---
title: Vitamin K1 Test
type: biomarker
url: "https://www.test-well.com/biomarkers/vitamin-k1"
also_known_as:
  - vitamin k1
  - phylloquinone
category: Vitamins & Nutrients
units:
  - ng/mL
order_price_usd: 36.99
order_item: Vitamin K
order_url: "https://www.test-well.com/tests/vitamin-k-test"
reviewed_at: 2026-09-05
---

# Vitamin K1

> Vitamin K1 is measured with a standard blood draw; no fasting is needed. A typical reference range is 0.100 – 2.20 ng/mL. At TestWell it's $36.99 all-in as Vitamin K, results in 5–7 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.

Also known as: vitamin k1, phylloquinone.

## Key facts

| Fact | Value |
| --- | --- |
| Units | ng/mL |
| Sample | Blood draw |
| Fasting | Not required |
| Results | 5–7 business days |
| Price | $36.99 |
| Labs | Quest or Labcorp |

## What does Vitamin K1 measure?

A fat-soluble vitamin essential for blood clotting and bone health.

## What is the normal range for Vitamin K1?

| Population | Reference range |
| --- | --- |
| age 18+ | 0.100 – 2.20 ng/mL |

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 low Vitamin K1 mean?

Can reflect fat-malabsorption disorders, antibiotic use, or anticoagulant therapy.

## How do you get tested for Vitamin K1?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Vitamin K](https://www.test-well.com/tests/vitamin-k-test) | Single test | $36.99 | This marker |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | Yes | $36.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| Labcorp | Yes | $36.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. |

- [What a low Vitamin K1 means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/vitamin-k1/low)

## Common questions about Vitamin K1

### Do I need a doctor's order to test my vitamin k1?

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 Vitamin K1 results?

Most Vitamin K1 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 Vitamin K1 test cost?

Our Vitamin K starts at $36.99. 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 Vitamin K1 test?

Fasting is not required for the Vitamin K1 test. You can have your blood drawn any time of day.

### Which lab will process my Vitamin K1 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

- [Mayo Clinic Labs](https://www.mayocliniclabs.com/test-catalog/overview/42365)
- [Testing.com (AACC) — Vitamin K1 Test: Check Your Levels, Get Results](https://www.testing.com/tests/vitamin-k/)

## Related biomarkers

- [Vitamin D, 25-Hydroxy](https://www.test-well.com/biomarkers/vitamin-d-25-hydroxy)
- [Vitamin B12](https://www.test-well.com/biomarkers/vitamin-b12)
- [Methylmalonic Acid](https://www.test-well.com/biomarkers/methylmalonic-acid)
- [Folate](https://www.test-well.com/biomarkers/folate)
- [Vitamin A (Retinol)](https://www.test-well.com/biomarkers/vitamin-a-retinol)
- [Vitamin B1 (Thiamine)](https://www.test-well.com/biomarkers/vitamin-b1-thiamine)

- [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/vitamin-k1
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.