Tandem Mass Spectrometry
Serum or Plasma
UCSD Biochemical Genetics
2 mL Blood
Light Green (Lithium Heparin PST)
Plasma collected in sodium heparin (green-top) tube is also acceptable. Serum collected in a red-top or serum separator tube (SST) is also acceptable but only as an alternative if needed.
1 mL Plasma
0.5 mL Plasma
Centrifuge, separate serum or plasma within 20 minutes, and promptly freeze. Complete UCSD Biochemical Genetics requisition and submit with specimen frozen.
Carnitine total, free, and esterified.