CA 19-9 Test
A tumour marker blood test mainly used to monitor pancreatic cancer.
Quick Summary
To monitor pancreatic and bile duct cancers.
CA 19-9 level.
No preparation.
Overview
It isn't used for screening.
Jaundice and pancreatitis can raise it.
What It Measures
CA 19-9
Blood level.
How It's Performed
- 01
Preparation
Usually no special preparation unless your doctor advises.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm.
- 03
Afterwards
Press on the spot; a small bruise is common.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| CA 19-9 | Below 37 | U/mL |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories; use the range on your report. Your doctor will explain what your result means and what happens next.
If values are High:
Rising levels may suggest cancer activity.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- CA 19-9 Blood Test (Pancreatic Cancer)(opens in a new tab) · MedlinePlus, US National Library of Medicine