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Carboxylated Vitamin K-Dependent Carboxylase Activity (Serum)

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

This test measures how well your body converts vitamin K into its active form, which is important for blood clotting and bone health.

Quick summary

["Assesses vitamin K-dependent protein synthesis efficiency in your bloodstream."]

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

Key facts at a glance

LOINC
72808-9
Short code
JWH-018 carboxylated Ur Cfm-mCnc
Synonyms
JWH-018 carboxylated Ur Cfm-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
confirm
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like easy bruising, excessive bleeding, or unexplained bone pain. It could also be part of a broader evaluation for conditions affecting vitamin K metabolism, such as liver disease or certain blood disorders.

What to Expect Before the Test

No special preparation is typically needed. You may have a small needle inserted into your arm to draw a blood sample. If you’re on blood-thinning medications, let your provider know before the test.

What the Results Mean

Results help determine if vitamin K processing is functioning normally. Abnormal results may indicate issues with vitamin K absorption, liver function, or other metabolic pathways.

Common Conditions Monitored

This test can help diagnose or monitor conditions like vitamin K deficiency, certain liver diseases, or inherited disorders affecting blood clotting proteins.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Vitamin K Metabolism Test

Frequently asked questions

How long will it take to get my results back?
Results are usually available within 24 to 48 hours, depending on your lab. Follow up with your healthcare provider for interpretation.
What does a low result mean?
A low result may suggest problems with vitamin K processing, liver function, or malabsorption in the gut. Your provider will discuss next steps based on your overall health.
Can I eat or drink anything before this test?
You can eat and drink normally unless instructed otherwise. Avoid alcohol before testing, as it may affect blood chemistry.
  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