Ihrombosis and Haemostasis-@ E K. SchattauerVerlagsgesellschaft mbH (Stuttgart) 67 (6) 725 (1992) Artificial Prolongation of the Prothrombin Time of Lyophilized Plasma lnduced by Transportation with Solid Garbon Dioxide Dear Sir, In The Netherlands, external quality assessment (EOA) of coagulation assays (prothrombin time, activated partial thromboplastin time, fibrinogetr, factor VIII) is performed by a national committee. In bimonthly surv€yS, sets of three lyophilized citrate plasma samples are mailed to 120 participants. The samples are Lyophilized plasma samples could be shipped without dry ice altogether.
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