Test library
Phylloquinone Blood Test
The Vitamin K1 test measures phylloquinone, the form of vitamin K found in leafy green vegetables. It helps evaluate vitamin K status and supports the assessment of blood clotting, absorption, and bone health.
Order Vitamin K1 Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Vitamin K1 Test- Typical turnaround
- 1-3 business days
- Starting price
- From $192
- Results
- Confidential, online
Quick answer
The Vitamin K1 test measures phylloquinone in the blood. Vitamin K is a fat-soluble vitamin needed for normal blood clotting and for proteins involved in bone health. The test is typically ordered when a deficiency is suspected because of poor dietary intake, fat malabsorption, or a condition that affects how the body uses vitamin K. A healthcare provider interprets the result with the broader clinical picture.
What this test measures
Vitamin K comes in several forms. Vitamin K1, or phylloquinone, is the form found in green leafy vegetables and some plant oils, while vitamin K2 refers to a group of related compounds. The body uses vitamin K to activate several clotting factors made in the liver, and it also supports proteins that help regulate calcium in bone.
The test uses a blood sample, usually collected from a vein in the arm. Laboratories measure phylloquinone directly, and results are compared with reference ranges that can vary between laboratories. Because vitamin K is fat-soluble, conditions that reduce fat absorption can lower levels, so clinicians often interpret the result alongside other fat-soluble vitamin tests.
Testing may be considered for people with unexplained bruising or bleeding, chronic liver or bile duct conditions, or malabsorption disorders such as celiac disease or cystic fibrosis. It may also be used to assess nutritional status during long-term intravenous nutrition. Results alone do not diagnose a condition and are reviewed with a qualified healthcare provider.
- Phylloquinone (vitamin K1)
- Vitamin K2 (menaquinones)
- Prothrombin time (PT)
- International normalized ratio (INR)
- Clotting factor VII
- Clotting factor IX
- Protein C
- Protein S
- Calcium
- Osteocalcin
Why people order this test
- Evaluate suspected vitamin K deficiency
- Investigate easy bruising or unusual bleeding
- Assess fat absorption in digestive or liver conditions
- Support nutritional assessment during long-term intravenous nutrition
- Check vitamin K status when dietary intake is limited
- Follow up on abnormal clotting test results
How to prepare
No fasting is usually required, but the laboratory may request specific timing or additional preparation if other tests are ordered at the same time. A blood sample is drawn from a vein.
Understanding your results
Results are generally reported within one to three business days. The report shows the phylloquinone level, which a qualified healthcare provider interprets together with clotting tests and the person's diet and health history.
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Frequently Asked Questions
What does the vitamin K1 test measure?
It measures phylloquinone, the main dietary form of vitamin K, in the blood. Low levels can suggest inadequate intake or a problem with fat absorption.
Why would a doctor order a vitamin K1 test?
It may be ordered to investigate easy bruising or bleeding, to assess fat malabsorption, or to check nutritional status during long-term intravenous nutrition.
Do I need to fast for this test?
Fasting is usually not required. Follow the preparation instructions provided with the order, especially if other tests are included.
How quickly are results available?
Results are typically reported within one to three business days after the sample reaches the laboratory.
Can diet affect the result?
Yes. Vitamin K1 comes mainly from leafy green vegetables, so recent intake and overall diet are considered when the result is interpreted.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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