Normally, when bleeding begins, a complex series of chemical events produces a "plug" to stop the bleeding; this plug is called a fibrin clot. The fibrin clot is the end-product of many different "clotting factors" reacting in the blood. Hemophilia is an inherited condition in which one of these clotting factors (factor VIII or IX) is absent from the blood, so that it does not clot normally. If your health care provider suspects that you have hemophilia, you may be given blood tests to examine how...
As many as 100,000 people in the United States have the disease, which causes red blood cells to resemble sickles or crescents. The misshapen cells can reduce blood flow, which starves vital organs of oxygen and can lead to chronic fatigue and intense pain.
Many people who don't have the disease carry a gene for it. Screening is essential, a message Tate will spread this month via Facebook and Twitter (@LarenzTate). "If you can prevent the disease, you can really make a difference in someone's life," says Tate.
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