Lavender top (EDTA) tube must be at least half full. Smaller volumes can result in negative bias.
Place specimen on ice after collection and prior to processing.
Serum/plasma should be separated from cells within 6 hours of collection.
Note: Serum may clot more slowly and the volume of serum may be reduced as a result of being on ice.
Do not freeze/thaw specimens more than once.
Test is not affected by hemolysis or lipemia.
Note: Whole blood sample is stable for 6 hours on ice.