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Medicines WarfarinQuestion & answer

Warfarin · Medicine question

Why do I need INR blood tests?

iatroX medicinesPublished 13 August 2026Updated 16 August 2026Reviewed 13 August 2026

The answer

Answer

INR shows how long your blood takes to clot and helps the anticoagulant service keep warfarin’s effect within the range selected for your condition.

Sources for this answer

NHSNHS · NHS medicine guidance

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The full medicine guide

Warfarin

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