CA 19-9, Carbohydrate Ag 19-9

Cancer Antigen GI

Tube Type

Test ID LAB777
CPT Code(s) 86301
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station 30
Specimen Routine: 4 mL blood/serum separator tube/gold top/red top acceptable
Micro: 0.9 mL blood/gold or red top tube


8 hours


Room Temperature:  8 hours
Refrigerator:  2 days
Frozen:  1 month
Availability 24 hrs/daily
Turnaround Time Routine: 2 hours; STAT: 90 minutes
Reference Range Normal: ≤35 U/mL

Tumor marker assays cannot be used interchangeably; this test is performed using the Siemens Atellica IM CA19-9 Assay effective 7/13/21. See Memo #172

Heterophilic antibodies may cause interference.

Note: Patients genotypically negative for the Lewis blood group antigen will be unable to produce the CA 19-9 antigen even in the presence of malignant tissue.

Reviewed by Christopher Parker on December 28, 2021

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514