Lab Test

Dehydrocholesterol, 7-

Smith-Lemli-Opitz syndrome, 7-Dehydrocholesterol , Kennedy Kreiger Institute #16, EPIC: LAB6494, SOFT: X7DHC

Specimen Collection Criteria

Collect: One Green-top Lithium or Sodium Heparin tube.
Also acceptable: One Lavender-top EDTA tube or 5.0 mL Amniotic Fluid in a sterile collection container.

Physician Office/Drawsite Specimen Preparation

  • Centrifuge to separate plasma from cells. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below).
  • Centrifuge Amniotic Fluid specimens and freeze (-20°C/-4°F or below) the supernatant prior to transport.

Preparation for Courier Transport

Transport: 0.5 mL plasma or amniotic fluid supernatant, frozen (-20°C/-4°F or below). (Min: 0.05 mL)

Rejection Criteria

  • Specimens not collected and processed as indicated.


Tuesday, Thursday, Friday.
Results available in 3-7 days.

Reference Range

By report.

Test Methodology

Gas Chromatography/Mass Spectrometry.

Clinical Utility

The 7-dehydrocholesterol test is ordered to rule out Smith-Lemli-Opitz syndrome.

CPT Code


Test Codes

Kennedy Kreiger Institute #16, EPIC: LAB6494, SOFT: X7DHC

Last Updated


Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.


This directory currently reflects information only for specimens collected and/or processed at the
Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.