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Mass spectrometry (MS)
Serum (preferred) or plasma, frozen
1 mL (Note: This volume does not allow for repeat testing.)
Separate serum or plasma from cells within one hour of collection. Transfer to a plastic transport tube and freeze. To avoid delays in turnaround time when requesting multiple test on frozen samples, please submit separate frozen specimens for each test requested.
Freeze; stable for one year. Stable at room temperature for six days or refrigerated for 14 days.