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Invitae Hereditary Transthyretin-mediated amyloidosis (hATTR amyloidosis) Test

Test code: 02265

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In addition to insurance and patient-pay billing options, this test is also available through a sponsored, no-charge testing program.

Test description

This test analyzes the TTR gene associated with familial transthyretin amyloidosis—the most common type of familial amyloid polyneuropathy.

Individuals with clinical symptoms of transthyretin amyloidosis may benefit from diagnostic genetic testing to better understand risks, confirm a diagnosis, or inform management. Asymptomatic individuals within a family with a known pathogenic variant may also benefit, as it may clarify their own personal risk of developing transthyretin amyloidosis or inform medical management.

Disorders tested

Ordering information

Turnaround time:

10–21 calendar days (14 days on average)

New York approved:

Yes

Preferred specimen:

3mL whole blood in a purple-top EDTA tube (K2EDTA or K3EDTA)

Alternate specimens:

Saliva, buccal swab, and gDNA are also accepted.
Learn more about specimen requirementsRequest a specimen collection kit

Clinical description and sensitivity

Clinical description:

Transthyretin amyloidosis is characterized by amyloidosis, the buildup of abnormal amyloid protein deposits in the body. Transthyretin amyloidosis can present with progressive axonal sensory autonomic and motor neuropathy and infiltrative cardiomyopathy. Additional features may include conduction block, nephropathy, vitreous opacities, or neurological symptoms related to CNS amyloidosis. Transthyretin amyloidosis can also be an acquired condition, due to age-related deposition of TTR, referred to as senile systemic amyloidosis.

Clinical description and sensitivity

Assay information

Invitae is a College of American Pathologists (CAP)-accredited and Clinical Laboratory Improvement Amendments (CLIA)-certified clinical diagnostic laboratory performing full-gene sequencing and deletion/duplication analysis using next-generation sequencing technology (NGS).

Our sequence analysis covers clinically important regions of each gene, including coding exons and 10 to 20 base pairs of adjacent intronic sequence on either side of the coding exons in the transcript listed below, depending on the specific gene or test. In addition, the analysis covers select non-coding variants. Any variants that fall outside these regions are not analyzed. Any limitations in the analysis of these genes will be listed on the report. Contact client services with any questions.

Based on validation study results, this assay achieves >99% analytical sensitivity and specificity for single nucleotide variants, insertions and deletions <15bp in length, and exon-level deletions and duplications. Invitae's methods also detect insertions and deletions larger than 15bp but smaller than a full exon but sensitivity for these may be marginally reduced. Invitae’s deletion/duplication analysis determines copy number at a single exon resolution at virtually all targeted exons. However, in rare situations, single-exon copy number events may not be analyzed due to inherent sequence properties or isolated reduction in data quality. Certain types of variants, such as structural rearrangements (e.g. inversions, gene conversion events, translocations, etc.) or variants embedded in sequence with complex architecture (e.g. short tandem repeats or segmental duplications), may not be detected. Additionally, it may not be possible to fully resolve certain details about variants, such as mosaicism, phasing, or mapping ambiguity. Unless explicitly guaranteed, sequence changes in the promoter, non-coding exons, and other non-coding regions are not covered by this assay. Please consult the test definition on our website for details regarding regions or types of variants that are covered or excluded for this test. This report reflects the analysis of an extracted genomic DNA sample. In very rare cases, (circulating hematolymphoid neoplasm, bone marrow transplant, recent blood transfusion) the analyzed DNA may not represent the patient's constitutional genome.

Assay information

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You can customize this test by clicking genes to remove them.

Primary panel

1 gene selected
TTR

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