Oxysterols, Plasma




Test Mnemonic

OXSTRL

CPT Codes

  • 82542 - QTY (1)

Aliases

  • Acid Sphingomyelinase Deficiency
  • Niemann-Pick type A
  • Niemann-Pick type B
  • Niemann-Pick type C

Includes

  • Cholestane-3beta,5alpha,6beta-triol
  • 7-Ketocholesterol
  • Lyso-sphingomyelin
  • Interpretation
  • Reviewed By

Performing Laboratory

Mayo Clinic Dpt of Lab Med & Pathology

FDA Category

Laboratory Developed Test


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.3 mLPlasmaEDTA (Lavender)Place specimen on ice after draw.Frozen, CriticalChill specimen on ice and use refrigerated centrifuge (if possible) to separate plasma from cells. Without disturbing the buffy coat layer, transfer plasma to standard aliquot tube and freeze immediately. Separate specimens must be submitted when multiple tests are ordered.

Alternate Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.3 mLPlasmaSodium or Lithium heparin (Green)Place specimen on ice after draw.Frozen, CriticalChill specimen on ice and use refrigerated centrifuge (if possible) to separate plasma from cells. Without disturbing the buffy coat layer, transfer plasma to standard aliquot tube and freeze immediately. Separate specimens must be submitted when multiple tests are ordered.
0.3 mLPlasmaACD B (Yellow)Place specimen on ice after draw.Frozen, CriticalChill specimen on ice and use refrigerated centrifuge (if possible) to separate plasma from cells. Without disturbing the buffy coat layer, transfer plasma to standard aliquot tube and freeze immediately. Separate specimens must be submitted when multiple tests are ordered.

Stability

Environmental Condition Description
FrozenAfter separation from cells: 65 days
RefrigeratedUnacceptable
AmbientUnacceptable

Days Performed

Tue, Thu

Turnaround Time

4 - 8 days

Methodology

Name Description
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) 
Precipitation 

Reference Range

7-Ketocholesterol
Sex Age From Age To Type Range Range Unit
       Cutoff:  
Cholestane-3beta-5alpha,6beta-triol
Sex Age From Age To Type Range Range Unit
       Cutoff:  
Lyso-sphingomyelin
Sex Age From Age To Type Range Range Unit
       Cutoff:  

Special Info

Chill specimen on ice and use refrigerated centrifuge (if possible) to separate plasma from cells. Without disturbing the buffy coat layer, transfer plasma to standard aliquot tube and freeze immediately. Separate specimens must be submitted when multiple tests are ordered. This test is New York State approved.

Clinical Info

This test is useful for investigating a possible diagnosis of Niemann-Pick disease types A, B, or C using plasma specimens. It is also useful for monitoring individuals with Niemann-Pick type C disease. An elevation of cholestane-3-beta, 5-alpha, 6-beta-triol is highly suggestive of Niemann-Pick disease type C (NPC). An elevation of lyso-sphingomyelin (LSM) is highly suggestive of Niemann-Pick type A or B (NPA or NPB) disease. An elevation of LSM 509 is suggestive of NPA, NPB, or NPC disease.

Clinical Limitation

This test is not useful for the identification of carriers. Nonspecific neonatal cholestasis may result in elevations of cholestane-3-beta, 5-alpha, 6-beta-triol and lyso-sphingomyelin 509.