IHC Marker - p16 Test: Booking, Price, and Results
About IHC Marker - p16 Test
| Field | Value |
|---|---|
| Also Known As | p16INK4a IHC, p16 Immunohistochemistry, CDKN2A Immunostain, p16 Biomarker Test, p16(INK4a) |
| Sample Type | Formalin-fixed, paraffin-embedded (FFPE) tissue block |
| Fasting Required | No |
| Report Time | 3 days |
| Recommended For | Adults of any gender; typically ordered when cancer or precancerous changes are suspected |
| Price | Starting at ₹3,600 |
What is an IHC Marker - p16 Test?
The IHC marker - p16 test is a specialised tissue-based analysis that detects the presence and amount of p16 protein in a tissue sample. Also known as p16 Immunohistochemistry or the CDKN2A Immunostain, this test is ordered when a doctor suspects certain cancers or precancerous changes, particularly those linked to human papillomavirus (HPV) infection. The sample used is a tissue block collected during a biopsy or surgical procedure.
What Does an IHC Marker - p16 Test Measure?
The test uses a laboratory technique called immunohistochemistry (IHC) to stain tissue sections and reveal where and how strongly the p16 protein is expressed. The key elements assessed are described below.
| Component | What It Tells Us |
|---|---|
| p16 protein (p16INK4a/CDKN2A) | A cell cycle regulatory protein; its overexpression often signals HPV-driven cellular change |
| Tumour suppressor activity | p16 normally prevents uncontrolled cell division; loss or alteration of this function is linked to cancer |
| HPV-related overexpression | Elevated p16 staining acts as a surrogate marker for high-risk HPV infection in squamous cell cancers |
Why is an IHC Marker - p16 Test Done?
Doctors order the p16 IHC test when tissue findings suggest the possibility of cancer or precancerous lesions. Below are the common reasons this test is requested.
Common Symptoms That May Require This Test
The following symptoms or findings often prompt a doctor to request this test:
- Abnormal vaginal bleeding, including bleeding after intercourse or between periods
- Unusual vaginal discharge
- Pelvic pain
- Abnormal Pap smear results
- Positive high-risk HPV test
- Persistent sore throat
- Difficulty or pain while swallowing (dysphagia)
- Lump in the neck
- Unexplained ear pain
- Hoarseness or other voice changes
- Symptoms related to cancers of the throat, tonsils, or base of the tongue
Conditions This Test Can Help Detect
The p16 Immunohistochemistry result helps pathologists identify or confirm several conditions:
- Cervical intraepithelial neoplasia grades 1, 2, and 3 (CIN I, II, III): varying degrees of precancerous cervical change
- Cervical cancer
- Head and neck squamous cell carcinoma: cancer of the mouth, throat, or voice box
- Anal cancer and other HPV-related conditions
- High-grade serous carcinoma: of the ovary, fallopian tube, or endometrium
How to Prepare and What to Expect
No special preparation is needed for the IHC marker - p16 test procedure. The key point to understand is that the test is performed on a tissue sample, not a blood or urine sample, so the steps differ from a routine blood test.
Do You Need to Fast?
No fasting is required for this test. There are no dietary restrictions before or after the tissue sample is collected.
Practical Tips Before Your Test
The following steps will help ensure a smooth experience:
- Bring a detailed clinical history, including your symptoms, previous test results, and any relevant family history, as this information is required for the test
- Inform your doctor about all medications you are currently taking
- Ask your treating doctor which type of biopsy procedure will be used and where it will take place
- Wear comfortable clothing on the day of the biopsy procedure
Step-by-Step Procedure
The process from tissue collection to result involves the following steps:
- A doctor or surgeon collects a tissue sample during a biopsy or surgical procedure at a healthcare facility. This step cannot be performed at home.
- The tissue is fixed in formalin to preserve its cellular structure and proteins, then embedded in paraffin wax to create the FFPE tissue block.
- The block is transported to the laboratory at ambient temperature (18 to 28 degrees Celsius) and logged in for processing.
- Thin sections of the tissue are cut and stained using the immunohistochemistry method, which allows pathologists to see where the p16 protein is present.
- A qualified pathologist examines the stained sections under a microscope and assesses the pattern and extent of p16 staining.
- A written report is prepared and delivered to your doctor within 3 days.
Factors That Can Affect Accuracy
- Use of fixatives other than 10% neutral buffered formalin, which may affect staining quality
- Insufficient tissue sample size
- Improper tissue preservation or processing before reaching the laboratory
- Absence of a clinical history, which is needed for accurate interpretation
- Interpretation must be carried out by a trained pathologist alongside other diagnostic findings
Understanding Your IHC Marker - p16 Test Results
Your doctor will review your p16 IHC test result together with your clinical history and any other investigations. The table below outlines the general interpretation framework used by pathologists.
| p16 Expression | Staining Pattern | Interpretation |
|---|---|---|
| Negative | <70% strong diffuse staining | No significant p16 overexpression |
| Positive | ≥70% strong diffuse nuclear and cytoplasmic staining | Supports HPV-associated oropharyngeal squamous cell carcinoma |
For lower anogenital and cervical lesions, a positive result is defined as continuous strong staining in the basal layer of cells extending upward through at least one-third of the tissue thickness.
Disclaimer: 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
- HPV-independent mechanisms: p16 overexpression can occur through mechanisms unrelated to HPV. In ovarian serous carcinoma, for example, elevated p16 expression reflects a different underlying disease process and does not indicate HPV infection.
- Tumour Grade: High-grade ovarian serous carcinoma typically shows much higher p16 expression than low-grade forms, reflecting this distinct pathogenesis.
How to Maintain Healthy Levels
These general wellness tips may help reduce your risk of HPV-related conditions:
- Attend regular cervical screening (Pap tests) as advised by your doctor
- Ask your doctor about HPV vaccination, which can help prevent several HPV-related cancers
- Avoid tobacco use, as it raises the risk of head and neck cancers
Lupin Diagnostics IHC Marker - p16 Test Price
The IHC marker - p16 test cost at Lupin Diagnostics starts at ₹3,600. This test requires a visit to a Lupin Diagnostics centre or the submission of a prepared FFPE tissue block; home collection is not available for this test.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 3600 |
| CHENNAI | 3600 |
| HYDERABAD | 3600 |
| KOLKATA | 3600 |
| NAVI MUMBAI | 3600 |
| PUNE | 3600 |
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 - p16 test online:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time to submit your FFPE tissue block or have the sample processed.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
The p16 IHC test is used to detect the overexpression of the p16 protein in tissue samples. It helps doctors diagnose and classify certain cancers, particularly cervical cancer and head and neck squamous cell carcinoma, and identify precancerous lesions linked to HPV infection.
No, they are different tests. The p16 Immunohistochemistry test detects the p16 protein in tissue, which acts as a surrogate marker for high-risk HPV infection. An HPV test, by contrast, directly detects the virus itself. Both may be used together to give a clearer picture.
The sample is collected by a doctor or surgeon during a biopsy or surgical procedure at a healthcare facility. The resulting tissue block is then sent to the laboratory. This step must be carried out by a trained professional and cannot be done at home.
At Lupin Diagnostics, the report is typically available within 3 days of the laboratory receiving the tissue block. Turnaround time may vary slightly depending on sample quality and processing requirements.
A positive result means the p16 protein is strongly overexpressed in a significant proportion of the tissue cells. This finding may suggest an HPV-associated lesion or certain types of cancer. Your doctor will interpret the result alongside your clinical history and any other tests before drawing any conclusions.
If your p16 IHC test result is abnormal, your treating doctor will typically refer you to an oncologist (a cancer specialist) or a gynaecological oncologist, depending on the site and nature of the lesion. They will guide you on the next steps.
This test alone is not sufficient to confirm a cancer diagnosis. It is one part of a broader diagnostic process. A pathologist interprets the staining result in the context of your complete clinical history, other laboratory findings, and imaging studies before a final diagnosis is made.
IHC Marker - p16 Test: Booking, Price, and Results
