Measurements of inorganic elements in clinical laboratories produce results used for the diagnosis, the treatment and the monitoring of deficiencies or overloads. The main objective of External Quality Assessment Schemes is to verify, on a regular frequency, that clinical laboratory results correspond to the quality requirement for patient care. Therefore, External Quality Assessment Schemes represent an essential component of a laboratory's quality management system. However, External Quality Assessment Schemes within the same analytical field remain heterogeneous for different reasons such as samples, determination of assigned value, acceptable limits, content of the reports. The aim of this review was to describe and illustrate some major critical aspects of External Quality Assessment Schemes based on Occupational and Environmental Laboratory Medicine external quality assessment scheme experience.

中文翻译：

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临床实验室中无机元素的外部质量评估计划：OELM计划的经验教训。

在临床实验室中对无机元素的测量可得出用于诊断，治疗和监测缺陷或超负荷的结果。外部质量评估计划的主要目标是定期验证临床实验室结果是否符合患者护理的质量要求。因此，外部质量评估计划是实验室质量管理体系的重要组成部分。但是，由于不同的原因，例如样品，确定赋值，可接受的限度，报告的内容，同一分析领域内的外部质量评估计划仍然是异类的。