Available Stat

No

Performing Lab

Medical Genomics - Molecular Diagnostics

Performed

Run once per 1-2 weeks or as needed

Methodology

PCR and capillary electrophoresis. Reflex to genomic Southern blot, if homozygosity is detected by PCR.

Reported

10-14 days

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.

Reflex Testing

An interpretation of this test by a laboratory physician will automatically be performed and billed for separately.

Synonyms

  • Huntington chorea
  • HTT

Sample Type

EDTA, citrated or ACD whole blood

Collect

Lavender top preferred, Blue top and Yellow (ACD) tops acceptable

Amount to Collect

3 mL blood

Preferred Volume

3 mL blood

Remarks

All patients must receive genetic counseling prior to pre-symptomatic Huntingtons testing. The name of the genetic counselor who provided counseling must be included on the test requisition.

If collecting in citrate, check the expiration date on the label of the blue top vacutainer before drawing the patient.

Do not collect sample in heparin. Keep sample refrigerated for overnight or longer storage.

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.

Test Code

HUNT

Performing Lab

Medical Genomics - Molecular Diagnostics

Specimen Preparation

Do not centrifuge the specimen. Store at room temperature. Refrigerated samples are acceptable.

Preferred Volume

3 mL blood

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.

Reference Interval

Normal, CAG repeat sizes less than 27.

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Codes

81271, 81274

LDT or Modified FDA

Yes

LOINC Codes

53782-9

Available Stat

No

Test Code

HUNT

Performing Lab

Medical Genomics - Molecular Diagnostics

Performed

Run once per 1-2 weeks or as needed

Methodology

PCR and capillary electrophoresis. Reflex to genomic Southern blot, if homozygosity is detected by PCR.

Remarks

All patients must receive genetic counseling prior to pre-symptomatic Huntingtons testing. The name of the genetic counselor who provided counseling must be included on the test requisition.

If collecting in citrate, check the expiration date on the label of the blue top vacutainer before drawing the patient.

Do not collect sample in heparin. Keep sample refrigerated for overnight or longer storage.

Collect

Lavender top preferred, Blue top and Yellow (ACD) tops acceptable

Amount to Collect

3 mL blood

Sample Type

EDTA, citrated or ACD whole blood

Preferred Volume

3 mL blood

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.

Specimen Preparation

Do not centrifuge the specimen. Store at room temperature. Refrigerated samples are acceptable.

Reference Interval

Normal, CAG repeat sizes less than 27.

Synonyms

  • Huntington chorea
  • HTT

Reported

10-14 days

Reflex Testing

An interpretation of this test by a laboratory physician will automatically be performed and billed for separately.

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Codes

81271, 81274

LDT or Modified FDA

Yes

LOINC Codes

53782-9
Ordering

Available Stat

No

Performing Lab

Medical Genomics - Molecular Diagnostics

Performed

Run once per 1-2 weeks or as needed

Methodology

PCR and capillary electrophoresis. Reflex to genomic Southern blot, if homozygosity is detected by PCR.

Reported

10-14 days

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.

Reflex Testing

An interpretation of this test by a laboratory physician will automatically be performed and billed for separately.

Synonyms

  • Huntington chorea
  • HTT
Collection

Sample Type

EDTA, citrated or ACD whole blood

Collect

Lavender top preferred, Blue top and Yellow (ACD) tops acceptable

Amount to Collect

3 mL blood

Preferred Volume

3 mL blood

Remarks

All patients must receive genetic counseling prior to pre-symptomatic Huntingtons testing. The name of the genetic counselor who provided counseling must be included on the test requisition.

If collecting in citrate, check the expiration date on the label of the blue top vacutainer before drawing the patient.

Do not collect sample in heparin. Keep sample refrigerated for overnight or longer storage.

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.
Processing

Test Code

HUNT

Performing Lab

Medical Genomics - Molecular Diagnostics

Specimen Preparation

Do not centrifuge the specimen. Store at room temperature. Refrigerated samples are acceptable.

Preferred Volume

3 mL blood

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.
Result Interpretation

Reference Interval

Normal, CAG repeat sizes less than 27.

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.
Administrative

CPT Codes

81271, 81274

LDT or Modified FDA

Yes

LOINC Codes

53782-9
Complete View

Available Stat

No

Test Code

HUNT

Performing Lab

Medical Genomics - Molecular Diagnostics

Performed

Run once per 1-2 weeks or as needed

Methodology

PCR and capillary electrophoresis. Reflex to genomic Southern blot, if homozygosity is detected by PCR.

Remarks

All patients must receive genetic counseling prior to pre-symptomatic Huntingtons testing. The name of the genetic counselor who provided counseling must be included on the test requisition.

If collecting in citrate, check the expiration date on the label of the blue top vacutainer before drawing the patient.

Do not collect sample in heparin. Keep sample refrigerated for overnight or longer storage.

Collect

Lavender top preferred, Blue top and Yellow (ACD) tops acceptable

Amount to Collect

3 mL blood

Sample Type

EDTA, citrated or ACD whole blood

Preferred Volume

3 mL blood

Unacceptable Conditions

Inadequate sample. Samples collected in heparin.

Specimen Preparation

Do not centrifuge the specimen. Store at room temperature. Refrigerated samples are acceptable.

Reference Interval

Normal, CAG repeat sizes less than 27.

Synonyms

  • Huntington chorea
  • HTT

Reported

10-14 days

Reflex Testing

An interpretation of this test by a laboratory physician will automatically be performed and billed for separately.

Additional Information

The results for this test will not be available in APEX to safeguard patient confidentiality. All Huntington's results are referred to Genetic Counselor Jamie C. Fong and must be obtained from her at (415) 476-8613.

Results are reported as in the Table below following recommendations from the American College of Medical Genetics and Genomics (Bean L, Bayrak-Toydemir P. Genet. Med 16:1-7, 2014, PMID: 25356969).
CAG repeat size Interpretation
Less than 27 Normal allele
27 - 35 Normal mutable allele
36 - 39 HD allele with reduced penetrance
> 39 HD allele with full penetrance


This test was developed and its performance characteristics determined by the Clinical Laboratories at the Medical Center at UC San Francisco. It has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Codes

81271, 81274

LDT or Modified FDA

Yes

LOINC Codes

53782-9

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