Huntingtin (HTT) gene CAG triplet repeat test
GTR Test Accession: Help GTR000078624.2
INHERITED DISEASENERVOUS SYSTEM
Last updated in GTR: 2013-11-25
Last annual review date for the lab: 2021-01-29 Past due LinkOut
At a Glance
Diagnosis; Mutation Confirmation; Pre-symptomatic; ...
Huntington disease
Genes (1): Help
HTT (4p16.3)
Molecular Genetics - Targeted variant analysis: Trinucleotide repeat by PCR or Southern Blot
Huntigton disease patients
Not provided
Establish or confirm diagnosis
Ordering Information
Offered by: Help
Test short name: Help
HD
Specimen Source: Help
Who can order: Help
  • Genetic Counselor
  • Health Care Provider
  • Licensed Physician
Test Order Code: Help
28-2
Contact Policy: Help
Laboratory can only accept contact from health care providers. Patients/families are encouraged to discuss genetic testing options with their health care provider.
How to Order: Help
Completion of the laboratory referral letter by the referring physician/scientist. Provision of a signed informed consent form. Both forms are available on the laboratory website.
Order URL
Test service: Help
Clinical Testing/Confirmation of Mutations Identified Previously
Test additional service: Help
Custom Prenatal Testing
Test development: Help
Test developed by laboratory (no manufacturer test name)
Informed consent required: Help
Yes
Pre-test genetic counseling required: Help
Yes
Post-test genetic counseling required: Help
Yes
Recommended fields not provided:
Conditions Help
Total conditions: 1
Condition/Phenotype Identifier
Test Targets
Genes Help
Total genes: 1
Gene Associated Condition Germline or Somatic Allele (Lab-provided) Variant in NCBI
Methodology
Total methods: 1
Method Category Help
Test method Help
Instrument
Targeted variant analysis
Trinucleotide repeat by PCR or Southern Blot
Applied Biosystems 3130xl genetic analyser
Clinical Information
Test purpose: Help
Diagnosis; Mutation Confirmation; Pre-symptomatic; Risk Assessment
Clinical utility: Help
Establish or confirm diagnosis
View citations (2)

Target population: Help
Huntigton disease patients
View citations (1)
  • A new polymerase chain reaction (PCR) assay for the trinucleotide repeat that is unstable and expanded on Huntington's disease chromosomes. Warner JP, et al. Mol Cell Probes. 1993;7(3):235-9. doi:10.1006/mcpr.1993.1034. PMID: 8366869.
Recommended fields not provided:
Technical Information
Test Procedure: Help
FAM labelled PCR and Applied Biosystems 3031xl automated fragment analysis of the CAG repeat expansion in exon 1 of the HTT (huntingtin) gene on chromosome 4p16.3. In most populations, normal HD alleles have <36 copies of the CAG repeat. Pathological alleles contain >35 CAG repeats. Alleles in the range between … View more
View citations (1)
  • A new polymerase chain reaction (PCR) assay for the trinucleotide repeat that is unstable and expanded on Huntington's disease chromosomes. Warner JP, et al. Mol Cell Probes. 1993;7(3):235-9. doi:10.1006/mcpr.1993.1034. PMID: 8366869.
Test Confirmation: Help
different method or new sample
Availability: Help
Tests performed
Entire test performed in-house
Analytical Validity: Help
99% precise
Proficiency testing (PT):
Is proficiency testing performed for this test? Help
Yes

Method used for proficiency testing: Help
Formal PT program

PT Provider: Help
European Molecular Genetics Quality Network, EMQN
Recommended fields not provided:
Regulatory Approval
FDA Review: Help
Category: Not Applicable
Additional Information

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