• Test Code:
    1645
  • Department:
  • Test Synonyms:
    TriglicerideHypertriglyceridemiaAPOA5APOC2GPIHBP1LMF1LPL
  • CPT Code(s):
    81479
Background:

Lipid disorders comprise a group of heterogenic conditions often with overlapping clinical features such as abnormal levels of HDL, LDL, or triglycerides. Hypertriglyceridemias are conditions which blood triglyceride concentrations are elevated. This next-generation sequencing test is designed to detect mutations in the coding regions of 5 genes associated with hypertriglyceridemias.

Reasons for Referral:

  • Abnormal levels of triglycerides.
  • Clinical presentation consistent with a lipid disorder.
  • Positive family history of Hypertriglyceridemia (targeted testing is available if familial mutation is known).
  • Carrier testing.

Methodology:

Next generation sequencing will analyze the exons or coding regions of 5 Hypertriglyceridemia - associated genes using Illumina NextSeq 500/550 technology. Samples are prepared using hybridization probes to enrich exonic regions.  This assay does not assess regions of insufficient coverage, introns and promoter regions; pseudogenes; where the reference genome is inaccurate or contains gaps and insertions; and regions of high GC or polynucleotide repeats, but may contain variants that impact gene function.

Exon-level deletion/duplication analysis is performed by running the NGS data through the Genome Analysis Toolkit (GATK) Germline Copy Number Variation best practices pipeline from GATK, version 4.1.4.1. A Bayesian model was validated clinically in our lab. The model can detect copy changes at a resolution of three (3) or more probe targets (exons) for deletions and duplications in genes that do not have pseudogenes, and is not designed to detect low-level mosaicism or balanced alterations.

Specimen Requirements:

 Blood: EDTA or ACD (Solution A or B):

  • Adult: 5 mL
  • Child: 5 mL
  • Infant: 2-3 mL

Saliva: 2 ORAgene™ Saliva Collection Kits (OGR-500) used according to manufacturer instructions.  Please contact KDL Client Services for a Saliva Collection Kit for patients that cannot provide a blood sample.
 
Assisted Saliva:
4 ORAgene™ Assisted Saliva Collection Kits (OGR-575) used according to manufacturer instructions.  Please contact KDL Client Services for an Assisted Saliva Collection Kit for patients that cannot provide a blood sample.

Skin Fibroblast:
Punch Biopsy (Cell cultures will be prepared at KDL and used for testing), or 2 T-25 confluent flasks.

DNA:
5-10µg at a minimum of 60-100ng/µL (DNA must be extracted in a CLIA-certified laboratory or a laboratory meeting equivalent requirements as determined by the CAP and/or CMS).

Prenatal:

  • Direct Amniotic Fluid (10-20mL)
  • Direct CVS
  • Direct POC
  • Cultured Amniocytes (2 T-25 flasks)
  • Cultured CVS (2 T-25 flasks)
  • Cultured Fetal Tissue: Product of Conception (2 T-25 flasks)
  • Cord Blood (1-2mL)

Notice Regarding Molecular Genetic Testing on CVS or Amniotic Fluid Specimens:

Maternal cell rule-out testing will be performed on all prenatal specimens received. Please provide maternal blood (or saliva) in addition to the fetal specimen. Additional charges apply for the maternal cell rule-out test.

For routine testing of blood and saliva (or DNA extracted from them), KDL does NOT accept samples from patients within two (2) weeks of a packed cell/platelet transfusion or within four (4) weeks of a whole blood transfusion.  For extraordinary circumstances, where testing must be performed outside of the above windows, please contact our lab.

A REQUISITION FORM MUST ACCOMPANY ALL SAMPLES.  Please include detailed clinical information, including ethnicity, clinical history, and family history.

Test Performed (Days):

Weekly

Turn Around Time:

6-8 weeks

Shipment Sensitivity Requirements:

  • Package and ship specimen to remain cold, but not frozen. 
  • Ship via overnight express, using the FedEx priority overnight label provided. 
  • Contact Client Services for shipping kits and instructions at (855) 535-1522.

References:

Additional Info:

The Knight Cancer Institute at Oregon Health & Science University is a pioneer in the field of precision cancer medicine. The institute's director, Brian Druker, M.D., helped prove it was possible to shut down just the cells that enable cancer to grow. This breakthrough has made once-fatal forms of the disease manageable and transformed how cancer is treated. The OHSU Knight Cancer Institute is the only National Cancer Institute-designated Cancer Center between Sacramento and Seattle – an honor earned only by the nation's top cancer centers. It is headquarters for one of the National Cancer Institute's largest research collaboratives, SWOG, in addition to offering the latest treatments and technologies as well as hundreds of research studies and clinical trials.

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