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VerifyNow™ aspirin and P2Y12 cartridge reactivity. Upper panel, percent inhibition of P2Y12 cartridge reactivity, normalized to baseline for values for each of nine study participants. Lower panel, Aspirin Reactivity Units (ARUs) for each of nine study participants at baseline, and study days 7, 14 and 21. ARU values < 550 indicate a response to aspirin (abnormal platelet response to arachidonic acid). In each panel, group means are indicated by a horizontal line. o.d., once daily.
