Test Details


X Clear

CA 15.3 (Breast Cancer Marker), Serum

Number of parameters covered 1


Quick View

Synonyms/Also Known as

Breast Cancer Tumor Marker

Related tests

CA 2729, CEA, Her2/neu, Estrogen/Progesterone Receptor Status, Gene Expression Tests for Breast Cancer

Why get tested?

To monitor the response to treatment and detect recurrence of invasive breast cancer.

When to get tested?

During treatment or post treatment of invasive breast cancer.

Sample required


Test preparation needed


About The Test

How is it used
The cancer antigen 15-3 (CA 15-3) test and CA 27.29 test are used to monitor treatment and detect recurrence of breast cancer. Additionally, clinical evaluations and tests like estrogen and progesterone receptors, Her2/neu, and gene expression tests are used. CA 15-3 is done to assess the tumor burden and used as a tumor marker in cases producing elevated amounts of CA 15-3. The CA 15-3 and CA 27.29 tests are not used as screening tests as they are not sensitive or specific enough.


1) What is CA 27.29?

CA 27.29 test measures the same protein as CA 15-3 and is used in the same way.

2) Is screening for CA 15-3 required in positive family history cases?

No, as it is not sensitive or specific enough.