Quality analysis of urinary fluoride detection ability from 2010 to 2012 in Guizhou endemic fluorosis monitoring network laboratories / 中华地方病学杂志

ABSTRACT

Objective To evaluate the urinary fluorine detection quality of endemic fluorosis monitoring network laboratories in Guizhou Province and promote the improvement of quality control.Methods From 2010 to 2012,according to the method for determination of fluoride in urine by ion selective electrode,in 11 endemic fluorosis monitoring network laboratories in Guizhou,an quality control assessment was done.In the internal quality control assessment,standard substance detection inspection was used for personnel parallel samples and equipment comparison,t test was used to compare the inter-group differences.In the external quality control inspection,blind urine fluorine sample was tested,and a Z score value evaluation method was used to compare the relative error of the test results.Results In the assessment of internal quality control,the parallel comparison test results of sample,personnel and instrument showed that the differences were not statistically significant (t =-1.81-1.80,P ＞ 0.05).In 2010,in the external quality control inspection,there was 1 laboratory |Z|≥3,and 2 test results |Z| ＞2;in 2011,there was 4 test results |Z| ＞ 2;in 2012,there was 5 test results |Z| ＞ 2;in 2010,there was one laboratory in a blind test,relative error of the results ＞ 20％;in 2011 and 2012,there was a laboratory in a blind test,relative error of the results ＞ 10％.Conclusion The endemic fluorosis monitoring network laboratory testing ability in Guizhou is relatively good,but there is an obvious individual laboratory system error.