Vitamin K is a nutrient that the body requires in small, regular amounts. It is essential for the formation of several substances called coagulation factors as well as protein C and protein S that work together to clot the blood when injuries to blood vessels occur.


Vitamin K deficiency is often discovered after unexpected or excessive bleeding occurs. A prothrombin time (PT/INR) is the main laboratory test used to investigate the bleeding. Low levels of vitamin K will have a prolonged result. Vitamin K will then be given by injection, and if the bleeding stops and the PT returns to normal, a vitamin K deficiency will be assumed as the cause.

This test as well as other coagulation tests may be performed to evaluate the symptoms of excessive bleeding and bruising. These tests are partial thromboplastin time (PTT), thrombin time, platelet count, platelet function tests, coagulation factor tests, fibrinogen, von Willebrand factor, and d-dimer.

Because measurements of the vitamin K level in the blood are rarely used to diagnose if a deficiency exist, this is not a routine test and will usually be performed in a reference laboratory. Result make take several days.


To detect vitamin K1 deficiency or toxicity, This test is rarely ordered. This test is not normally used to screen for or help diagnose vitamin K deficiencies because a lack of vitamin K is usually discovered when unexpected or excessive bleeding or easy bruising occurs. The primary test used to investigate the bleeding is prothrombin time (PT)


Low vitamin K level can lead to excessive bleeding and easy bruising.

    • Why do I need this test?

  • Low vitamin K level can lead to excessive bleeding and easy bruising.


Vitamin K1

Vitamin K1

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Note: The medical information provided here in this website is for informational purposes only and is not to be used as a substitute for professional medical advice, diagnosis or treatment.