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Vitamin K (Nutritional)
153.99
The Vitamin K (Nutritional) blood test assesses vitamin K levels needed for normal blood clotting and bone health. It helps identify deficiency that may increase bleeding risk.
Turnaround time
2 weeks
Biomarkers count
1
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Vitamin K (Nutritional)
What is the Vitamin K (Nutritional) test?
The Vitamin K (Nutritional) test measures the body’s vitamin K status, a fat-soluble vitamin essential for normal blood clotting and bone metabolism. Vitamin K is required to activate clotting factors and proteins involved in calcium regulation in bones.
Dietary vitamin K comes mainly from green leafy vegetables (vitamin K1) and fermented foods or gut bacteria (vitamin K2). Blood testing is useful when deficiency is suspected, especially in people with malabsorption, liver disease, or prolonged antibiotic use.
Clinically, this test is used to assess unexplained bleeding, monitor nutritional status, and support bone and cardiovascular health evaluations.
Why do I need a test for Vitamin K (Nutritional)?
Vitamin K deficiency can impair blood clotting, increasing the risk of bruising or bleeding. It is more likely in people with fat-malabsorption disorders, liver disease, prolonged antibiotic use, or inadequate dietary intake.
Because early deficiency may not cause obvious symptoms, testing helps identify low levels before complications occur. It also supports safe monitoring in individuals at risk of imbalance.
You may need a Vitamin K test if you experience:
- Easy bruising or prolonged bleeding
- Frequent nosebleeds or gum bleeding
- Digestive or fat-absorption disorders
- Long-term antibiotic use
- Liver disease
- Poor dietary intake of leafy greens
Benefits of the Vitamin K (Nutritional) test
- Assesses clotting support
Evaluates vitamin K availability for normal coagulation. - Detects deficiency early
Identifies low levels before bleeding complications arise. - Supports bone health assessment
Vitamin K plays a role in bone mineralisation. - Relevant for digestive disorders
Useful in malabsorption and liver conditions. - Guides dietary optimisation
Helps tailor nutrition to restore adequate intake. - Improves bleeding risk evaluation
Supports investigation of unexplained bruising or bleeding. - Supports cardiovascular health context
Vitamin K is involved in calcium regulation in blood vessels. - Improves diagnostic clarity
Differentiates nutritional deficiency from clotting disorders.
Step-by-step – How we offer this test
Option 1: Clinic-based blood test (UK-wide)
- Choose your nearest UK clinic
- Attend your appointment
- A clinician draws a blood sample
- Results are processed and reported
Option 2: Home or hotel visit (+£60, UK-wide)
- A qualified phlebotomist visits your location
- Blood sample taken at home or in your hotel
- No travel or waiting required
- Results handled the same as clinic testing
Your results explained
Low Vitamin K levels
Low vitamin K indicates reduced availability for clotting factor activation, increasing bleeding risk.
UK reference range (low):
- < 0.2 µg/L
Low levels may be associated with easy bruising, prolonged bleeding, and bone health issues.
Normal Vitamin K levels
Normal levels suggest adequate vitamin K availability for clotting and bone metabolism.
UK reference range (normal):
- 0.2 – 3.2 µg/L
Within this range, vitamin K deficiency is unlikely.
High Vitamin K levels
High vitamin K levels are uncommon and usually related to supplementation. Toxicity is rare.
UK reference range (high):
- > 3.2 µg/L
High levels are generally not harmful but should be interpreted in context.
How It Works
Simple steps to get your results
1
Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
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Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
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Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
It measures vitamin K nutritional status related to clotting and bone health.
Fasting is not usually required, but supplement use should be disclosed.
It is uncommon in healthy adults but more likely in people with malabsorption or liver disease.
Yes. Vitamin K deficiency can impair clotting and increase bleeding risk.
Yes. It supports calcium binding in bone proteins.
Yes. Long-term antibiotic use can reduce vitamin K production by gut bacteria.
Yes. Vitamin K supplements can raise blood levels.
Yes. It can help assess bleeding risk in selected cases.
Testing is usually done when deficiency is suspected or risk factors are present.
High levels are rarely harmful and toxicity is uncommon.
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