Investigation of a prolonged aPTT: Data from a UK NEQAS for blood coagulation exercisePO-MO-120JENNINGS, I.KITCHEN, S.KITCHEN, D.WOODS, T.WALKER, I.Author informationUK NEQAS (Blood Coagulation), Sheffield, UKHaemophilia 18:p 102, July 2012.Copyright © 2012 Blackwell Publishing Ltd.