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Liquid chromatography tandem mass spectrometry (LC/MS-MS)
Serum (preferred) or plasma, frozen
Serum or plasma must be separated from cells within 45 minutes of venipuncture. Send serum or plasma in a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Freeze. Stable at room temperature or refrigerated for two days. Stable for 32 months frozen.