| Clinical characteristics |
| Unusual sites |
| Associated with active disease and better when disease controlled |
| Associated with use of steroids (possibly indicating active disease) |
| Recurrent |
| Serious |
| Younger age |
| Abnormalities described |
| Abnormal fibrinolysis |
| Abnormal platelet aggregation |
| Activated protein C increased |
| Circulating immune complexes |
| Decreased antithrombin III |
| Factor V Leiden mutation |
| Increased cytokines (interleukin-6, thrombopoietin) |
| Increased factors V and VIII |
| Increased plasminogen activator inhibitor |
| Increased sedimentation rate, fibrinogen |
| Lupus anticoagulant |
| Thrombocytosis and leukocytosis (uniformly present in most studies) |
