Annexin V: A substance that normally forms a shield around certain phospholipid molecules in the blood, blocking their entry into coagulation (clotting) reactions. Annexin V is thought to be a cause of antiphospholipid syndrome.
Quick GuideWomen's Health: Nutrition and Health Care Reform
Subscribe to MedicineNet's Women's Health Newsletter
Women's Health Resources
Last Editorial Review: 7/1/2016