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Test Code C2729 Breast Carcinoma-Associated Antigen, Serum

Secondary ID


Useful For

FDA-approved cancer-associated antigen (CA 27.29) for serial testing in women with prior stage II or III breast cancer who are clinically free of disease


Predicting early recurrence of disease in women with treated carcinoma of the breast


Indicating that additional tests or procedures should be performed to confirm recurrence of breast cancer


Measurement of CA 27.29 is not useful to screen women for carcinoma of the breast.

Method Name

Chemiluminometric Immunoassay

Reporting Name

Breast Carcinoma Assoc Ag(CA 27.29)

Specimen Type


Specimen Required

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection and aliquoted prior to sending (aliquot does not need to be within 2 hours).

2. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 90 days
  Refrigerated  7 days
  Ambient  4 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK

Reference Values


≥18 years: ≤38.0 U/mL (use not defined)


≥18 years: ≤38.0 U/mL

Reference values have not been established for patients who are <18 years of age.

Serum markers are not specific for malignancy, and values may vary by method.

Day(s) and Time(s) Performed

Monday through Friday; 6 a.m.-3 p.m.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. 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


LOINC Code Information

Test ID Test Order Name Order LOINC Value
C2729 Breast Carcinoma Assoc Ag(CA 27.29) 17842-6


Result ID Test Result Name Result LOINC Value
C2729 Breast Carcinoma Assoc Ag(CA 27.29) 17842-6


If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-General Request (T239)

-Oncology Test Request (T729)