| Test code: | 6107 |
| Type of disorder: | Leukodystrophy |
| Disease(s) tested for: | Metachromatic Leukodystrophy |
| Genes Included: | ARSA, |
| Informed Consent Required: | This test requires physician attestation that patient consent has been received |
| Clinical Significance: | Detects mutations in the ARSA gene Typical Presentation: Late infantile MLD typically presents with weakness, hypotonia, clumsiness, toe walking and frequent falls. Juvenile MLD presentations include decline in school performance, behavioral problems, gait disturbances, and slurred speech. Adult MLD presents with problems in job performance, personality changes, substance abuse, emotional liability, and other neurological features such as weakness, spasticity, and neuropathy. |
| Methodology: | Sanger Sequencing |
| Reference Range: | No mutation detected |
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
| CPT: | 81405(1) |
Please label each specimen tube with two forms of patient identification. These forms of identification must also appear on the requisition form.
| Specimen Type: | Whole blood |
| Specimen Stability: | Room temperature: 10 days, Refrigerated: 10 days, Frozen: Unacceptable, |
| Specimen Requirements: | 8 mL (6 mL minimum) whole blood collected in two (lavender-top) EDTA tubes. Pediatric (0-3 years): 2 mL (1 mL minimum) |
| Instructions: | Higher blood volumes ensure adequate DNA quantity, which varies with WBC, specimen condition, and need for confirmatory testing. Patients, 0-3 years have higher WBC, yielding more DNA per mL of blood |
| Transport Temperature: | Room temperature |
| Set-up/Analytic Time: | 14-28 days |
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