Analyzing the 5-year-long inter-laboratory comparison results of occupational health test laboratories in Guangdong Province / 中国职业医学

ABSTRACT

OBJECTIVE: To analyze the inter-laboratory comparison results of occupational hygiene laboratories of Guangdong Province. METHODS: The 42 laboratories that continuously participated in the inter-laboratory comparison of occupational hygiene technical service institutions in Guangdong Province from 2014 to 2018 were selected as the research subjects Guangdong Occupational Health Test Center from 2014 to 2018 were selected by convenient sampling method. The data of detection of organic compounds, metal element, non-metal element in the workplace air, detection of metal element in biological materials, and the detection of free silica in dust were analyzed. The results were statistically analyzed by four-point robust statistical technique. RESULTS: From 2014 to 2018, a total of 1 205 items of sample detection results were submitted in these 5 years. The qualified rate of sample test was 92.4%(1 114/1 205) in these laboratories. The qualified rate of test of organics in workplace air, metals in workplace air, inorganic non-metals in workplace air, metals in biological materials and free silica in dust were 93.3%, 94.4%, 91.6%, 84.4% and 91.8% respectively. There was no significant difference in the qualified rate of sample test between the laboratories in the Pearl River delta in Guangdong Province and the laboratories in other regions the laboratories in other regions(92.8% vs 89.6%, P>0.05). There was no significant difference in the qualified rate of sample test among the occupational disease prevention and treatment institute, center for disease control and prevention and private laboratories(93.1% vs 93.6% vs 89.0%, P>0.05). Among the 91 unqualified items, 35 items were │z score of inter-laboratory(z_B)│≥ 3(38.5%), 40 items were │z score of within-laboratory(z_w)│≥ 3(44.0%), and 16 items were│z_B│≥ 3 and │z_w│≥ 3(17.6%). CONCLUSION: The laboratories in Guangdong Province that participated in the inter-laboratory comparison of occupational health test for 5 consecutive years have a relatively high level of occupational health testing, and the test results are accurate.