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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 Range | Unit | Notes |
|---|---|---|
| 25 – 35 | seconds | — |
Critical (Panic) Values
Critical High: > 100 seconds. Values outside these limits require immediate clinical attention.
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Related Topics
coagulationheparinclotting factors