Abbrevation: CA 15-3
Sector: Hormone 1
Transport: at 2-8˚c, -20˚c
Storage: 1 day at 2-8˚c for longer time at -20˚c
Test Name: Cancer Antigen 15 – 3 - Tumor Marker
Normal Range: -
To monitor the response to treatment of breast cancer and to watch for recurrence of the disease
When you have been or are being treated for breast cancer
A blood sample taken from a vein in your arm
Cancer antigen 15-3 (CA 15-3) is a normal product of breast cells. Concentrations of CA 15-3 in the blood are often increased in breast cancer. CA 15-3 does not cause cancer; rather, it is a protein that is shed by the tumour cells, making it useful as a marker to follow the course of the cancer.
CA 15-3 is rarely elevated in women with localised breast cancer but is increased in about 75% of those with breast cancer that has metastasised (spread to other organs). CA 15-3 also may be elevated in healthy people and in individuals with other cancers, or diseases, such as bowel cancer, lung cancer, cirrhosis, hepatitis, and benign breast disease.
How is the sample collected for testing?
A blood sample is obtained by inserting a needle into a vein in the arm.
Is any test preparation needed to ensure the quality of the sample?
No test preparation is needed.