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| Serum dosages of antiphospholipid antibodies with intermediate or elevated titers on two occasions with an interval of at least 12 weeks |
| Lupic anticoagulante |
| Anticardiolipin antibody IgM and/or IgG |
| Anti-β2 glycoprotein |
IgM: immunoglobulin M; IgG: immunoglobulin G.
