1.0 mL Serum from a Red Top Tube in a Plastic Vial
2 days Ambient
1 week Refrigerated
1 month Frozen
Do not collect in a Serum Separator Tube (SST or PST)
Specimen should be drawn 11 to 17 hours after the last dose
Centrifuge and separate from cells immediately
0.5 mL
5-15 ng/mL
50 ng/mL or more
4 to 7 days
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