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Definition Return to top
Lupus anticoagulants are antibodies against phospholipids (substances in the lining of cells) that prevent blood clotting in a test tube. Persons with these antibodies may have an abnormally high risk of blood clotting.
See also: Antibody
Causes Return to top
Lupus anticoagulants are usually found in persons with autoimmune diseases, such as systemic lupus erythematosus (SLE).
They may also be found in persons who take certain medications, including phenothiazines, phenytoin, hydralazine, quinine, and the antibiotic amoxicillin.
Persons with inflammatory bowel disease (Crohn's disease and ulcerative colitis), infections, and certain tumors may have lupus anticoagulants.
Some people have no risk factors for this condition. In some cases, SLE is linked to an increased risk of blood clots and may be the cause of recurrent miscarriages.
Symptoms Return to top
There may be no symptoms.
Exams and Tests Return to topThe following tests may be done:
Treatment Return to top
No treatment is required when there are no symptoms. If clots occur, your health care provider may prescribe blood thinners (heparin followed by warfarin). Higher-than-usual doses of warfarin may be needed.
Outlook (Prognosis) Return to top
The outcome is usually good with appropriate therapy. Some patients have difficult-to-control clots with recurrent symptoms.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call your health care provider if you notice symptoms of a blood clot, which include swelling or redness in the leg, shortness of breath, or pain, numbness and pallor in an arm or leg.
Prevention Return to top
Awareness of risk factors may allow early diagnosis. Prevention may not be possible.
References Return to top
Harris ED, Budd RC, Genovese MC, Firestein GS, Sargent JS, Sledge CB. Kelley's Textbook of Rheumatology. 7th ed. St. Louis, Mo: WB Saunders; 2005.Update Date: 1/12/2009 Updated by: Todd Gersten, M.D., Hematology/Oncology, Palm Beach Cancer Institute, West Palm Beach, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.