Carcinoembryonic Antigen (CEA), Pancreatic Cyst Fluid

Casandra

Casandra Test Code MC74039Version 1 (DRAFT)

Performing Lab

Lab Mayo Clinic LabLab Test ID CEAPCCPT Code 82378

Carcinoembryonic Antigen (CEA), Pancreatic Cyst Fluid

Clinical Use

Use

The Carcinoembryonic Antigen (CEA) test for pancreatic cyst fluid is useful in conjunction with imaging studies, cytology, and other tumor markers for distinguishing between mucinous and nonmucinous pancreatic cysts. It helps in determining the likely type of malignant pancreatic cyst. High concentrations of CEA in cyst fluid, particularly levels greater than or equal to 200 ng/mL, are very suggestive of mucinous cysts, which may carry a higher risk of malignancy. Although beneficial for assessing mucinous cyst potential, CEA testing alone does not reliably distinguish between benign, premalignant, or malignant mucinous cysts.

Special Instructions

This test should not be ordered for pancreatic fluid of non-cyst origin, such as pancreatic duct fluid or peripancreatic fluid, due to unestablished reference values for these specimen types. Ensure correlation of CEA test results with imaging studies, cytology, other cyst fluid tumor markers, and clinical findings for accurate diagnosis.

Limitations

CEA concentrations of 200 ng/mL and above are highly indicative of mucinous cysts, but this is not definitive for malignancy. The test cannot distinguish between malignant and nonmalignant mucinous cysts. False results may occur in rare cases where individuals develop antibodies to mouse or other animal antibodies (HAMA) which can interfere with the assay. CEA test results should be interpreted in conjunction with imaging studies, cytology, and other clinical findings. The test's sensitivity for mucinous lesions is approximately 62% and specificity is approximately 93% at the aforementioned concentration threshold.

Test Details

New York Approved