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  2. 2. Visit a Lab

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  3. 3. Get Your Results

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Vitamin K Test

This Vitamin K Test is used to measure levels of vitamin k in the blood in order to help diagnose deficiencies.

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Test Preparation:
Fasting is required (i.e. no eating or drinking anything besides water for 8 hours prior to testing). Patients should abstain from consuming liver, multivitamins or vitamin K for a 24 hour period before testing.
Testing Method:
Blood draw

This Vitamin K Test is used to measure levels of vitamin k in the blood in order to help diagnose deficiencies. Vitamin K is required for proper blood clotting and low levels can increase your risk of uncontrolled bleeding. Those with a vitamin K deficiency are more prone to bruising and osteoporosis. Green vegetables are an excellent source of vitamin K and an easy way to increase your levels if your Vitamin K Test should return lower results than typical.

How the Vitamin K Test Works

If you need to have a vitamin K test, start by adding the test to your cart and checking out. Once you’ve purchased the test, you will need to plan ahead for when you plan to take it. While you do not need an appointment, you will need to fast for at least eight hours before the test. Plan not to eat or drink anything but water the night before the test. Then, when it’s convenient for you, come into one of our more than 4,000 testing facilities across the nation. One of our qualified technicians will perform a blood draw, and you can be on your way, often in as little as 30 minutes. Then, within a 24-72 hours, you will be able to access your test results from our convenient online portal.

Who Needs a Vitamin K Test?

Tests for vitamin K deficiency are fairly uncommon. In most cases, vitamin K deficiency is identified because the patient suffers from excessive bruising or bleeding, which often indicates vitamin K deficiency. However, a vitamin K test can provide insight into how long it takes your blood to clot. Some newborns, especially those who did not receive vitamin K shots at birth, may also need to have their vitamin K levels tested to determine whether they need vitamin K shots or supplements. 

Reading and Interpreting Your Vitamin K Test Results

When you receive the results of your vitamin K test, you will see three clear columns. First, you will see a column that lays out normal vitamin K range: the range that you would hope, under normal circumstances, to have. Then, you will see the results column, which will include your specific vitamin K results, quantified. Finally, the “flag” column will let you know whether your results are within normal range. If you do not understand the results of your test, you may need to speak with a care counselor to further understand the results. 

Vitamin K Test vs. Comprehensive Vitamin Panel

A vitamin K test is intended specifically to measure the levels of vitamin K in your blood, and is usually performed in response to a known problem, including easy bleeding. If you do not have a reason to specifically have a vitamin K test, you may want to have a Comprehensive Vitamin Panel to test for overall nutritional deficits and problems. Often, a Comprehensive Vitamin Panel is recommended when you are suffering from overall fatigue, joint pain or soreness, or malaise, since vitamin deficiencies can often cause generalized health problems. You might choose a Comprehensive Vitamin Panel test because you know that something might be wrong and want to rule out any potential nutritional deficits, while a Vitamin K Test is a more specific test.


  • Vitamin K tests are usually recommended by a doctor in response to heavy bleeding or bruising. 

  • At Priority Lab Testing, our care counselors will provide you with information about how to read the results of your test. After the test, if you need additional medical care, we can link you to a member of our network of physicians.

  • A doctor can provide you with more information about your next steps after a vitamin K test, including what to do if your levels are low. Priority Lab Testing can help connect you with a recommended local physician.