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Laboratory Test Directory

7-Dehydrocholesterol, Plasma

Components

Name Method Department Units
7 Dehydrocholesterol Gas Chromatography/Mass spectrometry
Send Out

Specimen Requirements

Plasma Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Sodium heparin), No Gel

3 mL 0.5 mL
Alternate

Green tube (Lithium heparin), No Gel

3 mL 0.5 mL
Alternate

Purple tube (EDTA)

3 mL 0.5 mL
Stability

Frozen - 90 day(s)
Refrigerated - 90 day(s)

Specimen Preparation

  • Centrifuge within 45 minutes, separate supernatant and freeze
  • Transport to laboratory as soon as possible

Reasons for Rejection

  • Collected in tube with gel separator
  • Wrong collection tube

Comments

This test is used for the Diagnosis of Smith-Lemli-Opitz syndrome (7-dehydrocholesterol reductase deficiency). Patient Prep: Fast for 12 hours or more, infants just before next feeding.

CPT Code

  • 82542