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HelpTest ID NBLD0436 Arylsulfatase A, 24 Hour, Urine
Useful For
Detection of arylsulfatase A deficiency using urine specimens
This test is not suitable for carrier detection.
Specimen Type
UrineOrdering Guidance
The preferred test to rule-out metachromatic leukodystrophy is ARSAW / Arylsulfatase A, Leukocytes.
Shipping Instructions
Specimen must be received at least 1 day prior to assay day for processing.
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL tube
Specimen Volume: 6 mL
Collection Instructions:
1. Collect a 24-hour urine specimen.
2. No preservative.
3. Refrigerate specimen during collection.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Specimen Minimum Volume
2.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated | 14 days |
Day(s) Performed
Tuesday
Report Available
9 to 16 daysMethod Name
Colorimetric, Enzyme Assay
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84311
Reporting Name
Arylsulfatase A, UReference Values
≥19 nmol/h/mL
Note: 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 or carrier alleles. Patients with these depressed levels may be phenotypically normal.
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.Forms
1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:
-Informed Consent for Genetic Testing (T576)
-Informed Consent for Genetic Testing-Spanish (T826)
2. Biochemical Genetics Patient Information (T602)
3. If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Special Instructions
Testing Algorithm
See Lysosomal Storage Disorders Diagnostic Algorithm, Part 2
SANFORD LABORATORY INTERFACE BUILD INFORMATION
| Result Code | Result Code Description |
|---|---|
| 16051 | Arylsulfatase A, U |
| 19585 | Reviewed By |
| 19586 | Interpretation (ARSU) |