INR Test
A standardized version of prothrombin time. Lets PT results be compared across labs and methods.
What is INR?
A standardized version of prothrombin time. Lets PT results be compared across labs and methods.
INR Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 0.800 – 1.10 ratio |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your INR result may mean
Higher than 1.1 in someone not on warfarin can indicate clotting issues. Therapeutic warfarin range is typically 2.0–3.0.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Sources
Frequently asked
No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.
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