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Warning Warning: This guideline is 189 day(s) past its review date.

INR is a specific measure of the level of anticoagulation from coumarin therapy (most common drug being Warfarin).

  • When monitoring coumarin therapy.
  • Secondary care may use as part of prognostic scores for liver damage.

Outside of coumarin monitoring an INR should not be checked.

As part of coumarin therapy monitoring.

A PDF summary document is available here.

Editorial Information

Last reviewed: 03/10/2023

Next review date: 03/10/2024

Version: 1

Approved By: National Demand Optimisation Group - Education Short Life Working Group