Cancer Antigen 19-9 Mnemonic CA 19-9 Synonym CA-GI - CA 19-9 - CA 19.9 - Carbohydrate Antigen 19-9 Guidelines CA 19-19 is useful in monitoring pancreatic, hepatobiliary, gastric, hepatocellular and colorectal cancer. Specimen Collection Requirements Collect Serum, one 5.0 mL gold (SST) or 7.0 mL red top tube Supply Item Number - 101235 or 101192 Handling Allow serum tubes to clot completely at room temperature (minimum - SST: 30 minutes, red top tubes: 60 minutes). Centrifuge and separate serum from cells ASAP. Preferred Volume 1.0 mL Serum Minimum Volume 0.5 mL Serum (1.2 mL minimum whole blood draw) Transport Refrigerated (2-8°C). If the specimen will be delayed more than 24 hours, send frozen (≤ -20°C) Rejection Criteria Grossly hemolyzed or plasma specimens Specimens that have been thawed more than once Stability AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 48 hours; Frozen (≤ -20°C): 2 months. Do not thaw more than once. Testing Information Performed Mon, Wed, Fri Reported 24-72 hours Method Chemiluminescent Immunoassay Reference Values Reference Values All: 0-35 U/mL CPT Codes 86301 Blood Product Comment Results obtained with different assay methods or kits cannot be used interchangeably. The CA 19-9 assay value, regardless of level, should not be interpreted as absolute evidence of the presence or absence of malignant disease. Last Updated: Thursday, February 11, 2021 06:42:30 PM Client Services: 503-413-1234