Vitamins & Nutrients Updated Apr 17, 2026

Vitamin K

Vitamin K is a lab value used to show the level of vitamin K in a blood sample. On a lab report, it helps describe whether the measured Vitamin K is within the normal range or outside it. In the Vitamins & Nutrients panel, a Vitamin K test can be used to track nutrition patterns, supplement use, and other factors that influence blood levels.

What Is Vitamin K?

Vitamin K is a lab value that measures the amount of vitamin K in blood. It reflects how much of this nutrient is circulating in the sample at the time of the Vitamin K test. On a lab report, Vitamin K on a blood test is read as part of a Vitamins & Nutrients panel, not as a single stand-alone snapshot of health. The Vitamin K result helps describe blood nutrient status in a simple, numeric way.

Why Is Vitamin K Tested?

Vitamin K is tested in a Vitamins & Nutrients panel, sometimes alongside other micronutrient markers. The Vitamin K test is usually ordered to assess nutrient status in a broad lab review or to follow up on changes in diet, supplements, or absorption patterns. It can add context to other blood values by showing whether vitamin intake and circulation appear balanced. Vitamin K on a lab report is often one part of a larger nutrient profile rather than a separate panel by itself.

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Vitamin K Normal Range

Group Range Unit
Adult Male 0.2–1.5 ng/mL
Adult Female 0.2–1.5 ng/mL

Reference ranges may vary by laboratory and individual factors.

What Does High Vitamin K Mean?

A high Vitamin K test result generally means more vitamin K was measured in the blood sample than expected for the Vitamin K reference range. In broad terms, high Vitamin K can reflect recent intake, supplement use, or concentrated blood volume from less plasma water. A result that is above the lab's range may be reported as high Vitamin K, depending on the method and unit used. Many labs consider values above the stated Vitamin K normal range to be elevated, but the cutoff depends on the assay.

Associated factors

Recent supplement use — extra intake can temporarily increase the measured Vitamin K level.
Vitamin K-rich diet — a recent meal pattern with more vitamin K can raise the blood value.
Dehydration — reduced plasma volume can concentrate the measured Vitamin K in the sample.
Exercise before the draw — fluid shifts can slightly change the apparent Vitamin K result.
Altitude exposure — lower plasma volume can concentrate blood measurements, including Vitamin K.
Smoking — blood chemistry shifts linked with smoking may influence Vitamin K levels.
Hormone-related changes — pregnancy and other hormone shifts can alter nutrient handling and measured Vitamin K.
Medication category effects — some medicines can change vitamin metabolism or transport, affecting Vitamin K on a lab report.

What Does Low Vitamin K Mean?

A low Vitamin K test result generally means less vitamin K was measured in blood than expected for the Vitamin K normal range. In practical terms, low Vitamin K can reflect low intake, reduced absorption, or faster use of the nutrient in the body. A value below the lab's Vitamin K reference range is often described as low Vitamin K on a blood test. Because reference intervals vary by method, the same number may be normal in one lab and low in another.

Associated factors

Low dietary intake — not getting enough vitamin K over time can reduce the measured level.
Poor absorption patterns — less vitamin K may reach the bloodstream when absorption is limited.
Recent fasting or low-fat intake — vitamin K is fat-soluble, so very low fat intake can affect blood levels.
Certain digestive procedures — changes in the digestive tract can reduce vitamin K uptake.
Medication category effects — some medicines can change vitamin handling or lower measured Vitamin K.
High fluid intake before testing — extra plasma water can dilute the measured result.
Rapid changes in body weight — shifts in nutrition and body stores can move Vitamin K downward.
Laboratory method differences — a Vitamin K test may read lower or higher depending on assay design.

How Vitamin K Relates to Other Values

Vitamin K is often read with other blood markers in the same Vitamins & Nutrients panel or broader lab review. When Vitamin K is reviewed alongside hematocrit (Hct), red blood cell count (RBC), and mean corpuscular volume (MCV), the combination helps describe blood composition in a wider context. Vitamin K may also be compared with hemoglobin (Hgb) and ferritin when the lab report is looking at nutrient patterns rather than one number alone. These related markers do not measure the same thing, but they help place a Vitamin K test result in context.

What Factors Affect Vitamin K Levels?

Vitamin K can vary with age, sex, diet, supplement use, and body fluid balance. A Vitamin K on a blood test may also shift with recent exercise, time of day, and altitude-related fluid changes. Different laboratory methods can produce slightly different reference ranges, so the Vitamin K normal range is method-specific. Women and men may show small differences because of hormone-related and body-composition differences. A Vitamin K test result can change between tests even when the person is generally stable, especially if diet or supplements change.

How It Is Tested

Vitamin K is measured from a blood draw, and the sample is sent to a lab for analysis. The lab report may list Vitamin K in units such as ng/mL or another assay-specific unit, depending on the method. On a blood test, the result is compared with the lab's reference interval to show whether it falls in the Vitamin K normal range.

How to Prepare

No fasting is usually required for a routine Vitamin K test, but the lab's instructions may vary. Supplements, recent meals, and hydration can affect the result, so timing matters for comparison across tests.

Frequently Asked Questions

What is the normal range for Vitamin K?
The Vitamin K normal range depends on the lab method, but a commonly cited adult reference interval is about 0.2 to 1.5 ng/mL. A Vitamin K test result should always be compared with the range printed on the same lab report. The phrase Vitamin K reference range is important because different assays can use different cutoffs.
What does Vitamin K stand for?
Vitamin K does not stand for another word in this lab context; it is the name of the nutrient being measured. In a blood test, Vitamin K refers to the measured amount of vitamin K in the sample. The label on the report may use the full name and the abbreviation together.
What does a high Vitamin K mean on a lab report?
A high Vitamin K on a lab report usually means the measured level is above the Vitamin K normal range used by that lab. It can reflect recent supplement use, a vitamin K-rich meal pattern, or a concentrated sample from lower plasma volume. A high Vitamin K result is interpreted using the lab's own reference interval and test method.
What does a low Vitamin K mean on a lab report?
A low Vitamin K on a lab report means the measured level is below the lab's Vitamin K reference range. It can be linked with low intake, absorption differences, or dilution from extra body water. The exact meaning depends on the Vitamin K test method and the rest of the lab report.
Can diet affect Vitamin K?
Yes, diet can affect Vitamin K because this value reflects a nutrient in the blood. Recent intake, supplement use, and fat content of meals can all shift the Vitamin K test result. That is why Vitamin K on a blood test can vary from one draw to the next.
What is the difference between Vitamin K and hematocrit (Hct)?
Vitamin K measures a nutrient in blood, while hematocrit (Hct) measures the proportion of blood made up by red blood cells. They answer different questions on a lab report, but both can change with hydration and overall blood composition. Vitamin K on a blood test is not the same type of value as Hct.
What unit is Vitamin K measured in?
Vitamin K is commonly reported in ng/mL, though the unit can vary by lab method. Some reports may use a different unit or display the value as part of the assay format. The unit printed beside the Vitamin K test result should be used when comparing values.
How much can Vitamin K change between tests?
Vitamin K can change by a noticeable amount between tests if diet, supplements, hydration, or exercise change. Small shifts may also come from normal biological variation and lab method differences. For that reason, the Vitamin K test result is best compared with the same lab and similar testing conditions when possible.
Is Vitamin K different for men and women?
Some labs use the same Vitamin K normal range for adult men and adult women, while others may publish slightly different reference intervals. Small differences can appear because of body composition, hormone-related changes, and sample variation. The range on the specific lab report is the one used for interpretation.
Why is Vitamin K tested in a Vitamins & Nutrients panel?
Vitamin K is tested in a Vitamins & Nutrients panel to show nutrient status in a broad lab review. The Vitamin K test helps describe whether the measured level fits the expected Vitamin K normal range and how it compares with other nutrient markers. On a lab report, it adds context to the overall pattern of blood values.
What does Vitamin K on a blood test mean?
Vitamin K on a blood test means the lab measured the amount of vitamin K in the sample and reported it as a number. The result is compared with the Vitamin K reference range to show whether it is low Vitamin K, normal Vitamin K, or high Vitamin K. The meaning can change with the lab method and recent intake.

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.

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