Preparation and evaluation of standards for whole blood trace elements detection / 中华检验医学杂志

Objective To explore the methods of preparing whole blood control of seven trace elements (magnesium,manganese,iron,copper,zinc,lead,calcium) in laboratory and evaluate its performance.Methods Heparin sodium anticoagulant calf whole blood was used as substrateMetal salt or standard solution with target concentration of each element was added.And whole blood control product was made after process of anticorrosion,mixing and sub-packaging.Antibacterial effect was observed,uniformity and stabilitywasevaluatedaccording to CNAS-GL03 and matrix effects was evaluatedaccording to CLSI EP14.SDI (standard deviation index) and detection coefficient of variation (CV)were calculated to evaluateapplication effectiveness.Results Laboratory preparation of whole blood control reached target concentration,sterility tests was qualified,results of uniformity and stability indicated that the substrate was even and stable at least for one year.Besides,matrix effects of other six elements can be ignored except lead.Historical and inter-laboratory comparisons had shown that laboratory preparation of whole blood control has no obvious difference with commercial ones in performance.Conclusion The formulation and evaluation scheme of whole blood control of seven trace elements (magnesium,manganese,iron,copper,zinc,lead,calcium) was feasible and can be used as commercial ones for elementary tests in medical laboratory.

Designing and implementation of a web-based quality monitoring system for plasma glucose measurement in multicenter population study / 中华流行病学杂志

Objective The aim of this paper is to describe the designing and implementation of a web-based plasma glucose measurement quality monitoring system to assess the analytical quality of plasma glucose measurements in multicenter population study and provide evidence for the future studies.Methods In the chronic non-communicable disease and related factor surveillance in China,a web based quality monitoring system for plasma glucose measurement was established to conduct evaluation on plasma glucose monitoring quality and effectiveness in 302 surveillance centers,including quality control data entry,transmission and feedback.Results The majority of the surveillance centers met the quality requirements and passed the evaluation of reproducibility and precision of plasma glucose measurement,only a few centers required intensive training and re-assessment.Conclusion In order to ensure the completeness and reliability of plasma glucose measurement in the surveillance centers,the establishment of web-based plasma glucose measurement quality control system can facilitate the identification of the qualified surveillance centers and evaluation of plasma glucose measurement quality in different regions.Communication and training are important in ensuring plasma glucose measurement quality.It is necessary to further improve this web-based plasma glucose measurement quality monitoring system in the future to reduce the method specific plasma glucose measurement bias.