IHC Marker - CEA (Polyclonal) Test
About IHC Marker - CEA (Polyclonal) Test
| Field | Value |
|---|---|
| Also Known As | IHC-CEA, Carcinoembryonic Antigen Immunohistochemistry, CEA Immunostain, CD66e IHC |
| Sample Type | Tissue (formalin-fixed, paraffin-embedded block) |
| Fasting Required | No |
| Report Time | 3 days |
| Recommended For | Adults of all ages with suspected or confirmed cancers, particularly adenocarcinomas |
| Price | Starting at ₹1,920 |
What is an IHC Marker - CEA (Polyclonal) Test?
The IHC Marker - CEA test is a specialised laboratory test that detects the presence of carcinoembryonic antigen (CEA), a protein, in tumour tissue. It is performed using a technique called immunohistochemistry (IHC), where antibodies are applied to a tissue section to identify specific proteins within cells. Doctors order this test to help classify tumours, identify their origin, and distinguish between different types of cancer. It is also known as CEA Immunostain or IHC-CEA.
What Does an IHC Marker - CEA (Polyclonal) Test Measure?
The IHC Marker - CEA (Polyclonal) test analyses tissue for CEA expression using a polyclonal antibody, which recognises multiple binding sites on the CEA molecule. This offers broader detection across tumour types. The table below summarises what the test reports:
| Component | What It Tells You |
|---|---|
| CEA Expression | Whether CEA protein is present or absent in the tissue |
| Staining Intensity | Reported as weak, moderate, or strong if positive |
| Staining Pattern | Whether staining is membranous (on cell surface) or cytoplasmic (inside the cell) |
Why is an IHC Marker - CEA (Polyclonal) Test Done?
This test is requested by pathologists and oncologists when tissue from a biopsy or surgical procedure needs to be examined for tumour classification or origin. It plays a key role in distinguishing between different cancer types.
Common Symptoms That May Require This Test
A doctor may order this test after a biopsy is taken from a patient presenting with one or more of the following symptoms:
- Unexplained weight loss
- Persistent abdominal pain
- Changes in bowel habits
- Rectal bleeding
- Persistent cough
- Difficulty swallowing
- A palpable lump or mass
Conditions This Test Can Help Detect
The IHC-CEA test helps identify or differentiate several cancers and tumour types. These include:
- Colorectal cancer and other gastrointestinal tumours
- Cancers of the pancreas, stomach, breast, and lungs
- Pulmonary adenocarcinoma (a type of lung cancer arising from glandular cells)
- Medullary thyroid carcinoma
- Distinguishing mesothelioma (cancer of the lung lining) from adenocarcinoma, as mesotheliomas are typically CEA-negative
- Identifying hepatocellular carcinoma (primary liver cancer) through a characteristic bile canalicular staining pattern seen with polyclonal CEA
IHC Marker - CEA (Polyclonal) Test for Chronic Disease Monitoring
Once a cancer diagnosis is established, this test may be repeated on new biopsy material during the course of treatment. Changes in CEA expression in tissue can help a doctor assess whether the treatment is producing the expected effect or whether the disease is progressing.
How to Prepare and What to Expect
No special preparation is needed from the patient for this test, as it is performed entirely on a tissue sample that has already been collected. Below is what to expect throughout the process.
Do You Need to Fast?
No fasting is required. This test is carried out on a tissue block in the laboratory and does not involve a fresh blood or urine collection from the patient.
Practical Tips Before Your Test
There are a few important steps to take before submitting the tissue block for testing:
- Bring a detailed clinical history, including your symptoms, previous test results, and family history, as this is required for the test.
- Ensure all previous histopathology (tissue examination) reports are available and handed to the referring doctor.
- Provide any relevant radiology or imaging reports alongside the tissue block.
- Confirm with your doctor that the correct tissue block from the biopsy or surgery is being submitted.
Step-by-Step Procedure
The IHC Marker - CEA test procedure is carried out entirely within the laboratory on tissue that was collected during an earlier biopsy or surgical procedure. Here is how the process works:
- A surgeon or pathologist collects a tissue sample during a biopsy or surgical operation. This step happens before the IHC test is requested.
- The tissue is treated with formalin to preserve it, then embedded in paraffin wax to form a solid block. This is called an FFPE (formalin-fixed, paraffin-embedded) tissue block.
- The laboratory cuts the block into very thin sections and places them on glass slides. The paraffin is removed, and the tissue is rehydrated. A step called antigen retrieval is performed to expose the protein of interest.
- Slides are treated with the polyclonal CEA antibody, which binds to any CEA protein present in the cells.
- A dye is applied so that areas where the antibody has bound become visible under a microscope.
- A qualified pathologist examines the stained slides and records the result, including whether staining is present, its intensity, and its location within the cells.
Factors That Can Affect Accuracy
Several factors in the tissue collection and processing stages can influence the quality of the result:
- Duration and quality of formalin fixation of the tissue
- Delay between tissue collection and fixation
- Technique used for antigen retrieval in the laboratory
- Concentration of the antibody applied
- Experience and expertise of the pathologist reading the slides
- Cross-reactions that can occur with polyclonal antibodies, which may affect staining specificity
Understanding Your IHC Marker - CEA (Polyclonal) Test Results
Results from this test are always reviewed by a pathologist and interpreted alongside the clinical picture, imaging findings, and other laboratory data. The table below provides a general guide to result interpretation:
| Result | Interpretation |
|---|---|
| Negative | No CEA protein detected in the tissue |
| Positive (Weak) | Low-level CEA expression present |
| Positive (Moderate) | Moderate CEA expression present |
| Positive (Strong) | High-level CEA expression present |
| Bile canalicular pattern | Characteristic of hepatocellular carcinoma |
A positive result may suggest the presence of certain cancers, particularly colorectal cancer, pulmonary adenocarcinoma, or other adenocarcinomas. CEA-positive staining in a lung tumour, for instance, favours adenocarcinoma over mesothelioma, which is usually CEA-negative.
A negative result does not definitively rule out cancer. The result must always be read in context.
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain conditions and factors can affect how results are read.
Non-cancerous conditions, including liver disease, inflammatory bowel disease, and some lung conditions, may cause elevated CEA expression. Smoking is also known to raise CEA levels. These factors must be considered when interpreting a positive result.
Polyclonal antibodies can occasionally produce cross-reactions with proteins other than CEA, which may affect the specificity of staining. The pathologist will take this into account during reporting.
How to Maintain Healthy Levels
While CEA expression in tissue is not a value that can be directly controlled, general lifestyle habits support overall cancer risk reduction:
- Eat a balanced diet with plenty of vegetables, fruits, and fibre, and limit processed foods.
- Avoid smoking and limit alcohol consumption, as both are associated with higher cancer risk.
- Keep up with regular health check-ups and cancer screening as recommended by your doctor.
Lupin Diagnostics IHC Marker - CEA (Polyclonal) Test Price
The IHC Marker - CEA (Polyclonal) test cost at Lupin Diagnostics starts at ₹1,920. This test requires a visit to a Lupin Diagnostics centre or submission of the FFPE tissue block through the referring doctor. Home collection is not available for this test.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 1920 |
| CHENNAI | 1920 |
| HYDERABAD | 1920 |
| KOLKATA | 1920 |
| NAVI MUMBAI | 1920 |
| PUNE | 1920 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book the IHC Marker - CEA test online or at a centre:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time to submit the FFPE tissue block.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
The IHC Marker - CEA test is performed on a tissue sample and detects the presence of CEA protein directly within tumour cells. A blood CEA test measures the level of CEA circulating in the bloodstream and is mainly used to monitor treatment response. The IHC test helps classify tumours and identify their origin.
The tissue sample is collected during a biopsy or surgical procedure performed by a surgeon or pathologist. The IHC Marker - CEA test procedure is then carried out in the laboratory using the preserved tissue block. No additional fresh sample collection is required at the time of booking the test.
No. A positive IHC-CEA result indicates the presence of CEA protein in the tissue and may be associated with certain cancers. However, the result alone cannot confirm a cancer diagnosis and must be interpreted alongside clinical findings, imaging results, and other pathology tests.
No fasting or special physical preparation is required before the IHC Marker - CEA test. However, a complete clinical history, previous pathology reports, and relevant radiology reports should be submitted along with the tissue block to support accurate interpretation.
Depending on the suspected tumour location, your doctor may refer you to a medical oncologist, surgical oncologist, or gastroenterologist. The appropriate specialist will interpret your results and recommend further evaluation or treatment if required.
CEA is a valuable marker for differentiating mesothelioma from adenocarcinoma. Adenocarcinomas, including many lung adenocarcinomas, commonly show positive CEA staining, while mesotheliomas are usually CEA-negative. Therefore, a negative IHC-CEA result in a pleural tumour may support a diagnosis of mesothelioma when interpreted with other markers and clinical findings.
IHC Marker - CEA (Polyclonal) Test
