Lab reference

INR

Coagulation

For education. Check every result.

Anatium is a study resource, not medical advice. Nothing here is a diagnosis, a prescription or a substitute for a clinician who has seen the patient. Check every number against a current local protocol before it touches anyone, and never act on a result you cannot reproduce yourself.

Reference range

Range0.9 to 1.1

About

The prothrombin time standardised between laboratories, so a warfarin target means the same thing anywhere.

When it is low

Usually not significant (goal 2-3 on warfarin)

When it is high

Over-anticoagulation, liver disease, vitamin K deficiency

The rest of Anatium

Lessons, flashcards, condition modules, the anatomy lab, clinical cases and the AI study assistant are free, and need an account.

Request access