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Individual tumour markers for cancer screening.
The CA 19-9 Tumour Marker Test is a blood screening that measures the level of Cancer Antigen 19-9, a protein that can be elevated in certain types of cancers, particularly pancreatic cancer and other gastrointestinal malignancies. This test is primarily used to monitor treatment response in patients with known cancer, assess disease progression, and detect potential cancer recurrence. While CA 19-9 levels can be elevated in cancer, they may also be raised in certain benign conditions, making this test most valuable when used alongside other diagnostic tools and clinical assessments rather than as a standalone screening test for cancer detection.
Venous blood sample drawn
No fasting required
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A CA 19-9 blood test measures carbohydrate antigen 19-9, a tumour marker. Its main use is in monitoring: tracking how a level changes over time in someone already under specialist care. It is not designed to find cancer in people without a diagnosis.
CA 19-9 can also be raised in non-cancer conditions affecting the liver, bile ducts or pancreas. If you have symptoms such as yellowing skin, unexplained weight loss or persistent abdominal pain, see your GP promptly.
No. CA 19-9 is mainly used to monitor people already under specialist care. It can be raised in non-cancer conditions and can be normal when cancer is present.
No. It is not recommended for screening people without symptoms.
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Share it with the specialist or care team who follows your results. They will interpret it alongside your history, any treatment and any scan results.
Related single marker tests: CA 125 blood test · CEA blood test
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