In women, hormone therapy is a risk factor for venous thrombosis, a blood clot forming deep inside the vein. Although the disorder is rare, it increases exponentially during menopause and can be deadly. Hormone trials conducted thus far, focusing on proteins in blood coagulation, have not yet led to a risk profile, precluding identification of women at risk. Mayo Clinic researchers have now developed a novel concept that uses blood platelets to define thrombotic risk.
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