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Lupus anticoagulant
- ... Autoimmune diseases, such as antiphospholipid antibody syndrome or lupus anticoagulant syndrome. These diseases cause your body to make proteins called antibodies. The antibodies related to these diseases cause too much clotting . But the results of a PTT test may show a slow clotting time. ... anything else I need to know about a PTT test? If your provider thinks you may have a clotting disorder linked to lupus, you may have a test called an LA- ...
