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hematologyHas Critical Values
Prothrombin Time / INR
PT/INR· also: INR, PT/INR
Clinical Overview
PT measures how long it takes blood to clot via the extrinsic pathway. INR standardizes PT results globally. Used to monitor warfarin therapy and assess liver function.
Reference RangesWHO/IFCC standards
| Reference Range | Unit | Notes |
|---|---|---|
| 11 – 13.5 | seconds | PT |
Also reported in: INR.
Critical (Panic) Values
Critical High: > 5 seconds. Values outside these limits require immediate clinical attention.
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Related Topics
coagulationwarfarinliverclotting