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Test ID FUCW Alpha-Fucosidase, Leukocytes

Useful For

Detection of fucosidosis


This test is not useful for establishing carrier status for fucosidosis.

Genetics Test Information

Fucosidosis is an autosomal recessive lysosomal storage disorder caused by reduced or absent alpha-L-fucosidase enzyme activity.


Determining enzymatic activity is the next step of the diagnostic workup for an individual clinically suspicious for an oligosaccharidosis and with a positive screening result suggestive of fucosidosis.

Method Name


Reporting Name

Alpha-Fucosidase, Leukocytes

Specimen Type

Whole Blood ACD

Advisory Information

If clinically suspicious of an oligosaccharidosis, a screening test is available. Order OLIGU / Oligosaccharide Screen, Random, Urine.

Shipping Instructions

For optimal isolation of leukocytes, it is recommended the specimen arrive refrigerate within 144 hours of collection to be stabilized. Collect specimen Monday through Thursday only and not the day before a holiday. Specimen should be Collected and packaged as close to shipping time as possible.

Specimen Required


Preferred: Yellow top (ACD solution B)

Acceptable: Yellow top (ACD solution A)

Specimen Volume: 6 mL

Collection Instructions: Send specimen in original tube. Do not transfer blood to other containers.

Specimen Minimum Volume

5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole Blood ACD Refrigerated (preferred) 6 days YELLOW TOP/ACD
  Ambient  4 days YELLOW TOP/ACD

Reference Values

≥0.32 nmol/min/mg protein

Day(s) and Time(s) Performed


Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FUCW Alpha-Fucosidase, Leukocytes 24047-3


Result ID Test Result Name Result LOINC Value
8814 Alpha-Fucosidase, Leukocytes 24047-3
35635 Interpretation (FUCW) 59462-2
35634 Reviewed By 18771-6

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

NY State Approved



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 in Special Instructions:

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing-Spanish (T826)

2. Biochemical Genetics Patient Information (T602) in Special Instructions

3. If not ordering electronically, complete, print, and send an Inborn Errors of Metabolism Test Request (T798) with the specimen.

Testing Algorithm

See Lysosomal Storage Disorders Diagnostic Algorithm, Part 1 in Special Instructions.