laboratory diagnostic - coagulation - Circulating anticoagulant - lupus anticoagulant, citrated plasma 2ml. sample to be frozen within 1 hour. Home sampling is not advisable. 1 specific aliquot for this analysis. Plasma with platelets removed by double centrifugation: 2500 g 15 min and settled plasma. The patient must not receive heparin. It is advisable to send a frozen and centrifuged citrate sample in compliance with the GEHT pre-analytical recomendations. It is advisable to collect the sample a while after any heparin treatment (NFH, LMWH, sodium danaparoid and rivaroxaban) During AVK treatment, lupus anticoagulant screening is possible up to an INR result of 3-3.5. The full test which includes the Rosner index and the dRVVT are systematically performed. The plasma must be frozen within 1 hour after collection and must be sent in the frozen samples container, Chronometric, todylaboratories®, code L76LD1534