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Genetic Mutation Analysis of Factor XII (F12) via Whole Blood Sample

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

This test checks for genetic changes in the Factor XII gene, which may influence blood clotting or bleeding risks. It’s often used in inherited bleeding disorders or genetic counseling.

Quick summary

["A genetic test to assess potential bleeding disorder risks linked to Factor XII mutations."]

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

Key facts at a glance

LOINC
58902-8
Short code
F12 gene Mut Tested Bld/T
Synonyms
F12 gene Mut Tested Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have a family history of unusual bleeding, clotting issues, or if you’re considering genetic testing for a suspected inherited disorder. It could also be part of a broader evaluation for bleeding disorders like hemophilia or other coagulation-related conditions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a small sample of whole blood drawn from your arm, similar to a regular blood draw. The sample is then analyzed in a lab to detect specific genetic mutations in the Factor XII gene.

What the Results Mean

Results may show normal genetic sequences, mutations associated with bleeding risks, or variants that require further evaluation. Your healthcare provider will discuss findings in the context of your medical history and symptoms.

Common Causes for Testing

This test is typically ordered when a doctor suspects an inherited bleeding disorder linked to Factor XII deficiencies or mutations. It may also be used in prenatal testing, carrier screening, or genetic counseling for families with a history of bleeding disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

F12 Gene Mutation Test

Frequently asked questions

How does Factor XII relate to blood clotting?
Factor XII is part of the intrinsic pathway of blood clotting. Mutations in this gene can lead to bleeding disorders, where blood doesn’t clot properly, or may rarely affect clotting mechanisms differently. Your doctor will interpret results alongside your symptoms and family history.
What if I have a positive mutation result?
A positive result means you may carry a mutation in the Factor XII gene. Your doctor will discuss next steps, which could include genetic counseling, monitoring for bleeding symptoms, or further testing to understand the impact of the mutation on your health.
Can this test be done on saliva instead of blood?
No, this test specifically requires a whole blood sample for genetic analysis. Saliva samples are not used for this particular test, as they may not provide sufficient DNA quality or quantity for accurate mutation detection.
  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