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Test ID: ARSAW    
Arylsulfatase A, Leukocytes

NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Useful For Suggests clinical disorders or settings where the test may be helpful

Preferred test for detection of metachromatic leukodystrophy

Genetics Test Information Provides information that may help with selection of the correct test or proper submission of the test request

Preferred test to rule out metachromatic leukodystrophy. Not reliable in identifying carriers due to analytical variation and unusual genetic variants.


Metachromatic leukodystrophy (MLD) presents with progressive neurologic changes and leukodystrophy with variable age of onset


Arylsulfatase A enzyme levels are decreased in individuals with MLD, and excessive amounts of sulfatides are present in urine


Decreased arylsulfatase A enzyme levels can be seen in unaffected individuals who have a pseudodeficiency of arylsulfatase A

Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test

Method Name A short description of the method used to perform the test

Colorimetric Enzyme Assay

Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name

Arylsulfatase A, Leukocytes

Aliases Lists additional common names for a test, as an aid in searching

ARSA Deficiency
Arylsulfatase A Deficiency
Metachromatic Leukodystrophy
WBC Aryl Sulfatase A
Arylsulfatase A (WBC)