Vitamin K Blood Test: Normal Range and Interpretation
Vitamin K is a fat-soluble vitamin essential for blood clotting and bone health. The Vitamin K normal range is typically 0.2–3.2 ng/mL in blood. Low Vitamin K levels increase bleeding risk, while high levels usually reflect dietary intake or supplementation. This test helps evaluate clotting function and detect deficiency.
Contents
Result interpretation Vitamin K
What your result means based on common reference ranges
Vitamin K levels within 0.2–3.2 ng/mL indicate proper coagulation and normal bone metabolism function.
Mildly elevated Vitamin K levels often reflect increased dietary intake without clinical impact on coagulation balance.
Significantly high Vitamin K levels may result from excessive supplementation and can interfere with anticoagulant therapy effects.
Low Vitamin K levels impair clotting factor synthesis, increasing bleeding risk and indicating possible malabsorption or liver dysfunction.
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What is Vitamin K?
Vitamin K plays a central role in activating proteins required for blood coagulation and calcium binding in bone tissue. A Vitamin K blood test measures phylloquinone (K1) levels, reflecting dietary intake and absorption efficiency. It is clinically relevant in cases of bleeding disorders, liver dysfunction, or malabsorption syndromes. Low levels impair clotting factor synthesis, increasing bleeding risk, while normal levels support hemostasis and bone metabolism. The test is often interpreted alongside PT/INR to assess coagulation status and identify deficiencies or medication effects.
Reference ranges
Causes of abnormal values
Causes of low Vitamin K
- • Malabsorption syndromes — impaired fat absorption reduces Vitamin K uptake
- • Long-term antibiotic use — disruption of gut microbiota decreases endogenous Vitamin K production
- • Biliary obstruction — lack of bile prevents proper fat-soluble vitamin absorption
- • Poor dietary intake — insufficient consumption of green vegetables leads to deficiency
Causes of high Vitamin K
- • Excessive supplementation — high-dose Vitamin K intake exceeds physiological needs and accumulates in circulation
- • High leafy green intake — frequent consumption of kale or spinach increases Vitamin K levels
- • Vitamin K injections — recent therapeutic administration temporarily elevates blood concentration
- • High-fat diet — enhanced fat absorption increases uptake of fat-soluble vitamins
- • Liver dysfunction — impaired processing leads to accumulation in bloodstream
- • Multivitamin overuse — combined sources contribute to elevated Vitamin K levels
Vitamin K in combination with other markers
Possible symptoms
- •Easy bruising
- •Frequent nosebleeds
- •Bleeding gums
- •Heavy menstrual bleeding
- •Prolonged bleeding from cuts
When to see a doctor
Consult a doctor if Vitamin K levels fall below 0.2 ng/mL or if unexplained bleeding occurs. Seek medical advice if bruising appears without injury or if clotting abnormalities persist. Persistent abnormal results or symptoms require evaluation of liver function or nutrient absorption.
What to do if abnormal
- Increase intake of leafy greens consistently
- Maintain stable diet if using anticoagulants
- Address gut health and absorption issues
- Review supplements and avoid unnecessary high doses
- Monitor levels with follow-up blood tests
The information on this page is intended for general understanding of test results and does not replace medical consultation. Accurate interpretation requires considering other blood markers and individual factors.
Content is based on medical literature and used within the PulseBook analytical system.
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