Quick Reference
- Full form
- CA 15-3
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Next day
- Available at
- All locations
About CA 15-3
CA 15-3 is a tumour marker mainly used to monitor breast cancer treatment response and watch for recurrence, rather than as a standalone screening test. It works best when tracked over time rather than judged from a single reading.
No fasting is required, and results are available the next day.
How to Prepare
- No fasting required.
- No special preparation needed before your blood draw.
Frequently Asked Questions
What is CA 15-3 testing used for?
It is mainly used to monitor breast cancer treatment response and watch for recurrence, tracked over time.
Do I need to fast before this test?
No fasting is required.
Is CA 15-3 used for cancer screening?
It is not typically used as a standalone screening test, since levels can rise for reasons unrelated to cancer.
Why is tracking this marker over time important?
A single reading is less useful than the trend over multiple tests, which helps show whether treatment is working.
How soon will my report be ready?
Next day.
Is home sample collection available?
Yes, in all City Care Lab service areas.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.