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Hereditary Congenital Myasthenic Syndrome Multigene Panel, Blood

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

A blood-based genetic test that examines multiple genes for variants associated with congenital myasthenic syndrome.

Quick summary

["This test looks for inherited DNA changes that may cause congenital myasthenic syndrome."]

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

Key facts at a glance

LOINC
103732-4
Short code
Hrd cong mya synd multi Bld/T
Synonyms
Hrd cong mya synd multi Bld/T
Category
liver
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 is this test?

This is a genetic blood test that analyzes multiple genes associated with congenital myasthenic syndrome, a group of inherited disorders affecting communication between nerves and muscles.

Why might I need this test?

It may be used when symptoms suggest a congenital neuromuscular disorder, especially with early-onset muscle weakness, fatigue, feeding difficulty, breathing problems, or a family history of similar symptoms.

How is the test performed?

A blood sample is collected, and DNA from the sample is analyzed for variants in selected genes associated with congenital myasthenic syndrome. The laboratory may report pathogenic, likely pathogenic, uncertain, or negative findings.

How do I prepare for the test?

No special preparation is usually needed. Tell your clinician if you have had a blood transfusion recently, because donor DNA may affect some genetic test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Congenital myasthenic syndrome genetic panel

Frequently asked questions

Does this test diagnose all types of congenital myasthenic syndrome?
No. It examines selected genes, so other genetic causes may not be included. A negative result does not rule out the condition.
Can the test help determine whether relatives are at risk?
Yes. If a disease-causing variant is identified, a genetics professional may discuss targeted testing for biological relatives.
How long does the test take?
Turnaround time varies by the laboratory and may be affected by testing complexity. The testing laboratory can provide an estimated result time.
  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