Description
Why It’s Done
1. Diagnose and Monitor Pancreatic Cancer
• Help support a diagnosis when combined with imaging and clinical evaluation.
• Monitor treatment effectiveness (e.g., chemotherapy or surgery).
• Detect recurrence of cancer after treatment.
2. Evaluate Other Gastrointestinal Cancers
• Especially cancers of the bile duct, gallbladder, stomach, or colon.
3. Assess Benign Conditions (With Caution)
• CA 19-9 may rise in:
o Chronic liver disease
o Cholangitis
o Pancreatitis
o Cystic fibrosis
These conditions can lead to elevated levels without cancer, so clinical context is essential.
Preparation
1. Fasting
• No fasting is required for this test.
• A standard blood sample is drawn from a vein in your arm.
2. Medications
• Inform your doctor about all medications, vitamins, and supplements you’re taking.
• Some liver or digestive conditions and medications may affect results, but no drugs need to be stopped unless instructed.
3. Other Considerations
• If you are undergoing treatment for cancer, your doctor may repeat the test over time to track changes in CA 19-9 levels.
• Not everyone can produce CA 19-9 (about 5–10% of people with a certain Lewis antigen-negative blood type), which can affect the reliability of the test.
