Commercial Mail-out Laboratory
Patient should be fasting 12 hours or more before collection.
Pediatric patients draw before next feeding.
|Green top tube 4 mL (Na Heparin)
Lavender top tube 3 mL (EDTA)
Preferred Minimum: 0.5 mL sodium heparin plasma from a fasting
Absolute Minimum: 0.2 mL
Deliver to laboratory immediately after collection.
3 days upon receipt at reference laboratory
Negative (reported as positive or negative)
Quantitative results are provided when positive
Useful for diagnosis of 7-dehydrocholesterol reductase deficiency
(Smith-Lemli-Opitz syndrome). It is NOT used in the routine assessment
of nutritional lipid status. The enzymatic tests for measuring plasma
cholesterol quantitate all 3 hydroxysterols and are unreliable for
diagnosis for SLO.
Gas Chromatography-Mass Spectrometry (GC-MS)