Days Set Up
Daily, 24 hours
Analytic Time

4 hours

MiChart Code
CA 15-3 (Cancer Antigen 15-3)
Soft Order Code

Test Updated:


Breast Carcinoma Associated Antigen CA 15-3
CA 15-3
Cancer Antigen 15-3
Carbohydrate Antigen 15-3

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Test Overview

Test Methodology

Chemiluminescent Immunoassay (CLIA)

Test Usage

May be useful for predicting early recurrence of disease in women who have been treated for stage II or stage III carcinoma of the breast. This test should be used in conjunction with other clinical methods used for the early detection of recurrence. The test can aid in the management of breast cancer patients with metastatic disease by monitoring the progression or response to treatment. CA 15-3 can be elevated in patients with other malignancies such as lung cancer and other non-malignant disorders.

Reference Range

< 32 U/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in an SST or red top tube. Refrigerate and send intact specimen within 8 hours of collection. Alternatively, centrifuge, aliquot serum into a plastic vial and refrigerate up to 48 hours or freeze for longer storage.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.