Immediatley following collection, mix sample by gently inverting 5 times
Gold serum separator (SST) tube
Refrigerated (preferred) - 7 days
Frozen - 14 days
Ambient - NO
Enzyme-linked immunosorbent assay (ELISA)
Negative: <6.0 U/mL
Weak positive: 6.0 - 9.0 U/mL
Strong positive: > 9.0 U/mL