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HelpTest Code CA19 Carbohydrate Antigen 19-9 (CA 19-9), Serum
Reporting Name
Carbohydrate Ag 19-9, SUseful For
As a potential adjunct for diagnosis and monitoring of pancreatic cancer
Potentially differentiating patients with cholangiocarcinoma and primary sclerosing cholangitis (PSC) from those with PSC alone
Method Name
Immunoenzymatic Assay
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumSpecimen Required
Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.6 mL
Collection Instructions:
1. Within 2 hours of collection, serum gel tubes should be centrifuged.
2. Within 2 hours of collection, red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial.
Specimen Minimum Volume
0.5 mL
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross Icterus | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 7 days | |
| Frozen | 90 days | ||
| Ambient | 8 hours |
Reference Values
<35 U/mL
Day(s) Performed
Monday through Saturday
CPT Code Information
86301
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CA19 | Carbohydrate Ag 19-9, S | 83084-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CA19 | Carbohydrate Ag 19-9, S | 83084-4 |
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.Report Available
1 to 3 daysForms
If not ordering electronically, complete, print, and send Oncology Test Request (T729)