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HelpTest Code LAB1877 MCAD Sequencing
Clinical System Name
MCAD (ACADM) Sequencing
Synonyms
ACADM
Fatty Acid Oxidation Disorder
Medium Chain Acyl-CoA Dehydrogenase Deficiency
Description
Medium-chain acyl-coA dehydrogenase (MCAD) deficiency is an inherited disorder of fatty acid metabolism caused by mutations in the MCAD gene.
Diagnosis is made using blood acylcarnitine profile, urine organic acids and DNA analysis.
Full gene sequencing - sequencing of all 12 exons and exon-intron boundaries of the ACADM gene.
Also available: Targeted Gene Variant Sequencing (LAB1915) - For targeted analysis of variants previously identified through clinical testing of a family member or research testing of the individual. Please review requirements and restrictions for testing.
Sample Requirements
Specimen: Whole blood, cord blood
Container(s): Lavender/EDTA, Yellow/ACD A or B
Preferred Vol: 3 mL
Minimum Vol: 1 mL
Note: Heparin samples (Green tops) are unacceptable.
Specimen: Extracted DNA from EDTA blood
Minimum: 10µg
Note: Isolation of nucleic acids for clinical testing must be performed in a CLIA-certified
laboratory or a laboratory meeting equivalent requirements as determined by the CAP
and/or the CMS. DNA concentration minimum 50 µg/mL; 260/280 ratio 1.70-2.00.
Specimen: Cultured cells
Acceptable: Fibroblasts
Container(s): T-25 flasks
Preferred Vol: 2 flasks
Specimen: Saliva collected using Oragene Dx OGD-575/675 collection kit.
Container: Oragene Dx OGD-575/675 collection kit
IMPORTANT NOTE: Manufacturer instructions must be followed. The Oragene Dx OGD575/675 kit is not for children under 6 months. Contact Lab Client Services for more information or to obtain a kit 206-987-2617, labclientservices@seattlechildrens.org
Processing Instructions
Reject due to: Heparin
Spin: No
Aliquot: No
Temp: Refrigerate
Storage location: Molecular Genetics box in CPA refrigerator #2
Off-site collection: Refrigerate blood samples until ready to ship. Transport all sample types at room temperature via overnight shipping.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Cultured cells | Room temp | 3 days |
| Whole blood, extracted DNA | Room temp | 3-5 days |
| Whole blood, extracted DNA | Refrigerated | 7 days |
| Extracted DNA | Frozen | ok |
| Saliva, ORAgene Dx OGD-575/675 | Room Temp | 2 weeks |
Note: Whole blood samples > 7days may be submitted to be assessed by our lab for acceptability for testing.
Availability
| STAT | Performed | TAT |
|---|---|---|
| Contact lab | Monday - Friday | 2-3 weeks |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Molecular Genetics Laboratory
Phone: 206-987-3872
Lab Client Services: 206-987-2617
Lab Genetic Counselor: LabGC@seattlechildrens.org
CPT Codes
| ACADM full gene seq | 81479 |
| ACADM targeted variant analysis | 81403 |
Methodology
Method: Bi-directional sequencing of all 12 exons and exon-intron boundaries of the MCAD gene.
Limitations: This test will identify >97% of sequence variants in the coding region and splice junctions. Mutations in the promoter region, large deletions, large duplications, or rare recombinant mutations may not be detected by this method.
Reference Range
Interpretive report will be provided
Requisition
Special Instructions
Links to: MCAD GeneReview
Clinical Utility
Medium-chain acyl-coA dehydrogenase (MCAD) deficiency is an inherited disorder of fatty acid metabolism caused by mutations in the MCAD gene. Individuals with MCAD are at risk for hypoglycemia during times of illness or prolonged fasting. Diagnosis is made using blood acylcarnitine profile, urine organic acids and mutation analysis. MCAD deficiency is estimated to affected 1/10 000 – 1/15 000 individuals and is included in the Washington State newborn screening program.