activated partial thromboplastin time


activated partial thromboplastin time
(APTT) (aPTT) the period required for clot formation in recalcified blood plasma after contact activation and the addition of platelet substitutes (e.g., brain cephalin or similar phospholipids); used to assess the intrinsic and common pathways of coagulation. A prolonged aPTT can indicate a deficiency of a number of factors, including prekallikrein, high-molecular-weight kininogen, factors XII, XI, IX, VIII, X, V, and II, and fibrinogen.

Medical dictionary. 2011.

Look at other dictionaries:

  • Partial thromboplastin time — The partial thromboplastin time (PTT) or activated partial thromboplastin time (aPTT or APTT ) is a performance indicator measuring the efficacy of both the intrinsic (now referred to as the contact activation pathway) and the common coagulation… …   Wikipedia

  • partial thromboplastin time — (PTT) a measure of the coagulation factors of the intrinsic pathway of coagulation in plasma; now largely superseded by the test of activated partial thromboplastin t …   Medical dictionary

  • time — 1. That relation of events which is expressed by the terms past, present, and future, and measured by units such as minutes, hours, days, months, or years. 2. A certain period during which something definite or determined is done. SYN: tempus (2) …   Medical dictionary

  • Prothrombin time — The prothrombin time (PT) and its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) are measures of the extrinsic pathway of coagulation. They are used to determine the clotting tendency of blood, in the measure… …   Wikipedia

  • APTT — • activated partial thromboplastin time …   Dictionary of medical acronyms & abbreviations

  • aPTT — • activated partial thromboplastin time …   Dictionary of medical acronyms & abbreviations

  • APTT — Activated partial thromboplastin time (Medical » Laboratory) * Activated Plasma Thromboplastin Time (Medical » Laboratory) …   Abbreviations dictionary

  • PTTK — partial thromboplastin time with kaolin, also known as activated partial thromboplastin time (APTT): a method for estimating the degree of anticoagulation induced by heparin therapy for venous thrombosis …   Medical dictionary

  • PTTK — partial thromboplastin time with kaolin, also known as activated partial thromboplastin time (APTT): a method for estimating the degree of anticoagulation induced by heparin therapy for venous thrombosis …   The new mediacal dictionary

  • aPTT — Activated partial thromboplastin time (Tiempo de tromboplastina parcial activada) …   Diccionario de siglas médicas y otras abreviaturas