Skip to content

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 supports bone health; low levels may indicate bleeding disorders or malabsorption issues."]

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

Key facts at a glance

LOINC
5125-0
Short code
CMV IgG Titr SerPl IF
Synonyms
CMV IgG Titr SerPl IF
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
Method
if
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 healthcare provider may order this test if you have symptoms like excessive bleeding, bruising, or if you’re at risk for bleeding disorders. It may also be checked before certain surgeries or if you have conditions like liver disease or intestinal disorders that affect vitamin K absorption.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw. Wear a comfortable shirt for easy access to your arm.

What Happens During the Test?

A healthcare professional will insert a small needle into your arm to draw blood. You may feel a slight pinch, but the process is quick. The blood is then sent to a lab for analysis.

What Are Possible Results?

Results are compared to a standard range, but exact values can vary by lab. Low levels may suggest vitamin K deficiency, while high levels might indicate liver disease or certain medications.

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.

◆Associated findings1

Short name

Vitamin K Level

Frequently asked questions

What causes low vitamin K levels?
Low vitamin K levels can result from poor diet (low intake of leafy greens or fortified foods), intestinal disorders (like Crohn’s disease), liver problems, or certain medications (e.g., antibiotics). Long-term use of blood thinners may also deplete vitamin K.
How is vitamin K deficiency treated?
Treatment often involves oral vitamin K supplements or injections, depending on severity. Lifestyle changes like eating vitamin K-rich foods (like kale, Brussels sprouts, or canola oil) may also help. Your provider will guide you on the best approach.
Can vitamin K levels be affected by medications?
Yes, some medications (like warfarin, antibiotics, or anticonvulsants) can lower vitamin K levels. Always inform your doctor about all medications you take, as they may interact with this test or your treatment plan.
  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