Monday - Friday, 0800 - 1700.
2 - 3 days.
0.5 mL (at least 1.0 mL preferred).
Centrifuge and separate from cells within 1 hour of drawing. Freeze serum or plasma.
Interpretive Reference Range:
Normal < 105 ng/mL.
Diagnosis and treatment of methylmalonic acidemias.
Stable isotope dilution gas chromatography-mass spectrometry (GC/MS).