Vitamin K (Nutritional) Blood Test
£149 ✓ In Stock
Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.
After you receive your order confirmation email, please reply with your date of birth.
How it works
Your testing journey
From order to results in four simple steps. Full transparency on where each step happens and what it costs.
Receive your kit by post
Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.
Visit a partner clinic
Book a phlebotomy appointment at one of our 365+ UK partner clinics. Take your kit with you — the phlebotomist will collect your sample using the materials provided.
Phlebotomy fee applies (paid at clinic)
Venous blood draw at a clinic
A trained phlebotomist takes a small blood sample from a vein in your arm using the vacutainers provided in your kit. The appointment takes around 10 minutes.
Return by prepaid envelope
Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.
Venous Blood Collection Kit
This kit is sent to you and taken to your chosen clinic. The phlebotomist will collect your sample using the materials provided.
- 1Vacutainer blood collection tubes
- 2Needle and butterfly needle
- 3Tourniquet
- 4Alcohol swab
- 5Cotton wool and gauze
- 6Adhesive plaster
- 7Biohazard specimen bag
- 8Prepaid return envelope (Royal Mail Tracked 24)
- 9Laboratory request form
- 10Instructions for the phlebotomist
Vitamin K exists in two main forms: K1 (phylloquinone) and K2 (menaquinone). Vitamin K1 is found mainly in green leafy vegetables such as kale, spinach, broccoli, and Brussels sprouts. Vitamin K2 is found in fermented foods (particularly natto), cheese, egg yolks, and animal products, and is also produced by bacteria in your gut. Both forms are essential for proper blood clotting. Vitamin K activates clotting factors in the liver that help your body stop bleeding when injured. Without adequate vitamin K, even minor cuts or injuries could lead to excessive bleeding. Vitamin K2 plays a particularly important role in bone and cardiovascular health. It activates proteins that help direct calcium to your bones and teeth where it is needed, while preventing calcium from depositing in your arteries and soft tissues. This may help reduce the risk of osteoporosis and arterial calcification. Deficiency can occur in people with conditions affecting fat absorption (such as coeliac disease, Crohn's disease, or liver disease), those on long-term antibiotic therapy (which disrupts gut bacteria that produce K2), newborn babies, and people taking certain medications. Symptoms of deficiency include easy bruising, excessive bleeding from wounds, and in severe cases, bleeding gums or blood in urine or stool.
This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.
NO CLINICS, NO QUEUES, NO HASSLE
Four steps to clarity
01
Pick your panel
Browse over 200 clinically designed test kits and choose the one that fits your goals.
02
Kit to your door
Everything you need arrives in discreet packaging with step-by-step instructions inside.
03
Collect your sample
Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.
04
Insights delivered
Clear, easy-to-understand results sent to you online with actionable health guidance.
Frequently asked questions
No. Vitamin levels are not significantly affected by recent food intake.
Vitamin K is essential for blood clotting and bone metabolism. Deficiency can cause excessive bleeding and may contribute to osteoporosis. Testing is relevant if you have bleeding disorders, osteoporosis, or are taking warfarin (which works by blocking vitamin K).
Warfarin does not affect vitamin K levels directly but works by blocking vitamin K's action. If on warfarin, this test can check whether your dietary vitamin K intake is consistent.
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