IHC Marker - H-Caldesmon Test
About IHC Marker - H-Caldesmon Test
| Field | Value |
|---|---|
| Also Known As | H-Caldesmon IHC Test, h-CD IHC Test, Caldesmon Immunostain Test, High-Molecular-Weight Caldesmon IHC Test |
| Sample Type | FFPE Tissue Block |
| Fasting Required | No |
| Report Time | 3 Days |
| Recommended For | Males and females, all age groups (when a smooth muscle tumour is suspected) |
| Price | Starting at ₹1,920 |
What is an IHC Marker - H-Caldesmon Test?
The IHC marker - H-Caldesmon test is a specialised immunohistochemistry (IHC) test — a laboratory technique that uses antibodies to detect specific proteins in tissue samples. This test identifies the high-molecular-weight form of the caldesmon protein, which is found in differentiated smooth muscle cells. It is also known as the Caldesmon Immunostain test or the H-Caldesmon IHC test.
Doctors order this test when a biopsy has revealed a soft tissue tumour and they need to determine whether it is of smooth muscle origin. The test is performed on a formalin-fixed, paraffin-embedded (FFPE) tissue block.
What Does an IHC Marker - H-Caldesmon Test Measure?
This test detects the presence or absence of the h-caldesmon protein in tissue. Here is what each finding reflects:
| Component | What It Tells Us |
|---|---|
| H-Caldesmon protein expression | Whether smooth muscle cells are present in the tumour tissue |
| Smooth muscle cell differentiation | Whether the tumour originates from differentiated, contractile smooth muscle cells |
| Tissue specificity | Helps distinguish smooth muscle tumours from skeletal muscle and other soft tissue tumours |
H-caldesmon is an actin and tropomyosin-binding protein that plays a role in smooth muscle contraction and relaxation. Critically, neither the heavy nor light form of caldesmon is present in skeletal muscle, making this marker particularly useful for distinguishing tumour types.
Why is an IHC Marker - H-Caldesmon Test Done?
This test is ordered when a biopsy result needs further characterisation to confirm or rule out a smooth muscle tumour.
Common Symptoms That May Require This Test
A doctor may recommend this test after a biopsy in patients presenting with the following symptoms:
- An unexplained lump or mass in the abdomen or pelvis
- Abnormal uterine bleeding
- Persistent pelvic pain
- Abdominal bloating without a clear cause
- Imaging findings (such as a CT scan or MRI) suggesting a tumour of uncertain origin
- Suspected soft tissue tumour identified during surgery or examination
Conditions This Test Can Help Detect
The H-Caldesmon IHC test assists in identifying or ruling out the following conditions:
- Leiomyoma (a benign smooth muscle tumour that shows intense positive staining)
- Leiomyosarcoma (a malignant smooth muscle tumour)
- Uterine smooth muscle tumours, distinguishing them from endometrial stromal tumours
- Endometrial stromal sarcoma (typically negative for h-caldesmon)
- Glomus tumours (small tumours arising from modified smooth muscle cells)
- Gastrointestinal stromal tumours (GIST), which are typically negative for h-caldesmon and can thus be differentiated from true smooth muscle tumours
- Myofibroblastic tumours, which can mimic smooth muscle tumours
How to Prepare and What to Expect
No special preparation is needed for this test. The tissue sample is collected by your doctor during a separate biopsy procedure.
Do You Need to Fast?
No fasting is required for this test. Preparation guidelines relate to submitting the correct tissue sample and documentation rather than dietary restrictions.
Practical Tips Before Your Test
Before submitting your sample for the IHC marker - H-Caldesmon test, keep the following in mind:
- Bring a detailed clinical history, including your symptoms, previous test results, and family history
- Carry your doctor's referral letter, which should mention the biopsy site
- Bring any existing histopathology reports if you are submitting a previously prepared paraffin block
- Include relevant imaging reports such as CT scans, MRI scans, PET scans, or X-rays
- Inform your doctor about any current medications, allergies, or underlying health conditions
Step-by-Step Procedure
The IHC marker - H-Caldesmon test procedure involves the following steps:
- Your doctor obtains a tissue sample through a biopsy, which may be a needle biopsy, incisional biopsy, or surgical removal. No separate sample collection is needed for this IHC test.
- The tissue is placed in a formalin solution to preserve it, then embedded in a paraffin wax block to create the FFPE tissue block.
- Very thin slices of the tissue block are cut using a precision instrument called a microtome and mounted on glass slides.
- Specific antibodies targeting the h-caldesmon protein are applied to the tissue sections on the slides.
- A chemical reaction causes the antibody-bound areas to produce a visible colour change, highlighting where the protein is present.
- A pathologist (a doctor specialising in examining tissues and cells) examines the stained slides under a microscope and records the result as positive or negative.
Factors That Can Affect Accuracy
Several factors can influence the reliability of this test:
- Age of the cut paraffin section — sections should ideally be cut within six weeks, as older sections may show reduced immunoreactivity
- Duration of tissue fixation in formalin — over-fixation can mask the protein and make the tissue unsuitable for IHC testing
- Quality of the original biopsy sample and how well the tissue was preserved
- Technical variables in the laboratory, such as antibody performance
- Interpretation can involve some degree of subjectivity, which is why a qualified pathologist reviews all results
Understanding Your IHC Marker - H-Caldesmon Test Results
This is a qualitative test, meaning results are reported as positive or negative rather than as a number. A pathologist reviews the stained tissue slides and provides a written report.
| Result | Interpretation |
|---|---|
| Positive | H-caldesmon protein is present; the tumour is likely of smooth muscle origin (e.g., leiomyoma, leiomyosarcoma, or glomus tumour). |
| Negative | H-caldesmon protein is absent; the tumour is less likely to be of smooth muscle origin (e.g., gastrointestinal stromal tumours (GIST), endometrial stromal sarcoma, rhabdomyosarcoma, myofibroblastic tumour). |
Disclaimer: The information in this table is a general guide. 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.
Next Steps and Diagnostic Guidance
This is a diagnostic test for tumour characterisation, not a routine wellness test. The following general guidance applies:
- Follow your oncologist's recommendations for complete tumour evaluation, as a single IHC marker is not used in isolation for diagnosis
- Maintain regular follow-up appointments if you have been diagnosed with a soft tissue tumour
- Share all relevant medical records and imaging results with your treating doctor to support accurate interpretation
Lupin Diagnostics IHC Marker - H-Caldesmon Test Price
The IHC marker - H-Caldesmon test cost at Lupin Diagnostics starts at ₹1,920. This test requires a visit to a Lupin Diagnostics centre, as it is performed on an FFPE tissue block submitted directly to the laboratory.
| 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
Here is how to book the IHC marker - H-Caldesmon test online booking through Lupin Diagnostics:
- 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 and clinical documentation
- Receive your report via email or WhatsApp within the stipulated turnaround time
Frequently Asked Questions
The IHC marker - H-Caldesmon test is used in oncology to determine whether a soft tissue tumour is of smooth muscle origin. It helps pathologists distinguish smooth muscle tumours, such as leiomyoma and leiomyosarcoma, from other tumour types with similar appearances, guiding further treatment decisions.
The test is performed on tissue already obtained through a biopsy done by your doctor — this may be a needle biopsy, incisional biopsy, or surgical removal. No additional sample collection is needed specifically for the H-Caldesmon IHC test. You simply submit the prepared FFPE tissue block to the laboratory.
No special preparation is required. However, you must bring a detailed clinical history, your doctor's referral, any existing histopathology reports, and relevant imaging records when submitting your sample. This documentation is required for the test to be processed correctly.
At Lupin Diagnostics, the report is delivered within 3 days of sample submission. Please confirm the turnaround time at the time of booking, as it may vary based on your location and workload.
A positive result means the h-caldesmon protein was detected in the tissue, indicating the tumour is likely of smooth muscle origin. This finding must be interpreted alongside other IHC markers, histological features, and clinical information. Your pathologist and treating doctor will review the result together before reaching a diagnosis.
The H-Caldesmon IHC test alone cannot distinguish between a benign leiomyoma and a malignant leiomyosarcoma, as both typically show positive staining. Additional IHC markers and a detailed assessment of the tissue's histological features are needed to make that distinction.
A pathologist — a doctor who specialises in examining tissues and cells to diagnose disease — interprets the stained slides and prepares the report. The treating clinician then reviews this report alongside imaging and other test findings to determine the next steps in your care.
IHC Marker - H-Caldesmon Test
