CA15-3 is a tumor marker that may be ordered at intervals after treatment to help monitor a patient for breast cancer recurrence. It is not used as a screen for breast cancer but can be used to follow it in some patients once it has been diagnosed.
Use: Quantitative measurement of cancer antigen 15-3
Limitations: The CA 15-3 assay value, regardless of level, should not be interpreted as absolute evidence for the presence or absence of malignant disease. The CA 15-3 assay value should be used in conjunction with information available from clinical evaluation and diagnostic procedure.