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Medical Dictionary

plasma thromboplastin antecedent

noun plasma thromboplastin an·te·ced·ent \-ˌant-ə-ˈsēd-ənt\

Medical Definition of plasma thromboplastin antecedent

  1. :  a clotting factor whose absence is associated with a form of hemophilia—abbreviation PTA; called also factor XI

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