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Serum or plasma concentration of vitamin G (likely vitamin K)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of vitamin K in your blood. Vitamin K is essential for blood clotting and bone health.

Quick summary

["Vitamin K helps your body form blood clots and maintain strong bones."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
22246-3
Short code
CMV IgG Titr SerPl
Synonyms
CMV IgG Titr SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
8
Ref high
61
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82977
SNOMED
3110003
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to check if you have a vitamin K deficiency, monitor vitamin K levels after treatment, or evaluate conditions that affect blood clotting or bone metabolism, such as liver disease or certain medications.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves drawing blood from a vein.

How the Test Is Performed

A healthcare provider will insert a needle into a vein in your arm to draw blood. You may feel a brief sting, but it usually doesn’t cause much discomfort.

Possible Risks and Side Effects

The most common side effect is a small bruise or slight pain at the injection site. Rarely, you might experience swelling or infection at the needle site.

Reference range

Adult males: 8-61 U/L; Adult females: 5-36 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Vitamin K plays a critical role in blood clotting and bone metabolism. Low levels may increase bleeding risk or affect bone health, while high levels can interfere with blood thinners like warfarin.

Short name

Vitamin K Level

Frequently asked questions

Will I need to avoid certain foods or drinks before the test?
If fasting is required, avoid caffeine, alcohol, or fatty foods for the specified period. Otherwise, eat and drink normally unless instructed otherwise.
How long will the results take to come back?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will discuss them with you.
Can vitamin K levels be affected by medications?
Yes, certain medications (like blood thinners or antibiotics) can alter vitamin K levels. Always inform your doctor about all medications you’re taking.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy