LDLR Del/Dup Testing by MLPA

Omics test Model
Test Code D5237
Test Summary

This assay detects copy number changes in the LDLR gene, which is associated with familial hypercholesterolemia.
Turn Around Time 12 days
Acceptable Sample Types DNA, Isolated , Dried Blood Spots , Saliva , Whole Blood (EDTA)
Acceptable Billing Types Institutional Billing , Self (patient) Payment
NY Approved No
CPT Codes** 81405(x1)
*TAT starts after the sample and all required sample information is received at the processing laboratory.

**The CPT codes listed are in accordance with Current Procedural Terminology, a publication of the American Medical Association, and are provided for informational purposes only. CPT coding is the sole responsibility of the billing party.

This testing service has not been cleared or approved by the U.S. Food and Drug Administration. Testing services may not be licensed in accordance with the laws in all countries. The availability of specific test offerings is dependent upon laboratory location.
This test is not available in your region Japan, please select your nearest laboratory to request more information.
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Test Inquiry
Test Code: D5237
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Clinical Genomics Test Requisition Form

Test Description

Multiplex Ligation-Dependent Probe Amplification (MLPA) enables the detection of deletions and duplications of single and multiple exons within a given gene (PMID: 20938835). It is a semi-quantitative technique to determine relative copy numbers using a multiplex PCR-based reaction. Only hybridized and ligated adjacent probe oligonucleotides are amplified by PCR, thus specific for the sequence of interest. This test is a copy number analysis of the LDLR gene.

Condition Description

Familial hypercholesterolemia (FH) is an autosomal dominant disorder characterized by severely elevated low-density lipoprotein (LDL) cholesterol levels that cause atherosclerotic plaque deposition in arteries, which may lead to coronary artery disease (CAD) or other cardiovascular disease manifestations at an early age. Heterozygous FH has a worldwide prevalence of 1:200-250. Approximately 60-80% of FH is caused by pathogenic variants in the low-density lipoprotein receptor (LDLR) gene. The LDLR is a cell surface receptor that plays an important role in cholesterol homeostasis. The receptor binds and internalizes LDL cholesterol particles by endocytosis. The LDLR gene spans ~44.4 kilobases (kb) on chromosome 19p13.2 and contains 18 exons.

Genes

LDLR

Test Methods and Limitations

MLPA-based assay detecting deletions/duplications in the LDLR gene. The MRC-Holland reagent kits and the Applied Biosystem 3730xl DNA Analyzer instrument generate fragment analysis data.

Detailed Sample Requirements

Saliva
Test Details Page
Collection Container(s) Oragene™ Saliva Collection Kit or ORAcollect-Dx kit
Collection Collect saliva on an Oragene™ Saliva Collection Kit ORAcollect-Dx kit according to the manufacturer's instructions.
Sample Condition Store at ambient temperature. Do not refrigerate or freeze.
Shipping Ship overnight at ambient temperature.
Special Sample Instructions Please contact Revvity Omics to request the saliva collection kit for patients who cannot provide a blood sample as whole blood is the preferred sample. Testing using Saliva swabs is currently not available for customers in India. Contact the Revvity Omics laboratory for more information.
Dried Blood Spots
Test Details Page
Collection Container(s) Dried blood spot card
Collection

Follow kit instructions. Briefly, allow blood to saturate the card until indicated areas are filled and blood has soaked through the card. Air dry the card at ambient temperature for at least 3 hours.

  • NBS: Please contact Revvity Omics to request the StepOne® kit.
  • Gene Sequencing: Please contact Revvity Omics to request the DBS collection kit.
  • For pre-punched DBS: The required minimum is 6 punches
Sample Condition Follow the instructions provided with the collection set. Store the dried blood at ambient temperature for up to two days. If the specimen cannot be sent as soon as it is dry, the filter paper should be placed in a sealable plastic bag and stored in a refrigerator (≤ 8°C) or preferably in a freezer.
Shipping Follow kit instructions. Double bag and ship overnight at ambient temperature.
DNA, Isolated
Test Details Page
Collection

Required DNA Quantity by Test Type*:

  • Next Generation Sequencing (NGS): Send >1000 ng total gDNA @ >15 ng/μL. Please ship samples in 10mM Tris. Do not use EDTA.
  • Sanger Sequencing: Send >500 ng total gDNA @ >15 ng/μL (varies by the size of the gene and the variants requested).
  • Non-Sanger Sequencing Tests: Send >500 ng total gDNA @ >15 ng/μL.
Sample Condition * Required DNA Quality: High molecular weight DNA (>12kb). A260/A280 reading should be ≥ 1.8. A260/230 a ratio range of 1.8 to 2.2. Contact the laboratory for specific amounts if total ng cannot be met.
Shipping Ship overnight at ambient temperature.
Special Sample Instructions
  • Research Laboratories: DNA extracted in research laboratories is not acceptable. Only under exceptional circumstances (e.g., proband not available) will DNA extracted in a research laboratory be accepted for clinical testing. Additional testing (e.g., of other family members) may be required to confirm results.
  • Laboratories outside the United States: Non-US laboratories are not subject to CLIA regulations and will be reviewed on a case-by-case basis. Please call to speak with a laboratory genetic counselor before submitting a DNA sample from any non-CLIA-certified laboratory.
  • Special Notes: If extracted DNA is submitted, information regarding the method used for extraction should be sent along with the sample.
Whole Blood (EDTA) (Preferred Sample)
Test Details Page
Collection Container(s) EDTA (purple top)
Collection Infants (< 2-years): 2 to 3 mL; Children (>2-years): 3 to 5 mL; Older children and adults: Minimum 5mL. The blood tube should be inverted several times immediately after blood collection to prevent coagulation.
Sample Condition Store at ambient temperature. Do not refrigerate or freeze.
Shipping Ship overnight at ambient temperature ensuring receipt within 5-days of collection.
Special Sample Instructions Clotted or hemolyzed samples are not accepted.

Resources

Clinical Genomics Test Requisition Form