Analysis on external quality control network results for iodine deficiency disorders laboratories in Jiangxi Province in 2018 / 中华地方病学杂志

ABSTRACT

Objective:To analyze the results of external quality control network of iodine deficiency disorders (IDD) laboratories in Jiangxi Province in 2018, to summarize the total detection level and capability at all levels, and to provide reliable quality assurance for monitoring and prevention of IDD.Methods:In 2018, IDD laboratories of provincial, municipal and county-level in Jiangxi Province were examined for the external quality control of salt iodine, urinary iodine and water iodine. Among them, there were 1 provincial, 11 municipal and 30 county-level laboratories participated in salt iodine assessment; there were 1 provincial, 11 municipal and 100 county-level laboratories participated in urinary iodine assessment; and there were 1 provincial and 11 municipal laboratories participated in water iodine assessment. Salt iodine was determined by direct titration method (GB/T 13025.7-2012); urinary iodine was determined by As 3+-Ce 4+ catalytic spectrophotometry method (WS/T 107.1-2016) or inductively coupled plasma mass spectrometry method (WS/T 107.2-2016); water iodine was determined by the method in the range of 0 - 100 μg/L in "Study on the Method Suitable for the Detection of Water Iodine in Areas with Iodine Deficiency and High Iodine" recommended by national IDD reference laboratory. Urinary iodine was determined with Z score method, when│Z│≤ 2, it was qualified; when 2 <│Z│ < 3, it was basically qualified; when│Z│≥ 3, it was not qualified. Water iodine and salt iodine were determined by the method of reference value ± uncertainty, and the average value of the test results within this range was judged to be qualified; otherwise, it was judged to be unqualified. Results:In 2018, the feedback rates and qualified rates of salt iodine, urinary iodine and water iodine in 1 provincial and 11 municipal laboratories in Jiangxi Province were all 100.00%. Thirty county-level laboratories participated in the salt iodine assessment, and 1 of them failed. One hundred county-level laboratories participated in the urinary iodine assessment, and 3 of them failed.Conclusion:Laboratory testing technology of IDD continues to maintain at a high level in Jiangxi Province in 2018, and the detection ability of some county-level laboratories needs to be further improved.