Thrombosis and haemostasis vol:70 issue:5 pages:852-857
In order to study the analytical performance of different commercial kits for determination of plasminogen activator inhibitor (PAI) activity we distributed eight selected split samples to 11 European laboratories experienced with haemostasis testing. Three different laboratories were involved in the production of data from each of the commercial kits tested. A considerable variation of PAI activity results reported from the laboratories testing the same commercial kits was observed. The range of reported results could in individual samples exceed the median value indicating an interlaboratory variation of more than 100%.