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Test Code Billings Clinic: 8419 Mayo: CA19 Carbohydrate Antigen 19-9 (CA 19-9), Serum

Reporting Name

Carbohydrate Ag 19-9, S

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful 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


Specimen 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 Type

Serum

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  90 days
  Ambient  8 hours

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross Icterus OK

Reference Values

<35 U/mL

Interpretation

Serial monitoring of carbohydrate antigen 19-9 (CA 19-9) should begin prior to therapy to verify post therapy decreases in CA 19-9 and to establish a baseline for evaluating possible recurrence. Single values of CA 19-9 are less informative.

 

Elevated values may be caused by a variety of malignant and nonmalignant conditions including cholangiocarcinoma, pancreatic cancer, and colon cancer.

Day(s) Performed

Monday through Saturday

Report Available

1 to 3 days

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.

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

Forms

If not ordering electronically, complete, print, and send Oncology Test Request (T729)