From 2014 to 2016, Labthink organized three times of permeability proficiency service, which were supported by the laboratories both in China and abroad. Every year, there are more than 100 test organizations and laboratories registered to participate in the event.
The following results are based on analysis of Z-score statistics.
It can be seen from the last three years’ events that there were more skeptical results and outliers of results in 2015 compared to the results in 2014. However, in 2016, we got more skeptical data and outliers from the test results submitted by those laboratories, which proves that there is still a long way to go for those laboratories in improving the accuracy of permeability test data and solving the problems that cause inaccuracy of their test results.
Meanwhile, we can see that even for the same test item, the test results submitted by different laboratories show a great variation and that’s why we need push forward the uniformity of test data of laboratories.