Test Overview
Test Methodology

Colorimetric Enzyme Assay

Test Usage

Detection of Metachromatic Leukodystrophy

Reference Range *

> or = 62 nmol/h/mg. Results from this assay may not reflect carrier status because of individual variation of arylsulfatase A enzyme levels. Low normal values may be due to the presence of pseudodeficiency gene or carrier gene. Patients with these depressed levels may be phenotypically normal.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Results from this assay may not reflect carrier status because of individual variation of arylsulfatase A enzyme levels.

Test Details
Days Set Up
Tuesday
Analytic Time

8 - 16 days

Soft Order Code
ARSW
MiChart Code
Arylsulfatase A, Leukocytes
Synonyms
  • ARS-A
  • Metachromatic Leukodystrophy
  • Mucolipidoses, Types II and III
Laboratory
Sendout
Reference Laboratory
Mayo ARSAW (8779)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect blood in an yellow top (ACD) solution A or B tube. Specimen must arrive within 24 hrs of collection. Refrigerate intact specimen; do not freeze. Draw Monday-Thursday only, and not the day before a holiday.

Special Handling

Collect specimens Monday - Thursday only, and not the day before a holiday; must arrive at performing lab within 96 hours of collection.

Normal Volume
6 mL ACD (solution A or B) whole blood
Minimum Volume
5 mL ACD (solution A or B) whole blood
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
82657
Fee Code
20073
NY State Approved
No