A discordant, falsely low activated partial thromboplastin time (aptt) result was obtained on a patient sample on a bcs xp system (serial number: (b)(4)) using actin fsl reagent.The discordant result was reported to the physician(s).The sample was repeated for aptt on an alternate bcs xp system (serial number: (b)(4)), recovering higher.This higher result was reported, as the correct result, to the physician(s).The sample was then repeated on bcs xp system (serial number: (b)(4)), also recovering higher.There are no known reports of patient intervention or adverse health consequences due to the discordant, falsely low activated partial thromboplastin time (aptt) result.
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