Carcinoembryonic Antigen (CEA) in Aspirate Fluid by Mass Concentration

What Is Carcinoembryonic Antigen (CEA)?

CEA is a protein found in small amounts in healthy people but can rise in people with certain cancers, such as colorectal, pancreatic, or lung cancer. It can also appear in non-cancerous conditions like chronic inflammation or infection. This test helps doctors monitor cancer progression or response to treatment by measuring CEA levels in aspirate fluid, which may be collected during procedures like biopsies or drainage of fluid collections.

Why Might This Test Be Ordered?

Your doctor may order this test if you have a suspected or known cancer that produces CEA, or if you’re undergoing a procedure where fluid is aspirated (e.g., pleural effusion, ascites, or biopsy fluid). It may also be used to check for cancer spread or recurrence in certain cases.

What Does a High or Low Level Mean?

High levels of CEA in aspirate fluid may suggest the presence of cancer cells or abnormal growths in the area where fluid was collected. Low or normal levels do not definitively rule out cancer but may indicate fewer cancer cells or no active disease in that fluid sample.

How Is This Test Performed?

Fluid is collected via a medical aspiration procedure, such as draining fluid from a body cavity or biopsy site. The sample is then sent to a lab for analysis using mass spectrometry to measure CEA concentration.