AIM To study sigma metrics and quality goal index ratio(QGI). METHODS The retrospective study was conducted at the Clinical Biochemistry Laboratory, PGIMS, Rohtak, which recently became a National Accreditation Board ...AIM To study sigma metrics and quality goal index ratio(QGI). METHODS The retrospective study was conducted at the Clinical Biochemistry Laboratory, PGIMS, Rohtak, which recently became a National Accreditation Board for Testing and Calibration of Laboratories accredited lab as per the International Organization for Standardization 15189:2012 and provides service to a > 1700-bed tertiary care hospital. Data of 16 analytes was extracted over a period of one year from January 2017 to December 2017 for calculation of precision, accuracy, sigma metrics, total error, and QGI. RESULTS The average coefficient of variation ranged from 2.12%(albumin) to 5.42%(creatinine) for level 2 internal quality control and 2%(albumin) to 3.62%(high density lipoprotein-cholesterol) for level 3 internal quality control. Average coefficient of variation of all the parameters was below 5%, reflecting very good precision. The sigma metrics for level 2 indicated that 11(68.5%) of the 16 parameters fall short of meeting Six Sigma quality performance. Of these, five failed to meet minimum sigma quality performance with metrics less than 3, and another six just met minimal acceptable performance with sigma metrics between 3 and 6. For level 3, the data collected indicated eight(50%) of the parameters did not achieve Six Sigma quality performance, out of which three had metrics less than 3, and five had metrics between 3 and 6. QGI ratio indicated that the main problem was inaccuracy in the case of total cholesterol, aspartate transaminase, and alanine transaminase(QGI > 1.2), imprecision in the case of urea(QGI < 0.8), and both imprecision and inaccuracy for glucose.CONCLUSION On the basis of sigma metrics and QGI, it may be concluded that the Clinical Biochemistry Laboratory, PGIMS, Rohtak was able to achieve satisfactory results with world class performance for many analytes one year preceding the accreditation by the National Accreditation Board for Testing and Calibration of Laboratories. Aspartate transaminase and alanine transaminase required strict external quality assurance scheme monitoring and modification in quality control procedure as their QGI ratio showed inaccuracy.展开更多
目的运用分析批长度Westgard西格玛规则流程图优化实验室肿瘤标志物检测项目质控策略以及质量目标指数查找质量下降的原因,降低实验室成本和风险,提升实验室检测水平。方法收集本院核医学科2020年5月和6月两个月的肿瘤标志物检测项目室...目的运用分析批长度Westgard西格玛规则流程图优化实验室肿瘤标志物检测项目质控策略以及质量目标指数查找质量下降的原因,降低实验室成本和风险,提升实验室检测水平。方法收集本院核医学科2020年5月和6月两个月的肿瘤标志物检测项目室内质控在控数据的变异系数(coefficient of variation,CV)及2020年6月卫生部室间质评实验数据中的偏倚(Bias)值,采用2020年卫生部临床检验中心性能规范中的总允许误差(TEa),计算各项目的西格玛(σ)值,然后运用分析批长度Westgard西格玛规则图选择合适的质控规则,最后计算质量目标指数(quality goal index,QGI),分析影响质量性能的主要因素,通过3个月的改进,利用2020年9月和10月在控数据的CV值及2020年9月卫生部第二次的Bias值重新计算西格玛(σ)值,最后通过配对t检验验证差异有无统计学意义。结果σ值>6的项目有FPSA,应选择单规则13S,分析批长度R1=1000个;σ值介于5和6之间的项目有NSE,应选用多规则13s/22s/R4s,分析批长度R1=450个;σ值介于4和5之间的项目有CA125、CA19-9、TPSA,应选择多规则13s/22s/R4s/41s,分析批长度R1=200个;σ值小于4的项目有AFP、CEA、CA15-3、CA72-4、CYFRA21-1,应采用多规则13s/22s/R4s/41s/6x,分析批长度R1=45个。QGI小于0.8的项目有AFP、CEA、CA125、CA15-3、CA19-9、CA72-4、NSE、CYFRA21-1共计8个项目,优先改进精密度,大于1.2的项目只有TPSA,优先改进正确度。结论分析批长度Westgard西格玛规则图和质量目标指数两者相结合,可以为质控策略提供依据,使肿瘤标志物检测质量得到改进。展开更多
文摘AIM To study sigma metrics and quality goal index ratio(QGI). METHODS The retrospective study was conducted at the Clinical Biochemistry Laboratory, PGIMS, Rohtak, which recently became a National Accreditation Board for Testing and Calibration of Laboratories accredited lab as per the International Organization for Standardization 15189:2012 and provides service to a > 1700-bed tertiary care hospital. Data of 16 analytes was extracted over a period of one year from January 2017 to December 2017 for calculation of precision, accuracy, sigma metrics, total error, and QGI. RESULTS The average coefficient of variation ranged from 2.12%(albumin) to 5.42%(creatinine) for level 2 internal quality control and 2%(albumin) to 3.62%(high density lipoprotein-cholesterol) for level 3 internal quality control. Average coefficient of variation of all the parameters was below 5%, reflecting very good precision. The sigma metrics for level 2 indicated that 11(68.5%) of the 16 parameters fall short of meeting Six Sigma quality performance. Of these, five failed to meet minimum sigma quality performance with metrics less than 3, and another six just met minimal acceptable performance with sigma metrics between 3 and 6. For level 3, the data collected indicated eight(50%) of the parameters did not achieve Six Sigma quality performance, out of which three had metrics less than 3, and five had metrics between 3 and 6. QGI ratio indicated that the main problem was inaccuracy in the case of total cholesterol, aspartate transaminase, and alanine transaminase(QGI > 1.2), imprecision in the case of urea(QGI < 0.8), and both imprecision and inaccuracy for glucose.CONCLUSION On the basis of sigma metrics and QGI, it may be concluded that the Clinical Biochemistry Laboratory, PGIMS, Rohtak was able to achieve satisfactory results with world class performance for many analytes one year preceding the accreditation by the National Accreditation Board for Testing and Calibration of Laboratories. Aspartate transaminase and alanine transaminase required strict external quality assurance scheme monitoring and modification in quality control procedure as their QGI ratio showed inaccuracy.
文摘目的运用分析批长度Westgard西格玛规则流程图优化实验室肿瘤标志物检测项目质控策略以及质量目标指数查找质量下降的原因,降低实验室成本和风险,提升实验室检测水平。方法收集本院核医学科2020年5月和6月两个月的肿瘤标志物检测项目室内质控在控数据的变异系数(coefficient of variation,CV)及2020年6月卫生部室间质评实验数据中的偏倚(Bias)值,采用2020年卫生部临床检验中心性能规范中的总允许误差(TEa),计算各项目的西格玛(σ)值,然后运用分析批长度Westgard西格玛规则图选择合适的质控规则,最后计算质量目标指数(quality goal index,QGI),分析影响质量性能的主要因素,通过3个月的改进,利用2020年9月和10月在控数据的CV值及2020年9月卫生部第二次的Bias值重新计算西格玛(σ)值,最后通过配对t检验验证差异有无统计学意义。结果σ值>6的项目有FPSA,应选择单规则13S,分析批长度R1=1000个;σ值介于5和6之间的项目有NSE,应选用多规则13s/22s/R4s,分析批长度R1=450个;σ值介于4和5之间的项目有CA125、CA19-9、TPSA,应选择多规则13s/22s/R4s/41s,分析批长度R1=200个;σ值小于4的项目有AFP、CEA、CA15-3、CA72-4、CYFRA21-1,应采用多规则13s/22s/R4s/41s/6x,分析批长度R1=45个。QGI小于0.8的项目有AFP、CEA、CA125、CA15-3、CA19-9、CA72-4、NSE、CYFRA21-1共计8个项目,优先改进精密度,大于1.2的项目只有TPSA,优先改进正确度。结论分析批长度Westgard西格玛规则图和质量目标指数两者相结合,可以为质控策略提供依据,使肿瘤标志物检测质量得到改进。
