---
title: INR Test
type: biomarker
url: "https://www.test-well.com/biomarkers/inr"
also_known_as:
  - inr
  - international normalized ratio
category: Metabolic Health
units:
  - ratio
order_price_usd: 23.99
order_item: Prothrombin Time with INR
order_url: "https://www.test-well.com/tests/prothrombin-time-inr"
reviewed_at: 2026-09-05
---

# INR

> INR is measured with a standard blood draw; no fasting is needed. A typical reference range is 0.800 – 1.10 ratio. At TestWell it's $23.99 all-in as Prothrombin Time with INR, results in 1–3 business days, drawn at Quest. An out-of-range result is a prompt to look closer, not a diagnosis.

Also known as: inr, international normalized ratio.

## Key facts

| Fact | Value |
| --- | --- |
| Units | ratio |
| Sample | Blood draw |
| Fasting | Not required |
| Results | 1–3 business days |
| Price | $23.99 |
| Labs | Quest |

## What does INR measure?

A standardized version of prothrombin time. Lets PT results be compared across labs and methods.

## What is the normal range for INR?

| Population | Reference range |
| --- | --- |
| age 18+ | 0.800 – 1.10 ratio |

Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them.

## What does a high INR mean?

Higher than 1.1 in someone not on warfarin can indicate clotting issues. Therapeutic warfarin range is typically 2.0–3.0.

## How do you get tested for INR?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Prothrombin Time with INR](https://www.test-well.com/tests/prothrombin-time-inr) | Single test | $23.99 | This marker |
| [Blood Clotting Panel](https://www.test-well.com/tests/blood-clotting-panel) | Panel | $149.99 | 4 tests |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | Yes | $23.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| Labcorp | No | — | Not offered through Labcorp for this test. |
| BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. |

- [What a high INR means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/inr/high)
- [What a low INR means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/inr/low)

## Common questions about INR

### Do I need a doctor's order to test my inr?

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.

### How long does it take to get INR results?

Most INR results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal.

### How much does a INR test cost?

Our Prothrombin Time with INR starts at $23.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted.

### Do I need to fast before my INR test?

Fasting is not required for the INR test. You can have your blood drawn any time of day.

### Which lab will process my INR test?

Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations.

## Sources

- [AACC Lab Tests Online](https://www.testing.com/tests/prothrombin-time-and-international-normalized-ratio-pt-inr/)
- [MedlinePlus (NIH) — Prothrombin Time Test and INR (PT/INR)](https://medlineplus.gov/lab-tests/prothrombin-time-test-and-inr-ptinr/)

## Related biomarkers

- [Glucose](https://www.test-well.com/biomarkers/glucose)
- [Creatinine](https://www.test-well.com/biomarkers/creatinine)
- [eGFR](https://www.test-well.com/biomarkers/egfr)
- [BUN](https://www.test-well.com/biomarkers/bun)
- [ALT](https://www.test-well.com/biomarkers/alt)
- [AST](https://www.test-well.com/biomarkers/ast)

- [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup)
- [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter)
- [All biomarkers](https://www.test-well.com/biomarkers)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md

Canonical page: https://www.test-well.com/biomarkers/inr
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.