IMMUNOHISTOCHEMISTRY, CEA

What this test checks

Detects CEA protein in tissue sections to help identify adenocarcinomas (glandular cancers) and differentiate between different tumour types.

Why do people get this test?

CEA staining on tissue (different from the blood test) helps classify tumour types and determine their origin — important information for treatment planning.

When you should consider this test

• When classifying an adenocarcinoma of uncertain origin
• When differentiating between mesothelioma and adenocarcinoma
• As part of a tumour origin panel

How to prepare

No preparation needed — performed on biopsy or surgical tissue.