CA 19.9 Test (Cancer antigen 19.9)

CA 19.9 test is named from the first letters of  carbohydrate antigen or cancer antigen words. CA 19.9 test is used to detect pancreatic cancer and to monitor pancreatic cancer treatment. At the same time, an increased  CA 19.9 test result is used as a tumor marker for lung cancer, intestinal cancer and gallbladder cancer.

How the CA 19.9 test is done?

CA 19.9 test is a typical laboratory test and you’ll need to give a blood sample. Your nurse/technician/doctor will insert a needle in a vein usually inside of your elbow or on the back of your hand. He/she will draw blood into the test tube. This process takes 1-2 minutes at most. You may feel a little pain for a few seconds during the process.

Low Ca 19.9 test result

Low CA 19.9 test result is found in healthy people.

High CA 19.9 test result

CA 19.9 may be increased in pancreatic cancer and other cancer types and also in some other conditions different from cancer. A high CA 19.9 result may mean that pancreatic cancer treatment is not successful but for a correct evaluation and comparison, CA 19.9 level should be measured before the treatment. CA 19.9 test may be repeated and compared periodically to monitor the treatment. CA 19.9 is not enough itself to diagnose the cancer, test result must be evaluated with the patient’s physical examination, clinical condition and other tests and screening methods.

CA 19.9 test may be increased in cancer and other different conditions like;

  • Pancreatic cancerca-19-9
  • Hepatobiliary cancer
  • Gastric cancer
  • Colon cancer
  • Stomach cancer
  • Bile duct cancer
  • Liver cancer
  • Uterine cancer
  • Ovarian cancer
  • Breast cancer
  • Lung cancer

Non cancerous increasing

  • Cirrhosis
  • Hepatitis
  • Gallstones- biliary tract obstructions
  • Inflammatory bowel diseases
  • Cystic fibrosis
  • Pancreatitis

Evaluation of CA 19.9 test result

Tumor markers are not evaluated by standart methods so different results from different laboratories should not be compared with each other. For a correct monitoring and evaluation of patient, CA 19.9 test must be done in same laboratory everytime.


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