Contrary to what has been suggested, it appears genetic tests do not help to predict optimal doses of the blood thinner warfarin for patients.This was the finding of a late-breaking clinical trial whose results were presented at the American Heart Association's Scientific Sessions 2013 in Dallas, TX, recently.It is important to get the dose of warfarin right for individual patients. If the dose is too high, there is a risk of internal bleeding, and if it is too low, it can lead to potentially life-threatening blood clots.

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