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Factor VII Activity (Serum)

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

This test measures the activity level of Factor VII, a protein involved in blood clotting. It helps assess how well your blood can clot properly.

Quick summary

["Factor VII activity helps diagnose bleeding disorders and monitor treatment for clotting issues."]

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

Key facts at a glance

LOINC
21001-3
Short code
Fact VIII Spec-Imp
Synonyms
Fact VIII Spec-Imp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of bleeding problems, such as excessive bruising, prolonged bleeding from cuts, or unexplained nosebleeds. It may also be used in patients with liver disease, those on blood thinners, or those undergoing surgery to evaluate clotting function.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a few hours before the test, but always follow your provider’s instructions. Avoid taking blood-thinning medications (like warfarin or aspirin) unless directed otherwise, as they can affect results.

How the Test Is Performed

A blood sample is drawn from a vein, typically in your arm, using a needle. The blood is then processed to separate the serum for testing Factor VII activity levels.

What the Results Mean

Results are expressed as a percentage of normal activity. Low levels may indicate bleeding disorders or liver disease, while high levels could be due to certain medications or inherited conditions. Your provider will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Factor VII Activity

Frequently asked questions

How long does it take to get results?
Test results are typically available within 1–3 business days, depending on lab processing times and your healthcare provider’s workflow.
Can I eat or drink before this test?
Most labs recommend fasting for 8–12 hours before this test, but always confirm with your provider or the lab to avoid interfering with results.
Will I need to take any special precautions after the test?
You may experience mild bruising or soreness at the injection site. Apply ice if needed, and avoid heavy lifting for a day or two. Report any unusual bleeding or signs of infection (redness, swelling, fever) to your provider.
  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