Cholesta-5,7-dien-3β-ol
14 days
Stable isotope dilution gas chromatography - mass spectrometry (GC/MS)
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Used in diagnosing Smith-Lemli-Opitz syndrome. Measures precursor in cholesterol biosynthesis.
Plasma
1 mL
Lavender-top (EDTA) tube or green-top (heparin) tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | Indefinitely |