Carbohydrate Antigen (CA) 19-9
Collect SST or red top, send 1.0 mL serum. After 30 minutes of clotting, promptly centrifuge and send. If using a red top, transfer serum to a screw top plastic tube, indicate sample type on tube and send.
Room temp: 14 days, Refrigerated: 14 days, Frozen: 14 days
Useful for monitoring gastrointestinal, pancreatic, liver, and colorectal malignancies.