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目的:分析2018年内蒙古自治区（简称内蒙古）各级碘缺乏病（IDD）实验室外质控考核结果，了解各级实验室检测能力。方法:2018年对内蒙古自治区级实验室及全部12个盟市级实验室进行了盐碘、尿碘、水碘考核（74个旗县区级实验室参加尿碘考核，100个旗县区级实验室参加盐碘考核）。盐碘测定采用直接滴定法（GB/T 13025.7-2012）；尿碘测定采用砷铈催化分光光度测定方法（WS/T 107.1-2016）；水碘采用《适合缺碘及高碘地区水碘检测的方法研究》中0 ~ 100 μg/L范围测定方法，对内蒙古各级IDD实验室外质控考核结果进行统计学分析。结果:2018年自治区级实验室3项考核全部合格，盟市级实验室盐碘、尿碘、水碘合格率分别为83.3%（10/12）、91.7%（11/12）、100.0%（12/12），旗县区级实验室盐碘、尿碘合格率分别为95.0%（95/100）、90.5%（67/74）。结论:内蒙古各级IDD实验室检测能力整体上已趋于稳定，但是若干实验室仍有波动，建议持续做好各级实验室人员的技术和责任感培训、仪器检定、实验环境控制、质量控制。“,”Objective:To analyze the results of external quality assessment (EQA) of different levels laboratories of iodine deficiency disorders (IDD) in Inner Mongolia in 2018, and to understand the detection ability of these laboratories.Methods:In 2018, the Inner Mongolia region level laboratories and all 12 league and municipal level laboratories were assessed for salt iodine, urinary iodine and water iodine (74 banner, county and district level laboratories participated in the urinary iodine assessment, and 100 banner, county and district level laboratories participated in the salt iodine assessment). Asn 3+-Cen 4+ catalytic spectrophotometry (WS/T 107.1-2006) was used to measure the iodine in urine, direct titrimetric method (GB/T 13025.7.1-2012) was used to measure the salt iodine, and water iodine was determined based on “Determination of Iodine in Drinking Water by Asn 3+-Cen 4+ Catalytic Spectrophotometry” in the range of 0 - 100 μg/L. The examination results of EQA of different levels of IDD laboratories in Inner Mongolia were statistically analyzed.n Results:Regional level leboratory passed all the 3 assessments, qualified rates of salt iodine, urinary iodine and water iodine were 83.3% (10/12), 91.7% (11/12), and 100.0% (12/12), respectively, at league and municipal level; qualified rates of salt iodine and urinary iodine were 95.0% (95/100), and 90.5% (67/74), respectively, at banner, county and district level in 2018.Conclusions:The detection ability of IDD laboratories at all levels in the whole region has been stabilized, but there are still fluctuations in some laboratories. It is suggested that the technical and responsibility training, instrument verification, experimental environment control and quality control of laboratories at all levels should be continued.