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Test Code 7 Dehydro 7 Dehydrocholesterol

Clinical System Name

7 Dehydrocholesterol


Cholesterol Biosynthesis Intermediates

Smith-Lemli-Opitz Syndrome

Sample Requirements

Specimen: Whole Blood

Container(s): Lavender/EDTA or Dark Green/Sodium Heparin

Preferred Vol: 3 mL

Minimum Vol: 2 mL


Processing Instructions

Reject due to:

Spin: Y

Aliquot: Y

Temp: -20 C

Storage Location: CPA -20 Freezer, Send Outs rack


Off-site collection: Centrifuge whole blood within 2 hours of collection and aliquot plasma. Freeze aliquot at -20 C. Transport sample, frozen, to Seattle Children's Main Lab.


Specimen Type Temperature Time
  Room temp N
  Refrigerated N
  Frozen Indefinitely



STAT Performed TAT
N T - F 3 - 5 d


Performing Laboratory

Kennedy Krieger Institute

Biochemical Genetics Section, Room 526

707 North Broadway

Baltimore, MD 21205


Phone: (443) 923-2782


Department: Send Outs

Phone Number: (206) 987-2563


Method: Stable Isotope Dilution Gas Chromatography - Mass Spectrometry (GC/MS)

Analytical Volume: 1 mL plasma


CPT Codes


Send Out Instructions

Reference Test Name 7-Dehydrocholesterol - Smith-Lemli-Opitz Syn.
Reference Test Code  
Instructions Ship on dry ice Monday through Thursday via FedEx Priority Overnight. Kennedy Krieger Institute does not accept Saturday deliveries.