Abstract:

Objective To analyze the performance of mutual recognition quantitative items in Shanghai，in order to promote the mutual recognition of determination results in medical institutions. Methods The results of 58 mutual recognition quantitative items of clinical laboratories in Shanghai Center for Clinical Laboratory（SCCL） from the second External Quality Assessment（EQA） in 2020 were selected to calculate the EQA scores and the sigma（σ） metrics from allowable total error（TEa） sources. Results A total of 802 clinical laboratories of medical institutions reported the results of 58 mutual recognition quantitative items. EQA pass rates ranged from 92.59%（antithrombin） to 100.00%（18 items）. The failed rates of medical institutions were 32.54% in public hospitals and 67.46% in non-medical institution clinical laboratories. Taking the value of TEa from SCCL，39（67.24%）items had a σ metrics >3. Taking the maximum value of TEa，51（87.93%） items had a σ metrics >3，and 14（24.14%） items had a σ metrics >6. Taking the minimum value of TEa，12（20.69%）items had a σ metrics >3. Conclusions The mutual recognition quantitative items in Shanghai have good consistency among clinical laboratories. However，there are differences in determination results between clinical laboratories in different medical institutions for some items，which should be paid attention to.

Key words: External quality assessment, Sigma metrics, Mutual recognition, Quantitative determination item, Shanghai