Monday - Friday, 0800 - 1700.
2 - 3 days.
0.5 mL (at least 1.0 mL preferred).
Centrifuge and separate from cells as soon as possible. Freeze immediately.
Interpretive Reference Range:
Normal < 3.0 mg/mL.
Elevated in Refsum disease and inherited disorders of peroxisomes.
Stable isotope dilution gas chromatography-mass spectrometry (GC/MS).