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hematologyHas Critical Values

Activated Partial Thromboplastin Time

aPTT· also: APTT, PTT

Clinical Overview

aPTT measures clotting via the intrinsic pathway. Used to monitor heparin therapy and detect clotting factor deficiencies. Prolonged aPTT suggests coagulation disorders.

Reference RangesWHO/IFCC standards

Reference RangeUnitNotes
25 – 35seconds

Critical (Panic) Values

Critical High: > 100 seconds. Values outside these limits require immediate clinical attention.

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Related Topics

coagulationheparinclotting factors

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