INR (International Normalized Ratio)
INR shows how many times the clotting time differs from normal. It is used to monitor anticoagulant treatment.
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Normal ranges
Adults (no anticoagulants): 0.8–1.2.
Units: ratio
Causes of deviations
Low levels:
Usually has no meaning when no anticoagulant is taken.
High levels:
Anticoagulants, vitamin K deficiency, liver disease, clotting disorders.
When to see a doctor
If the value is outside the range, discuss it with your doctor, especially on anticoagulants.
Related biomarkers
Panels
Coagulation panel
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