Cases :

Patients with SLE and/or APL and first documented deep vein thrombosis episode (minimum 6 months, maximum 6 years)

Any weight and height

Absence of current anticoagulant treatment but possibility of platelet function inhibitory treatment; actual guidelines suggest long-term anticoagulant treatment in patients with first episode of venous thrombosis and having APL; however, these patients can be studied if they are in one of these circumstances: 1/ "inconvenient" stop by patient, 2/ aspirin decided by doctor after prolonged treatment

Controls:

Patients with SLE and/or APL without thrombosis (venous or arterial)

Any weight and height

Possibility of platelet function inhibitory treatment (primary prophylaxis of arterial manifestations)

Hypercoagulable Phenotype by Thrombinography (in Presence of C Protein Dynamic Inhibitory System)

What this study is about