GTR Test Accession:
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GTR000568354.4
CAP
Last updated in GTR: 2022-08-01
View version history
GTR000568354.4, last updated: 2022-08-01
GTR000568354.3, last updated: 2022-07-28
GTR000568354.2, last updated: 2020-08-06
GTR000568354.1, last updated: 2019-08-14
Last annual review date for the lab: 2023-07-28
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At a Glance
Test purpose:
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Diagnosis;
Mutation Confirmation
Conditions (1):
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Spinal muscular atrophy
Genes (1):
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SMN1 (5q13.2)
Methods (1):
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Molecular Genetics - Deletion/duplication analysis: Multiplex Ligation-dependent Probe Amplification (MLPA)
Target population: Help
Not provided
Clinical validity:
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Approximately 60–70% of patients with SMA have the type I …
Clinical utility:
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Establish or confirm diagnosis
Ordering Information
Offered by:
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Test short name:
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SMN1
Specimen Source:
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- Peripheral (whole) blood
- View specimen requirements
Who can order: Help
- Licensed Physician
Test Order Code:
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2512
Lab contact:
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Contact Policy:
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Laboratory can only accept contact from health care providers. Patients/families are encouraged to discuss genetic testing options with their health care provider.
Test service:
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Clinical Testing/Confirmation of Mutations Identified Previously
Informed consent required:
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Decline to answer
Pre-test genetic counseling required:
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Decline to answer
Post-test genetic counseling required:
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Decline to answer
Recommended fields not provided:
How to Order,
Test strategy,
Test development
Conditions
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Total conditions: 1
Condition/Phenotype | Identifier |
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Test Targets
Genes
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Total genes: 1
Gene | Associated Condition | Germline or Somatic | Allele (Lab-provided) | Variant in NCBI |
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Methodology
Total methods: 1
Method Category
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Test method
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Instrument *
Deletion/duplication analysis
Multiplex Ligation-dependent Probe Amplification (MLPA)
* Instrument: Not provided
Clinical Information
Test purpose:
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Diagnosis;
Mutation Confirmation
Clinical validity:
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Approximately 60–70% of patients with SMA have the type I disease. Homozygous variants of the SMN1 gene cause SMA. Both copies of the SMN1 gene are absent in approximately 95% of affected patients. The remaining 5% of patients have nonsense, frameshift, or missense variants within the gene (not detected in …
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View citations (1)
- Technical standards and guidelines for spinal muscular atrophy testing. Prior TW, et al. Genet Med. 2011;13(7):686-94. doi:10.1097/GIM.0b013e318220d523. PMID: 21673580.
Clinical utility:
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Establish or confirm diagnosis
View citations (1)
- Technical standards and guidelines for spinal muscular atrophy testing. Prior TW, et al. Genet Med. 2011;13(7):686-94. doi:10.1097/GIM.0b013e318220d523. PMID: 21673580.
Variant Interpretation:
Are family members with defined clinical status recruited to assess significance of VUS without charge?
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Decline to answer.
Decline to answer.
Will the lab re-contact the ordering physician if variant interpretation changes?
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Decline to answer.
Decline to answer.
Recommended fields not provided:
Target population,
What is the protocol for interpreting a variation as a VUS?,
Is research allowed on the sample after clinical testing is complete?,
Sample negative report,
Sample positive report
Technical Information
Availability:
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Tests performed
Entire test performed in-house
Entire test performed in-house
Analytical Validity:
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For validation, samples from seven patients with clinical diagnosis of SMA (known genotype) and six samples from the CAP of 2013 were analyzed using SALSA MLPA P460 SMA probemix kit. 100% of concordancy was obtained.
Proficiency testing (PT):
Is proficiency testing performed for this test?
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Yes
Method used for proficiency testing: Help
Formal PT program
PT Provider: Help
American College of Medical Genetics / College of American Pathologists, ACMG/CAP
Yes
Method used for proficiency testing: Help
Formal PT program
PT Provider: Help
American College of Medical Genetics / College of American Pathologists, ACMG/CAP
Recommended fields not provided:
Test Confirmation,
Assay limitations,
Description of internal test validation method,
Citations for Analytical validity,
Description of PT method,
Major CAP category, CAP category, CAP test list
Regulatory Approval
FDA Review:
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Not provided
Additional Information
Clinical resources:
Practice guidelines:
Consumer resources:
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with specific questions about a genetic test should contact a health care provider or a genetics professional.