This test looks for the antigen called cancer antigen 19-9 (CA 19-9) in your blood.
Antigens are substances that stimulate your body’s immune system. Some types of cancer cells send CA 19-9 into the blood, where it can be measured with this test.
A high amount of CA 19-9 is most often caused by pancreatic cancer. But it can also be caused by other types of cancer. And it can be caused by infections in your liver, gallbladder, and pancreas.
Antigens like CA 19-9 that give information about cancer are called tumour markers. This test is not used as a screening test for cancer.
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