Days Set Up
Analytic Time

8 - 16 days

MiChart Code
Arylsulfatase A, Leukocytes
Soft Order Code

Test Updated:


Metachromatic Leukodystrophy
Mucolipidoses, Types II and III

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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.

Specimen Requirements

Collection Onsite

Collect blood in 10 ml ACD yellow top tube (Solution A or B). Sample MUST arrive within 48 hours of collection. Draw Monday-Thursday only, and not the day before a holiday.

Collection Offsite

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.

Normal Volume
7 mL ACD (solution A or B) whole blood
Minimum Volume
5 mL ACD (solution A or B) whole blood

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.