Lab marker · Low

Low Vitamin K: what it means

A Vitamin K result below the normal range is considered low. Here is what a reduced Vitamin K can point to, and when it is worth discussing with a doctor.

Reference range: ~0.5–3.0 nmol/L; needed for blood clotting — deficiency is usually detected through a raised INR rather than by measuring the vitamin directly

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What a low Vitamin K can mean

  • Fat malabsorption — liver, pancreatic or bowel disease; the commonest adult cause.
  • Poor intake, or antibiotics reducing gut bacteria.
  • Warfarin — deliberately antagonises vitamin K (this is how it thins the blood).
  • Effect — a raised INR/prothrombin time, easy bruising and bleeding.
  • Newborns — naturally low; given vitamin K at birth to prevent bleeding.

When to discuss with a doctor

Vitamin K deficiency is usually recognised through its effect — a prolonged prothrombin time or raised INR with bruising or bleeding — rather than by measuring the vitamin, which is not a routine test. It is worth considering in someone with fat malabsorption or liver disease who has unexplained bleeding or a raised INR, where giving vitamin K can correct it. In an emergency, a dangerously high INR (whether from warfarin or liver disease) with bleeding is treated urgently, sometimes with vitamin K. Newborns receive vitamin K routinely to prevent bleeding. Mediora.AI shows the INR alongside liver markers so a vitamin K-related clotting problem is visible in context; the interpretation and treatment belong with your doctor.

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.