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Genetic mutation detection in leukocyte DNA (blood)

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

This test checks for specific genetic mutations present in white blood cells, which may be linked to inherited conditions or cancer risks.

Quick summary

["Identifying genetic mutations in your blood can help guide personalized healthcare decisions."]

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

Key facts at a glance

LOINC
21670-5
Short code
F7 gene Mut Anl Bld/T
Synonyms
F7 gene Mut Anl 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

What This Test Measures

The test analyzes DNA from white blood cells (leukocytes) to detect known mutations. These mutations may be associated with conditions like certain cancers, inherited disorders, or other genetic predispositions. The method used is typically next-generation sequencing or targeted mutation analysis.

Why It’s Done

Your healthcare provider may recommend this test if you have a family history of genetic disorders, symptoms suggestive of a genetic condition, or if you’re at higher risk for certain cancers. It can also be part of preconception or prenatal screening.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The white blood cells are isolated from the blood for genetic analysis. This process is standard for genetic testing and is done in a sterile lab environment.

What to Expect Before the Test

No special preparation is typically needed, though you may be asked to avoid certain medications or supplements that could interfere with results. Your doctor will provide specific instructions if applicable.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Genetic Mutation Screening in Blood

Frequently asked questions

What does a positive result mean?
A positive result indicates the presence of the specific mutation in your DNA. This finding may suggest an increased risk for certain conditions or guide further testing or monitoring. Your healthcare provider will discuss the implications based on the mutation detected.
Will this test show all possible genetic mutations?
No, this test only checks for the mutations specifically selected for analysis. It does not screen for all possible genetic variations in your DNA. Additional genetic testing may be needed if other mutations are suspected.
How long will it take to get results?
Results are typically available within 2 to 4 weeks, depending on the lab and complexity of the analysis. Your healthcare provider will contact you once results are ready.
  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