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"One of those tests, a blood-coagulation test known as prothrombin time, measures how long it takes blood to clot and is often used by doctors to determine which dosage of the blood thinner warfarin to give patients.

Wrong prothrombin time results could cause doctors to prescribe too little or too much warfarin. Too much of the drug, also known by its brand name Coumadin, can cause fatal bleeding, while too little can leave patients vulnerable to clots and strokes, according to medical experts."

Huge free market failure here. Thank god we still have some working government regulation in this country.

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