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Test Code OXYWB Oxysterols, Blood

Reporting Name

Oxysterols, B

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Investigation of possible diagnoses of Niemann-Pick disease types A, B, or C in blood spot specimens


Monitoring of individuals with NPC disease


This test is not suitable for the identification of carriers.

Method Name

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Specimen Required


Preferred: Lavender top (EDTA)

Acceptable: Green top (sodium heparin, lithium heparin) or yellow top (ACD B)

Specimen Volume: 1 mL

Specimen Type

Whole blood

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Refrigerated (preferred) 72 hours
  Ambient  48 hours

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

Reference Values


Cutoff: ≤0.800 nmol/mL



Cutoff: ≤0.100 nmol/mL


An elevation of cholestane-3-beta, 5-alpha, 6-beta-triol (COT) is highly suggestive of Niemann-Pick disease type C (NPC) disease.


An elevation of lyso-sphingomyelin (LSM) is highly suggestive of Niemann-Pick disease type A or B (NPA or NPB) disease.


An elevation of lyso-sphingomyelin 509 (LSM 509) is suggestive of NPA, NPB, or NPC disease.

Day(s) and Time(s) Performed

Tuesday; 8 a.m.; samples must be received in the lab by 4 p.m. the day before testing is performed to allow samples to be spotted on filter paper and dried.

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.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
OXYWB Oxysterols, B 92738-4


Result ID Test Result Name Result LOINC Value
BA4354 Interpretation (OXYWB) 59462-2
BA4352 Cholestane-3beta,5alpha,6beta-triol 92756-6
BA4353 Lyso-sphingomyelin 92748-3
BA4355 Reviewed By 18771-6


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