Gold serum separator (SST) tube
Immediately following collection, thoroughly mix sample by gently inverting 5 times
Red serum vial/tube, 5 mL
False bottom plasma/serum transport vial/tube (AHL)
Refrigerated (preferred) - 6 months
Ambient - 3 days
Frozen - 1 year
Immunoturbidimetric
20.0 - 40.0 mg/dL