略会议”上提出了“一致性声明”,明确了设定分析质量指标的方法。分析质量指标包括允许不精密度、允许偏差和允许总误差。根据管理法规设定分析质量指标o准确及时 优质服务 科学管理 持续改进o确保参加卫生部临检中心组织的室间质评项目95%以上PT成绩在CLIA88允许误差范围(100分)和/或VIS成绩优秀,确保常规生化、血细胞分析、出凝血检验等项目在不同检测系统间的相对偏差1/2 CLIA88,批内不精密度1/4CLIA88,日间不精密度1/3CLIA88。o追求批内不精密度、日间不精密度、不同检测系统间的系统误差 1/6 CLIA88。根据生物学变异设定分析质量指标o生物学变异或称生理变异(CVB),包括个体内变异(CVI)及个体间变异(CVG),也就是通常所说的生理波动。o人群的生物学变异=(CVI2+CVG2)1/2o根据生物学变异可导出临床检验项目的允许不精密度、允许偏倚和允许总误差。分析质量指标o分析变异的质量指标nCVA0.25CV1,理想nCVA0.50CV1,合适nCVA0.75CV1,低限o分析偏差的质量指标nBA 0.125(CVG2+CV12)1/2,理想nBA 0.250(CVG2+CV12)1/2,合适nBA 0.375(CVG2+CV12)1/2,低限分析质量指标o允许总误差:总误差(TE)是各种类型的随机误差(RE)和系统误差(SE)的总和。所选用的检测系统或方法的总误差必须在临床可接受的水平范围内,即允许总误差(TEa)。o质量指标 TEa1.65(0.25CV1)+0.125(CV12+CVG2)1/2,理想 TEa1.65(0.50CV1)+0.250(CV12+CVG2)1/2,合适 TEa1.65(0.75CV1)+0.375(CV12+CVG2)1/2,低限Analyte CVw CVg I(%)B(%)TE(%)a-Amylase(pancreatic)11.7 29.9 5.98.017.7Activated partial thromboplastine time 2.78.61.42.34.5Alanine aminotransferase 24.3 41.612.212.032.1a-Fetoprotein 12.046.06.011.912.8Albumin 3.14.21.61.33.9Alkaline phosphatase 6.4 24.83.26.411.7Apolipoprotein A1 6.513.43.33.79.1Apolipoprotein B 6.922.83.56.011.6Aspartate aminotransferase 11.917.96.05.415.2Bilirubin total 25.630.512.810.031.1Analyte CVw CVg I(%)B(%)TE(%)Bilirubin conjugated 36.8 43.218.414.244.5CA 125 antigen 29.248.214.614.138.2CA 15.3 antigen 5.742.92.910.815.5CA 19.9 antigen 24.593.012.324.044.3Calcium 1.92.81.00.82.4Carcinoembryonic antigen 12.755.66.414.324.7Chloride 1.21.50.60.51.5Cholesterol 6.014.93.04.09.0C3 complement 5.215.62.64.18.4C4 complement 8.933.44.58.616.0C Peptide 9.313.34.74.111.7Analyte CVw CVg I(%)B(%)TE(%)C-Reactive protein 52.684.426.324.968.3Creatine kinase 22.840.011.411.530.3Creatine kinase MB 19.724.39.97.824.1Creatinine 4.312.92.23.46.9Erythrocites,count 3.26.11.61.74.4Fibrinogen 10.715.85.44.813.6Free thyroxine(FT4)7.612.23.83.69.9Free Triiodothyronine7.94.0g-glutamyltransferase 13.841.06.910.822.2Glucose 5.76.92.92.26.9Hemoglobin 2.86.61.41.84.1Analyte CVw CVg I(%)B(%)TE(%)Hemoglobin A1 C 1.94.01.01.12.7HDL cholesterol 7.119.73.65.211.1Immunoglobulin A 5.435.92.79.113.5Immunoglobulin G 4.516.52.34.38.0Immunoglobulin M 5.947.33.011.916.8Insulin 21.158.310.615.532.9Lactate dehydrogenase 8.614.74.34.311.4Leukocytes,count 10.919.65.55.614.6LDL Cholesterol 8.325.74.26.813.6Lipoprotein(a)8.585.84.321.628.8Mean corpuscular hemoglobin(HCM)1.65.20.81.42.7Analyte CVw CVg I(%)B(%)TE(%)Mean corpuscular hemoglobin concentration1.72.80.90.82.2Mean corpuscular volume1.34.80.71.22.3Myoglobin 13.929.67.08.219.6pCO2 4.85.32.41.85.7pH H+3.52.01.81.03.9Phosphate 8.59.44.33.210.2Platelet,count 9.121.94.65.913.4Potassium 4.85.62.41.85.8Prealbumin 10.919.15.55.514.5Protein,total 2.74.01.41.23.4Prostatic specific antigen14.072.47.018.430.0Analyte CVw CVg I(%)B(%)TE(%)Red cell distribution wide 3.55.71.81.74.6Reticulocyte,count 11.029.05.57.816.8Sodium 0.71.00.40.30.9Sodium Bicarbonate 4.84.72.41.75.6Tissue polypeptide antigen 28.740.414.412.436.1Thyroid stimulating hormone 19.319.79.76.922.8Thyroxine(T4)4.910.92.53.07.0Triglyceride 20.937.210.510.727.9Triiodothyronine(T3)8.717.24.44.812.0Urea 12.318.36.25.515.7CAP认可要求oHas the laboratory verified or established and documented analytic accuracy and precision for each test?o实验室必须验证或建立每个试验的准确度和精密度,并有记录。准确度性能确认方法o对检测系统进行校准和校准验证o能力验证结果,分析前次的PT标本,与回报结果比较o由供应商或制造商提供关于试剂、程序或检验系统溯源性的声明文件。o应用有证参考物质,如CRM470等。o分析病人标本,将结果与参考方法的检测结果 比较。o分析病人标本,将结果与实验室过去确认的方 法检测结果比较。制定校准计划o启用新的检测系统,在分析病人标本前。o在使用过程中,仪器进行较大的维修、维护与保养。o在分析检测过程中,更换试剂批号或更换其他厂家的试剂。o质控失控需要校准时。校准验证o确保现在的校准状态是有效的 o对于一点校准的分析,至少6个月校准验证一次校准验证结果分析o验证1:校准直线的斜率与1无统计差异,截距与0无统计差异,校准验证在可接受范围内,方法和或仪器的校准有效。o验证2:各点校准验正值在可接受的范围内,但校准直线的斜率与1有统计差异,截距与0有统计差异,校准验证在可接受范围内,方法和/或仪器的校准有效。校准验证结果分析差异1:校准直线的斜率与1无统计差异,截距与0无统计差异,有超过了可接受范围的校准验证测定值,方法和或仪器的校准无效。该现象通常由随机误差造成。差异2:校准直线的斜率与1有统计差异,截距与0有统计差异。有超过了可接受范围的校准验证测定值,方法和或仪器的校正无效。该现象由系统误差造成。Linear 1Verified 1Linear 2Verified 1Linear 1Different 2pHiCapO2Linear 1Verified 2Hcy精密度试验基本要求o做重复性试验的样品一定要稳定;它的基质组成应尽可能相似于实际检测的病人标本;样品中的分析物含量应在该项目的医学决定水平处;尽可能地做2个以上水平的精密度实验。o如果对公司的检测系统作实验证实或核实,则选取的样品分析物含量尽量与公司对检测系统性能评估时采用的含量一致,便于比较。精密度试验基本要求o采用冰冻保存的样品一定要注意内含分析物的稳定,要严格控制冻融、混匀的操作。o实验时按厂商操作规程要求做好校准,并且一定要和实验样品一起做质量控制。o收集实验数据,计算均值、标准差和变异系数。o千万不可用一个项目组成的检测系统被评价资料认可分析系统所有项目检测系统的性能。常用的精密度实验方法o批内是将评价样品随机插入病人标本被检测,但一批内连做20次;o天间是每天做一次评价样品,累积20次结果。o常规有控制品进行日常的质量控制检测,绘制控制图,控制检测质量。o天间精密度评价的20次结果,对应每天质量控制都在控。NCCLS EP-5文件精密度实验方法o对稳定的实验样品每天做二批实验,批间相隔的时间不少于2小时,每批对样品做双份测定,共做20天实验。o一共有80个结果,40对。每对结果间的差是每批的批内差。在20天共有40批,这些差值客观地反映了较长时间周期内的批内不精密度。ALT测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P137.737.839.639.639.639.038.937.839P239.239.439.740.840.039.438.9P1132.9133.4138.2136.5135.6134.1135.1135135P2134.7134.7136.6139.3137.7135.5136.4模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.923.192.503.792.532.826.673.3312.2P22.552.543.752.943.252.28P11.731.061.601.683.391.86P21.930.970.931.403.411.70AST测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P137.938.838.938.939.237.838.5837.439P238.939.539.840.239.437.939.28P1141.8143.7142.6143.4147.3142.9143.6144144P2143.7145.3144.6150.7146.4141.6145.4模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.112.323.174.114.084.506.673.336.0P23.082.532.772.992.792.64P11.971.671.142.513.802.73P21.391.520.801.593.481.41TP测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P167.7368.4468.1668.1467.7767.6667.9866.468.0P268.1067.9968.0667.6568.0169.7268.26P150.2050.7950.3850.3950.5150.1450.4049.550.0P250.5050.3350.1150.0850.6251.8450.58模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.671.211.102.391.202.683.331.671.4P21.000.952.611.401.241.56P11.991.221.602.061.902.35P21.350.892.671.041.541.52ALB测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P148.7348.2748.1048.6647.6847.0148.0847.048.0P248.4947.8848.3948.4547.5747.9847.98P131.9231.9031.7632.2831.7331.3031.8230.932.0P231.8231.7132.1032.2031.7532.2631.97模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.371.451.141.641.821.193.331.671.6P21.511.351.612.441.301.46P11.881.511.121.272.331.73P21.441.701.172.021.511.89ALP测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P182.681.383.481.879.178.281.084.482P283.582.083.482.279.980.782.0P1204.5200.8208.3203.1199.1196.3202.0206203P2205.4201.8206.6204.5199.2200.5203.0模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.942.332.043.915.064.0910.05.03.2P22.162.571.813.773.754.09P12.002.482.214.145.173.52P22.142.851.402.693.664.39GGT测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P140.440.840.540.540.140.340.440.340.3P240.840.840.940.340.341.040.7P1187.8190.4187.9184.9185.0187.9187.3192187P2186.2187.4187.5186.3186.0189.6187.2模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.482.701.502.473.492.7310.05.06.9P21.961.951.501.501.742.20P12.132.471.131.132.692.85P21.882.301.121.122.692.85T-BIL测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P121.6120.9321.6620.6120.6420.3920.9720.221.0P221.2920.9421.8620.9720.9620.7321.13P194.3594.9095.0390.3391.2392.4293.0492.792.7P293.5194.6396.0291.3291.8994.2693.60模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.963.523.652.912.523.926.673.3312.8P22.492.481.803.962.862.12P14.092.304.623.223.522.61P24.341.962.603.613.911.98D-BIL测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P113.1713.1712.8912.9713.2112.7213.0213.313.3P213.1813.4813.0413.2413.3112.8013.17P140.5141.4339.7539.8340.8940.3440.4540.440.4P240.3342.3439.9640.4240.7640.0740.64模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.811.932.715.472.353.466.673.3318.4P23.641.921.504.082.402.97P13.383.372.293.593.842.40P23.171.421.812.383.752.75GLU测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P15.315.295.315.305.225.225.275.105.25P25.305.285.315.255.165.185.25P113.2913.3813.3213.3113.1813.1313.2713.013.2P213.2513.3213.3213.2012.9513.0413.18模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.342.111.331.751.571.823.331.672.9P21.431.481.391.601.361.62P11.611.450.801.012.281.80P20.971.771.082.081.621.31UA测定日间不精密度评价 模块4月5月6月7月8月9月累积靶值调整P1265.3257.0269.0273.4274.8269.9268.2263268P2271.4267.2266.5268.1267.8261.3267.1P1642.9616.6648.1654.5661.2648.0645.2637644P2655.8646.4642.6645.0647.3628.0644.2模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.301.611.371.720.982.335.672.834.30P21.581.461.931.340.822.91P12.712.261.080.901.742.56P21.771.811.820.741.883.28Urea测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P16.926.816.836.906.826.756.846.786.78P27.047.016.916.986.706.756.90P125.7425.8426.0026.1625.8725.4225.8425.5025.50P226.2626.1525.7726.2025.2925.5125.86模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.382.122.071.872.683.353.01.56.2P23.032.541.682.251.453.00P11.681.651.921.133.102.81P21.211.601.801.371.742.61Crea测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P1101.5102.7102.0102.699.6101.1101.6101.0101.0P2103.2102.4102.9101.699.4101.8101.9P1346.7350.0348.1343.6342.9344.8346.0354.0346.1P2349.6348.0347.0345.0340.7346.8346.2模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P15.223.203.483.413.214.065.02.52.2P23.593.822.453.153.324.22P14.042.371.982.743.094.06P21.972.142.602.383.143.17CO2测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P115.9315.6516.5217.2417.4516.4017.916.5P215.9315.7216.1716.9517.8616.52P127.0626.6726.6826.6827.5026.9126.926.9P227.6326.4426.4826.9327.5026.99模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P16.847.196.235.574.586.3610.05.0P27.456.115.697.425.075.71P15.184.223.504.126.075.27P26.344.093.415.297.465.20TCH测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P12.522.552.532.442.522.482.512.462.51P22.632.522.512.452.492.512.52P14.714.744.674.534.714.624.664.714.68P24.894.714.664.534.704.684.69模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.383.013.611.762.142.533.331.673.0P21.401.941.871.951.931.99P11.551.462.841.991.971.38P21.291.551.022.052.151.30TG测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P11.291.321.351.321.311.291.311.321.32P21.341.351.361.341.301.301.33P12.142.192.232.182.182.132.172.172.17P22.212.222.232.222.162.152.20模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.242.492.913.401.912.018.334.1610.5P21.642.952.042.681.001.53P12.152.702.062.832.381.87P21.221.850.880.952.081.48CK测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P1175.8176.1176.8172.4173.7182.1176.2170175P2176.3175.7177.8173.3171.4175.8175.0P1471.5472.5472.8460.0465.1486.6471.4460467P2470.9470.4473.2456.8454.7465.2465.2模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.591.471.952.322.531.8710.05.011.4P21.641.651.051.151.871.19P11.421.800.701.783.501.89P21.701.902.411.363.212.00LDH测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P1157.4161.4158.2159.3158.0159.8159.0156156P2156.5154.4155.8154.2154.7156.0155.2P1257.7263.8258.2260.1260.7261.0260.3256256P2255.9253.4253.8249.2254.0256.0253.7模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.521.852.362.761.962.326.673.334.3P21.661.621.042.201.551.73P11.591.481.121.653.112.57P22.341.701.721.812.831.96HBDH测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P1144.8144.8145.1145.0149.7147.7146.2143145P2143.4145.2143.1142.8146.0144.6144.2P1251.7248.3246.7247.7257.1254.2251.0249249P2246.2249.7244.2243.9249.1247.8246.8模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P11.801.732.182.972.271.966.673.334.4P22.091.791.932.522.951.94P12.031.651.482.142.491.69P21.871.721.302.543.411.53HDL-C、LDL-C测定日间不精密度评价项目模块5月6月7月8月9月累积靶值调整HDLP11.421.431.411.401.421.351.43P21.421.431.441.461.44LDLP12.852.812.842.892.852.722.86P22.822.872.892.932.88项目模块5月6月7月8月9月1/3CLIA1/6CLIA生物变异HDLP11.481.051.561.3610.05.03.6P21.260.981.731.23LDLP12.492.061.552.2810.05.04.2P21.963.471.482.38载脂蛋白测定日间不精密度评价项目模块5月6月7月8月9月累积靶值调整APOA1P11.671.571.561.601.601.761.60P21.661.581.571.611.60APOBP10.860.860.850.850.850.830.85P20.840.850.850.850.85项目模块5月6月7月8月9月1/3CLIA1/6CLIA生物变异APOA1P15.094.644.162.8710.05.03.3P23.392.902.742.79APOBP12.353.343.294.9410.05.03.5P22.523.492.463.84CK-MB测定日间不精密度评价模块4月5月6月7月8月9月累积靶值调整P145.1245.5745.3843.6643.9342.5344.5342.244.3P244.8846.1645.4342.9642.4643.8144.28模块4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P12.353.876.375.544.393.8410.05.09.9P23.653.665.163.473.463.47特殊蛋白测定日间不精密度评价项目4月5月6月7月8月9月累积靶值调整IGA2.181.172.232.202.152.15IGG10.2910.2910.5010.3610.1010.10IGM0.850.841.850.850.840.84C31.2451.2301.2401.2381.201.20C40.1860.1810.1870.1850.1950.195项目4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异IGA1.941.841.482.238.334.162.7IGG1.882.311.151.958.334.162.3IGM2.951.780.812.028.334.163.0C33.051.710.828.334.162.6C44.192.211.738.334.164.5NA、K测定日间不精密度评价项目4月5月6月7月8月9月累积靶值调整NA126.3123.2123.2124.6124.0125.3124.4123124152.0149.3149.9149.8150.9151.2150.5149150K3.573.453.423.543.593.583.523.323.526.146.056.076.106.156.196.116.026.11项目4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异NA1.351.221.471.691.451.281.50.750.40.861.201.201.401.490.99K1.461.241.923.442.531.763.31.652.41.371.342.021.971.931.70Cl、Ca测定日间不精密度评价项目4月5月6月7月8月9月累积靶值调整CL86.2484.1083.5484.8584.8185.3284.8082.684.80118.7116.3116.4116.6117.0117.5117.1117117.1CA2.302.312.272.302.272.262.282.282.283.313.323.283.283.293.253.293.313.29项目4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异CL1.291.281.421.811.471.471.70.850.61.021.421.501.391.611.38CA2.702.642.793.003.003.543.331.651.02.782.562.732.953.233.29Mg、P测定日间不精密度评价项目4月5月6月7月8月9月累积靶值调整P1.191.181.181.211.161.161.181.181.181.971.941.941.971.951.921.951.931.95MG1.041.041.041.041.061.031.041.031.041.661.611.561.591.631.611.611.681.61项目4月5月6月7月8月9月1/3CLIA1/6CLIA生物变异P2.221.611.501.581.731.556.663.334.31.501.341.120.812.311.30MG1.442.211.355.871.422.138.334.161.81.201.681.516.243.743.42可报告范围核实实验oThe ANALYTICAL MEASUREMENT RANGE(AMR)is the range of analyte values that a method can directly measure on the specimen without any dilution,concentration,or other pretreatment not part of the usual assay processo分析测量范围(AMR)分析方法能直接测定样本中的待测物质而不需稀释或浓缩或其它的预处理可报告范围核实实验oThe CLINICALLY REPORTABLE RANGE(CRR)is the range of analyte values that a method can measure,allowing for specimen dilution,concentration,or other pretreatment used to extend the direct analytical measurement rangeo临临床床可可报报告告范范围围(CRRCRR)样本可通过稀释或浓缩或其它的预处理,以扩展其准确测定的范围,可结合临床要求。病人标本可报告范围核实实验o病人结果可报告范围是检验方法的重要分析性能。病人标本未经任何处理,由检验方法得到可靠的结果范围为病人结果可报告范围。o将样品作不同浓度稀释或配制后,将预期值与实测值作比较,绘制在座标纸上应呈一条通过原点、斜率为1的直线。直线所达到的限值即为该方法的病人结果可报告范围。病人标本可报告范围核实实验o收集高值(H)病人血清标本(超过试剂说明书的线性范围上限)和低值(L)病人血清标本(超过试剂说明书的线性范围下限),适当比例混合(100L、80L+20H、60L+40H、40L+60H、20L+80H、10L+90H、100H),形成系列血清。o在相应的检测系统上对系列血清进行检测,重复4次,记录结果。病人标本可报告范围核实实验o以4次重复测定的均值表示H和L两个样品测定结果,依比例稀释关系计算出各个样品的预期值,每个样品重复测定4次,得4个实测值,与预期值形成4对预期值和实测值;o在坐标纸上,以x表示预期值,y表示实测值,将所有实验结果点在图上;o计算回归方程:Y=bX+a,若b在0.97-1.03之间,a接近于0,则直接判断可报告范围在实验已涉及浓度。GGT可报告范围核实实验预期值和实测值x403607813934105511521213Y1402609802925105411541200Y2404611805929106511581201Y3404610809926106211611202Y4406614810934105611631199Y404611807928105911591201分析灵敏度(最低检测限)o方法一:分析生理盐水、蒸馏水或“0”浓度质控品至少10次;计算均值、标准差;2倍标准差即是分析灵敏度或最低检测限。o方法二:分析至少4个浓度水平的校准品或能力验证标本或线性标准和空白,将结果作图,分析灵敏度是线性的最低点。如果该直线通过“0”,灵敏度即为“0”;如果灵敏度不是“0”,由最低临界值确定该灵敏度水平。分析干扰(特异性)以下一种或多种方案可确定方法特异性:o参考试剂盒或文献报道给出的特异性指标。o本实验室的PT结果与同行间的一致性以反映方法的特异性。o可用常见的干扰物质(如血红蛋白、胆红素、脂肪等)进行干扰试验以确定方法的特异性。携带污染o准备4个样本杯,分别盛放3个相同低浓度的病人标本(分别标为L1,L2,L3)和1个高浓度病人标本标本(H)。o按L1,L2,H,L3顺序在样本架上放置标本,进行分析。o携带污染率的计算如下:Percent Carryover=(L3 L2)/H X 100%o该方案研究的是样本针的携带污染情况携带污染o准备8个样本杯,分别盛放4个相同低浓度的病人标本标本(L1,L2,L3,L4)和4个高浓度病人标本标本(H)。o按H1,H2,H3,H4,L1,L2,L3,L4顺序 在样本架上放置标本,进行分析。o携带污染率:Percent Carryover=L1(L3+L4)/2/(H3+H4)/2-(L3+L4)/2 X 100%建立或验证参考范围oHas the laboratory established or verified its r