摘要目的:了解青海省各级实验室氟、砷检测质量及外质控考核情况。方法:利用Z分值法对2021年青海省参加水氟、砖茶氟外质控考核的1个省级、8个市级和43个县级疾病预防控制机构实验室，以及参加水砷、尿砷外质控考核的1个省级、1个市级和2个县级疾病预防控制机构实验室的考核结果进行分析及评价，并计算各考核实验室的外质控反馈率和合格率。结果:2021年青海省省、市级实验室水氟、砖茶氟、水砷、尿砷外质控反馈率均为100.00%；除水氟合格率为7/9外，其他项目外质控合格率均为100.00%。县级实验室水氟、砖茶氟、水砷、尿砷外质控反馈率均为100.00%；除水氟合格率为86.05%（37/43）外，其他项目外质控合格率均为100.00%。实验室具体考核结果中，1个省级、1个市级和2个县级实验室水氟样品FS20210101及1个县级实验室水氟样品FS20210102考核结果为可疑；3个县级实验室水氟样品FS20210101考核结果为不满意；其余实验室的各氟、砷样品考核结果均为满意。结论:青海省各级实验室氟、砷外质控考核合格率较高，但仍存在个别县级实验室水氟考核结果不满意，应有针对性地加强实验室水氟检测水平。

abstractsObjective:To learn about the detection quality and external quality control assessment of fluoride and arsenic in laboratories at all levels in Qinghai Province.Methods:The Z-score method was used to analyze and evaluate the evaluation results of 1 provincial, 8 municipal and 43 county level laboratories of disease prevention and control institutions participating in the external quality control assessment of water fluoride and brick tea fluoride in Qinghai Province in 2021, as well as 1 provincial, 1 municipal and 2 county level laboratories of disease prevention and control institutions participating in the external quality control assessment of water arsenic and urine arsenic. The feedback rate and qualification rate of external quality control of each assessment laboratory were calculated.Results:In 2021, the feedback rate of external quality control of water fluoride, brick tea fluoride, water arsenic and urine arsenic in provincial and municipal level laboratories of Qinghai Province were 100.00%; except that the qualified rate of water fluoride was 7/9, the qualified rate of external quality control of other projects was 100.00%. The feedback rate of external quality control of water fluoride, brick tea fluoride, water arsenic and urine arsenic in county level laboratories was 100.00%; except that the qualified rate of water fluoride was 86.05% (37/43), the qualified rate of external quality control of other projects was 100.00%. In the specific assessment results of the laboratory, the assessment results of water fluoride sample FS20210101 from 1 provincial, 1 municipal and 2 county level laboratories, and FS20210102 from 1 county level laboratory were suspicious; the assessment results of water fluoride sample FS20210101 from 3 county level laboratories were not satisfactory; the assessment results of fluoride and arsenic sample in other laboratories were satisfactory.Conclusions:The qualified rate of external quality control of fluoride and arsenic in laboratories at all levels in Qinghai Province is relatively high, but some county level laboratories are still dissatisfied with the assessment results of water fluoride. Therefore, it is necessary to strengthen the detection level of water fluoride in laboratories.