Primary Carnitine Deficiency, Systemic: SLC22A5 Sequencing

SLC22A5 sequencing is a molecular test used to identify variants in the gene associated with Primary Carnitine Deficiency, systemic.

Turnaround Time

2 weeks

CPT Code(s)

81405

Cost

$1,000.00

Genes

Primary carnitine deficiency is an autosomal recessive disorder resulting from impaired carnitine transport and primarily affects skeletal and cardiac muscle. Muscle weakness and hypertrophic cardiomyopathy are common manifestations. Patients may also present with an acute illness or have recurring episodes of illness which can include hypoglycemia and lethargy as well as hepatic and renal dysfunction. Individuals with mutations in SLC22A5 will usually have biochemical findings of low plasma carnitine and elevated urine carnitine. Systemic primary carnitine deficiency is effectively treated with dietary supplementation of carnitine.

Molecular testing is useful to confirm the diagnosis and to identify the disease causing mutations within a family to allow for carrier testing and prenatal diagnosis.

Sanger Sequencing

The preferred sample type is 3-5 ml of peripheral blood collected in an EDTA (purple top) tube. Extracted DNA, dried blood spots, and saliva are also accepted for this test. Saliva samples must be submitted in an approved saliva kit. Contact the lab to receive a saliva kit or to have one sent to your patient.

The specimen should be kept at room temperature and delivered via overnight shipping. If shipment is delayed by one or two days, the specimen should be refrigerated and shipped at room temperature. Do not freeze the specimen. Samples collected on Friday can be safely designated for Monday delivery.

Prenatal diagnosis is available if the familial mutations are known. Additional fees for cell culture and maternal cell contamination may apply. Maternal cell contamination studies are required for all prenatal molecular tests. Contact the laboratory prior to sending a prenatal specimen.