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KCNQ1 Gene Mutation Detection (Blood)

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

This test checks for specific genetic changes in the KCNQ1 gene, which may be linked to certain heart rhythm disorders or long QT syndrome.

Quick summary

["A genetic test to identify mutations that could affect heart function."]

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

Key facts at a glance

LOINC
43746-7
Short code
KCNQ1 gene Mut Anl Bld/T
Synonyms
KCNQ1 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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have a family history of heart rhythm problems, unexplained fainting, or symptoms like palpitations. It could also be used if you’ve been diagnosed with a condition like long QT syndrome, which involves abnormal heart rhythms.

What to Expect Before the Test

No special preparation is needed. You’ll provide a small blood sample, usually drawn from your arm. The sample will be sent to a lab for genetic analysis.

What the Results Mean

Results can be positive (mutation detected), negative (no mutation found), or uncertain. A positive result means you have the genetic change, which may require further evaluation by a specialist.

Common Conditions Linked to This Test

KCNQ1 mutations are associated with long QT syndrome type 1 (LQTS1), a genetic disorder that can cause life-threatening heart rhythms. Early detection helps guide treatment and management strategies.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps identify inherited genetic changes that may increase your risk of heart rhythm disorders. If detected early, it can inform personalized medical advice, including monitoring, medications, or lifestyle adjustments to prevent complications.

Short name

KCNQ1 Mutation Test

Frequently asked questions

What does a positive result mean?
A positive result indicates you have a mutation in the KCNQ1 gene, which may contribute to conditions like long QT syndrome. Your doctor will discuss next steps, such as additional testing or heart monitoring, based on your symptoms and family history.
Currently, this test requires a blood sample for genetic analysis. Saliva tests are not standard for this specific mutation detection.
The frequency depends on your medical history and risk factors. Your healthcare provider will determine if retesting is needed, especially if you have symptoms or a family history of heart issues.
Is this test covered by insurance?
Coverage depends on your insurance plan and medical necessity. Check with your provider or insurance company to confirm if this test is included under your benefits.
  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