High INR (prothrombin time): what it means
A INR (prothrombin time) result above the normal range is considered high. Here is what a raised INR (prothrombin time) can point to, and when it is worth discussing with a doctor.
Reference range: ~0.8–1.2 off treatment; therapeutic target on warfarin is usually 2.0–3.0 (higher for some indications) — read against why it was ordered
Understand your full resultWhat a high INR (prothrombin time) can mean
- Warfarin effect — the intended action; too high means over-anticoagulation and bleeding risk.
- Liver disease — reduced synthesis of clotting factors; a rising INR tracks worsening liver function.
- Vitamin K deficiency — poor diet, malabsorption, some antibiotics.
- Disseminated intravascular coagulation (DIC) — clotting factors consumed in serious illness.
- Direct oral anticoagulants and some other drugs — can prolong it (though these aren't monitored by INR).
When to discuss with a doctor
The INR is only meaningful once you know why it was done. On warfarin, it guides dosing: too high raises bleeding risk (and a very high INR with any bleeding needs urgent care and reversal), too low leaves you under-protected from clots — both are reasons to contact the clinic managing your warfarin. Off anticoagulation, an unexpectedly high INR is a meaningful sign of liver dysfunction or vitamin K deficiency and should be evaluated. Mediora.AI reads the INR against its target where warfarin is involved, and alongside the liver markers otherwise; dose changes and the clinical decision belong with the team managing your anticoagulation or liver care.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.