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Test ID ASMW Acid Sphingomyelinase, Leukocytes

Shipping Instructions

For optimal isolation of leukocytes, it is recommended the specimen arrive refrigerated within 6 days 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) or lavender top (EDTA)

Specimen Volume: 6 mL

Collection Instructions: Send specimen in original tube. Do not aliquot.


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.

Useful For

Investigation of possible diagnosis of Niemann-Pick disease types A and B


This test is not recommended for carrier detection because of the wide range of enzymatic activities observed in carriers and noncarriers.

Method Name

Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)

Reporting Name

Acid Sphingomyelinase, Leukocytes

Specimen Type

Whole Blood ACD

Specimen Minimum Volume

2 mL

Specimen Stability Information

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

Reference Values

≥0.32 nmol/hour/mg protein

An interpretative report will be provided.

Day(s) Performed

Preanalytical processing: Monday through Saturday.

Assay performed: Monday, Wednesday

Report Available

5 to 10 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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 US Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
ASMW Acid Sphingomyelinase, Leukocytes 24101-8


Result ID Test Result Name Result LOINC Value
606264 Acid Sphingomyelinase, Leukocytes 24101-8
606265 Interpretation 59462-2
606266 Reviewed By 18771-6