Lab test

Vitamin K1 Test - Vitamin Deficiency

This blood test evaluates vitamin K1 (phylloquinone) levels to help determine whether a deficiency is present.

Typical price

From $192

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This blood test evaluates vitamin K1 (phylloquinone) levels to help determine whether a deficiency is present. Vitamin K is a fat-soluble vitamin that is essential for blood clotting and also plays a role in bone health. The test may be ordered when a provider suspects a deficiency related to fat malabsorption, liver conditions, or long-term poor nutrition, or when unusual bleeding or bruising is being evaluated. Because vitamin K1 is fat-soluble and depends on normal fat absorption, results are interpreted with your diet, history, and clotting tests.

• Vitamin K1 (phylloquinone) Measures the level of this fat-soluble vitamin in the blood.

• People with unusual bleeding or bruising being evaluated
• Individuals with fat malabsorption or liver conditions
• People with prolonged poor nutrition or restricted diets
• Those taking medicines that affect vitamin K

• Fasting is often requested before the draw.
• Tell the collector about vitamin K supplements or blood-thinning medicines you take.
• Follow any instructions provided for your specific panel.

A low vitamin K1 level may suggest deficiency, which can relate to poor absorption, liver function, or diet. High levels are uncommon and are usually related to supplements. Because vitamin K interacts with blood clotting and some medicines, results should be interpreted by a provider alongside clotting tests and your history. Discuss them before making any changes.

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