Gold serum separator (SST) tube
Immediately following collection, mix sample by gently inverting 5 times.
Red serum vial/tube - 5 mL
Transfer vial/tube with cap - 12mL (LabCorp)
Refrigerated (preferred) - 14 days
Frozen - 60 days
Ambient - 7 days
Enzyme-linked immunosorbent assay (ELISA)
<20 units