De Plaen P, Claeys-Thoreau F, De Boeck R
Epidemiology Unit, Institute of Hygiene and Epidemiology, Brussels, Belgium.
Ann Ist Super Sanita. 1996;32(2):215-20.
An external quality assessment scheme for heavy metal analyses has been implemented in Belgium (quality control in Belgium, QCB) by the Epidemiology Unit of the Institute of Hygiene and Epidemiology since 1993. Aims of the scheme are to improve laboratories performances by means of interlaboratory comparisons and to provide national authority with information about the dispersion of results for heavy metal analyses in Belgium. The analytes included in the QCB are lead, cadmium and selenium in blood. Control samples are in-house prepared from human blood, spiked with appropriate amounts of Pb, Cd and Se. Four exercises are performed every year and participants receive three samples to analyze. Target values are calculated for each element from the regression lines obtained by plotting the results of a reference laboratory against the added amounts. The QCB does not yet include acceptability criteria of the results and no measures are taken against poor performers at this stage, although advice is available by personal contacts with the organisers.
自1993年以来，比利时卫生与流行病学研究所的流行病学部门实施了一项重金属分析外部质量评估计划（比利时质量控制，QCB）。该计划的目的是通过实验室间比对来提高实验室性能，并向国家当局提供有关比利时重金属分析结果离散度的信息。QCB中包含的分析物是血液中的铅、镉和硒。对照样品由人血内部制备，并添加适量的铅、镉和硒。每年进行四次测试，参与者会收到三个样品进行分析。通过将参考实验室的结果与添加量绘制在一起得到的回归线，为每个元素计算目标值。QCB尚未包括结果的可接受标准，现阶段也没有对表现不佳者采取任何措施，不过可以通过与组织者个人联系获得建议。
