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IVD准确度/正确度-计算模板

IVD准确度/正确度-计算模板

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正确度

是大批检测结果的均值与真值的一致程度。正确度与系统误差有关,与随机误差无关,正确度通常以偏倚表示。

准确度

是检测结果与被检测真值之间的一致程度,其与测量正确度和精密度有关。同正确度一样,准确度为一种定性的概念。

如需获取完整详细资料,可长按识别小程序

对于定性检测体外诊断试剂,常用准确度进行描述。

1.定性检测体外诊断试剂准确度

可选择下述两种方式或两种方式之一进行准确度研究。

1.1方法学比对

采用申报试剂与诊断准确度标准或已上市产品,同时检测临床样本,比较检测结果之间的一致性程度,进行申报试剂的准确度评价。

样本应选择符合样本稳定性的预期人群样本,或参考样本盘。研究应纳入一定数量的阴性和阳性样本,并注意包含一定数量的阳性判断值附近的样本和干扰样本。

值得注意的是,上述样本的要求是易发补项,尤其注意应包含一定数量的临界阳性和干扰样本。

IVD精密度注册资料模板

1.2参考品(盘)的检测

通过检测参考品(盘)分析申报产品检测结果与经确认结果的符合情况,评价申报产品的准确度。此处所述参考品(盘)指已经诊断准确度标准/其他成熟方法检测确认过的,或有准确临床诊断信息的,由多份样本组成的一套样本。

应注意参考品(盘)对各种常见型别/流行株的覆盖和对所有检测位点的覆盖,包含不同来源、不同浓度水平的临床样本/临床混合样本和/或菌株/毒株。建议参考品(盘)还应包含不含待测靶物质的干扰及交叉样本等。对于临床罕见样本可采用细胞系或人工制备的样本作为参考品(盘)的组成,但应注意样本基质与临床样本的一致性,提交人工制备的样本与临床真实样本的一致性研究分析。

目前,可商业化购买的参考品(盘)较少,更多产品准确度评价以方法学比对为主。

2.定量检测体外诊断试剂正确度

正确度由系统测量误差决定,通常用偏倚(bias)表示。根据检测试剂的实际情况,参考物质、比较测量程序等的可获得性,可选择下述方法进行正确度评价。应提供正确度评价用物质或比较测量程序的基本信息和选择依据。

2.1使用参考物质的正确度评价

参考物质的值可作为参考量值,用于评估试剂检测结果的偏倚。推荐的参考物质包括:具有互换性的有证参考物质,公认的参考品、标准品,参考测量程序赋值的临床样本。不可采用产品校准品、申报试剂检测系统定值的质控品进行正确度评价。

建议采用2~3个水平的参考物质,代表试剂测量区间内的不同浓度,其中应包括医学决定水平或参考区间上/下限附近的浓度。进行多次重复检测,采用检测结果平均值与参考量值计算偏倚。如参考物质只有1个水平,且无合理稀释方法,亦可在说明原因的基础上,仅采用1个水平的参考物质进行正确度评价。

2.2方法学比对

采用申报试剂与合理的比较测量程序同时检测临床样本,通过两者的比对研究和偏倚估计,进行申报试剂的正确度评价。比较测量程序可选择同类试剂或者参考测量程序。临床样本的浓度水平应覆盖申报试剂的测量区间。在性能建立时,建议对每个样本重复检测,以平均值或中位数进行回归分析,并评价医学决定水平或参考区间上/下限浓度的偏倚。

2.3回收试验

对于可获得标准溶液、标准物质或分析物纯品的试剂(例如部分临床化学检测试剂),可采用回收试验进行正确度评价。将标准溶液、标准物质或分析物纯品加入临床样本中,配制成回收样品,进行检测。标准溶液、标准物质的体积与临床样本的体积比应不会产生基质的变化,一般加入体积不超过总体积的10%。

检测至少3个水平的回收样品,代表试剂测量区间内的高、中、低浓度,其中应包括医学决定水平或参考区间上/下限附近的浓度。每个浓度应进行多次重复检测,采用检测结果平均值计算回收率。

参考资料

定性检测体外诊断试剂分析性能评估注册审查指导原则

定量检测体外诊断试剂分析性能评估注册审查指导原则

YY/T 17892-2021 体外诊断检验系统 性能评价方法 第2部分:正确度

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IVD精密度注册资料模板

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  1. CONNECT:[ UseTime:0.000578s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000778s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000254s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000554s ]
  8. SELECT * FROM `article` WHERE `id` = 574545 LIMIT 1 [ RunTime:0.000476s ]
  9. UPDATE `article` SET `lasttime` = 1777784534 WHERE `id` = 574545 [ RunTime:0.012471s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000288s ]
  11. SELECT * FROM `article` WHERE `id` < 574545 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000625s ]
  12. SELECT * FROM `article` WHERE `id` > 574545 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 574545 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004135s ]
  14. SELECT * FROM `article` WHERE `id` < 574545 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001669s ]
  15. SELECT * FROM `article` WHERE `id` < 574545 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000571s ]
0.127863s