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Activated Partial Thromboplastin Time (aPTT) measures how long your blood takes to clot through the intrinsic pathway. It evaluates key clotting factors and screens for bleeding disorders. Prolonged aPTT can indicate hemophilia, von Willebrand disease, heparin therapy effects, or lupus anticoagulant.
Also known as: Activated Partial Thromboplastin Time, aPTT, Partial Thromboplastin Time, PTT, 表面诱导型凝血过程
High aPTT results from hemophilia, von Willebrand disease, heparin therapy, or lupus anticoagulant. Low aPTT may indicate a hypercoagulable state.
Standard range is 25-35 seconds. Functional mid-range is 28-32 seconds.