Carbohydrate Antigen (CA) 19-9 Blood Test

What is the purpose of this test?

The Carbohydrate Antigen (CA) 19-9 Blood Test measures the level of CA 19-9, a tumor marker that is often elevated in individuals with pancreatic cancer and other cancers of the digestive system. While CA 19-9 is not used to diagnose cancer on its own, it can help monitor the effectiveness of cancer treatments, detect recurrence, and provide additional information alongside other diagnostic tests. Elevated levels of CA 19-9 may also be linked to non-cancerous conditions such as pancreatitis, liver disease, and gallstones, making it an important test for assessing pancreatic and biliary health.

Healthcare providers often use this test to track changes in CA 19-9 levels over time, particularly in patients undergoing treatment for pancreatic cancer. A rising level may indicate disease progression, while a decreasing level may suggest a positive response to treatment. However, because some individuals do not produce CA 19-9, the test is most useful when combined with other clinical evaluations, imaging studies, and medical history.

Who should get this test?

The CA 19-9 Blood Test may be beneficial for individuals who:

• Have been diagnosed with pancreatic cancer and need to monitor treatment effectiveness.
• Are undergoing treatment for bile duct, colorectal, or liver cancer and require tumor marker tracking.
• Have a family history of pancreatic cancer and want additional screening tools.
• Experience persistent symptoms such as abdominal pain, jaundice, unexplained weight loss, or nausea, which may be linked to pancreatic or digestive tract diseases.
• Have chronic conditions like pancreatitis, liver disease, or gallstones that can cause elevated CA 19-9 levels.

When should I order the Carbohydrate Antigen (CA) 19-9 Blood Test?

Individuals may consider ordering this test if they have symptoms or concerns related to pancreatic or digestive tract health.

Symptoms to consider:

• Persistent abdominal pain or discomfort.
• Jaundice (yellowing of the skin or eyes).
• Unexplained weight loss or loss of appetite.
• Chronic nausea, vomiting, or digestive issues.
• A history of gallstones, pancreatitis, or liver disease with worsening symptoms.

If you have these symptoms or a condition known to cause elevated CA 19-9 levels, this test can help assess your health and assist your doctor in diagnosis and treatment decisions.