Immediately follow collection, mix sample by inverting 8 - 10 times to prevent clotting
Spin within two (2) hours of sample collection
Plasma separator (PST)
Immediately following collection, mix sample thoroughly by gentle inversion, 5 times
Gold serum separator (SST) tube
Refrigerated (preferred) - 1 month
Ambient - 7 days
Enzymatic
28 -100 U/L