laboratory diagnostic - coagulation - APTT (Activated Partial Thromboplastin Time), citrated plasma 2ml. It is advisable to send a frozen and centrifuged citrate sample in compliance with the GEHT pre-analytical recomendations. If possible, please specify if the patient is on an anticoagulant treatment as well as the clinical context. In the case of a request for aPTT without further precision, the following will be performed: FVIII, IX, XI, XII and lupus anticoagulant, The plasma must be frozen within 1 hour after collection and must be sent in the frozen samples container, Chronometric method, ssso, todylaboratories®, bmn, code L16LD1539