D dimer is a blood test that evaluates levels of a protein fragment when there's a clot hanging around in the bloodstream. If this level is elevated, it's often a tip-off that there was a tiny blood ...
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Does an elevated ultrasensitive D-dimer level in a patient whose pre-test probability puts him at low risk for pulmonary embolus (PE) indicate an increased risk for PE or deep venous thrombosis (DVT)?