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Vitamins

Vitamin K1 Blood Test

Vitamin K1 plays a key role in blood clotting and bone metabolism. Regular monitoring supports early detection of imbalances and preventive health management.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
nmol/l
Low 0.8 Normal 5.3 High
Female Your group
nmol/l
Low 0.8 Normal 5.3 High

Source: Clinical Diagnostics Nederland Reference population: Dutch adults (Clinical Diagnostics Nederland, serum)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Vitamin K1: what this test measures

This test measures the concentration of phylloquinone (vitamin K1) in your blood. It helps assess your vitamin K status and coagulation capacity.

Vitamin K1: why this value matters

Vitamin K1 is critical for proper blood clotting and may play a role in bone health. Low levels can be associated with excessive bleeding and may affect bone mineral density. Consult your healthcare provider for personalised interpretation.

Vitamin K1: how the blood test works

Referral
No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw
A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Which test
on its own €81,-
Where
650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Vitamin K1: when is testing worthwhile?

Testing may be recommended if you bruise easily, experience unexplained bleeding, take blood-thinning medication, or have conditions affecting fat absorption.

Vitamin K1: symptoms of a high or low value

Low Levels

Symptoms of low vitamin K1 may include easy bruising, prolonged bleeding from cuts, heavy menstrual periods, and blood in urine or stool. Severe deficiency can impair coagulation.

High Levels

Vitamin K1 toxicity from food sources is extremely rare. However, high intake may interact with blood-thinning medications. Discuss any supplementation with your healthcare provider.

Vitamin K1: lifestyle and this value

Eat plenty of green leafy vegetables such as kale, spinach, and broccoli. Consistent vitamin K intake is particularly important if you are on blood-thinning medication — discuss dietary changes with your healthcare provider.

Vitamin K1: frequently asked questions

What is the difference between vitamin K1 and K2?

Vitamin K1 is found mainly in leafy greens and is primarily involved in blood clotting. Vitamin K2 is found in fermented foods and animal products and may play a greater role in bone and cardiovascular health.

Can vitamin K affect my blood-thinning medication?

Yes, vitamin K can interact with certain blood-thinning medications. Maintain a consistent intake and consult your healthcare provider about any dietary changes.

How much vitamin K1 do I need daily?

Daily needs vary by age and sex. Your healthcare provider can advise you on the appropriate intake based on your individual health profile.

Vitamin K1: sources

  1. Clinical Diagnostics Nederland. Labgids: fytonadion / vitamine K1, referentiewaarden 0,8–5,3 nmol/l (serum). Geraadpleegd 14 juli 2026. (retrieved 2026) clinicaldiagnostics.nl

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Medical reviewer

Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
CIBG Ministerie van Volksgezondheid,
Welzijn en Sport Official BIG registration BIG 49928676701 Opens in a new tab

Vitamin K1

€81,-