IHC Marker SMA (Smooth Muscle Actin) Test: Booking, Price, and Results
About IHC Marker SMA (Smooth Muscle Actin) Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Alpha Smooth Muscle Actin IHC, α-SMA IHC, SMActin Immunostain, Actin-Smooth Muscle IHC |
| Sample Type | Formalin-fixed, paraffin-embedded (FFPE) tissue block from biopsy or surgical specimen |
| Fasting Required | No. This test is performed on a tissue sample |
| Report Time | 7 days |
| Recommended For | All genders and ages when a pathologist needs to identify smooth muscle origin tumours or myoepithelial cells |
| Price | Starting at ₹1,920 |
What is an IHC Marker SMA (Smooth Muscle Actin) Test?
The IHC marker SMA (Smooth Muscle Actin) test is a specialised laboratory test that detects a structural protein called alpha-smooth muscle actin (α-SMA) in tissue samples. It is performed using a method called immunohistochemistry (IHC), in which specific antibodies are applied to preserved tissue to detect the presence of target proteins. A pathologist analyses the stained tissue under a microscope to determine which type of cells are present and whether they show signs of smooth muscle origin. This test is also referred to as Alpha Smooth Muscle Actin IHC or SMActin Immunostain.
What Does an IHC Marker SMA (Smooth Muscle Actin) Test Measure?
The IHC marker SMA test identifies the presence and distribution of alpha-smooth muscle actin protein within tissue cells. The following cell types are assessed:
| Cell Type | Relevance |
|---|---|
| Smooth muscle cells | Found in blood vessel walls and hollow organs; their presence helps identify smooth muscle tumours |
| Myoepithelial cells | Specialised glandular cells that assist in contraction; SMA highlights these in breast and salivary gland tissue |
| Pericytes | Cells that wrap around small blood vessels; SMA helps identify their presence in tissue |
| Myofibroblasts | Cells involved in wound healing and tissue scarring; their presence can complicate the interpretation of results |
The test is qualitative, meaning it reports whether the protein is present (positive) or absent (negative). It does not produce a numerical value.
Why is an IHC Marker SMA (Smooth Muscle Actin) Test Done?
Doctors order the IHC marker SMA test when a tissue biopsy raises questions about the origin of a tumour or abnormal cell population.
Common Symptoms That May Require This Test
The following symptoms or findings may prompt a doctor to order this test:
- An unexplained mass or lump detected during physical examination or imaging
- Abnormal imaging findings that suggest a soft tissue tumour
- Tissue abnormalities found during a routine biopsy for another reason
- A suspected tumour of unknown cell origin
- Evaluation of a breast lesion to determine whether it is invasive or confined (in situ)
Conditions This Test Can Help Detect
The IHC marker SMA (Smooth Muscle Actin) test can assist in identifying or ruling out the following conditions:
- Leiomyoma (a benign tumour that originates from smooth muscle)
- Leiomyosarcoma (a malignant tumour of smooth muscle origin)
- Pleomorphic adenoma (a mixed tumour of the salivary gland)
- Inflammatory myofibroblastic tumour (IMT)
- Gastrointestinal stromal tumours (GISTs), where SMA expression can be detected in a significant proportion of cases
- Invasive carcinoma of the breast, where loss of myoepithelial cells may indicate invasion
How to Prepare and What to Expect
The IHC marker SMA test procedure uses previously collected and preserved tissue, so no blood draw or special patient preparation is needed for the test itself.
Do You Need to Fast?
No fasting is required. This test is carried out on a tissue sample obtained through a biopsy or surgical procedure, not on blood or urine.
Practical Tips Before Your Test
Keep the following points in mind before submitting your tissue sample:
- Bring a detailed clinical history, including your symptoms, previous test results, and family history, as this is required for the test
- Inform your doctor about all medications you are currently taking, as some treatments can affect SMA expression in tissue
- Bring any previous biopsy reports or imaging results to help the pathologist interpret findings accurately
- If a biopsy or surgical procedure has not yet been performed, your doctor will provide separate instructions for that procedure
Step-by-Step Procedure
The IHC marker SMA test procedure involves these steps:
- A tissue sample is first collected by your doctor through a biopsy or surgical procedure (this step is arranged separately).
- The collected tissue is fixed in formalin and embedded in paraffin wax to preserve its structure for analysis.
- Very thin sections of the preserved tissue are cut and mounted on glass slides.
- Antibodies that specifically target the SMA protein are applied to the tissue sections; these antibodies bind to the protein and are tagged with a coloured dye to make them visible.
- A trained pathologist examines the stained slides under a microscope and assesses whether the SMA protein is present or absent in the cells.
- The pathologist records findings and issues a report, which is then shared with your treating doctor.
Factors That Can Affect Accuracy
The following factors may influence the accuracy of the IHC marker SMA test:
- The type, location, and stage of the tumour can affect the amount of SMA detected in tissue
- Ongoing treatments such as chemotherapy may alter SMA expression in the sample
- The age of the paraffin-embedded tissue section can reduce staining quality; sections are ideally cut within six weeks
- Poor quality of tissue fixation or processing at the time of biopsy can affect staining reliability
Understanding Your IHC Marker SMA (Smooth Muscle Actin) Test Results
Results should always be reviewed with your doctor or pathologist, who will consider them alongside your clinical history, imaging findings, and other investigations.
| Result | Interpretation |
|---|---|
| Positive | SMA protein detected in the tissue cells |
| Negative | SMA protein not detected in the tissue cells |
A positive result indicates that the cells in the tissue sample show smooth muscle differentiation. This can occur in both benign conditions (such as leiomyoma) and malignant ones (such as leiomyosarcoma). A negative result suggests the tumour does not originate from smooth muscle, myoepithelial, or related cell types.
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
SMA is a sensitive marker for myoepithelial differentiation, but it is not specific to any single cell type. Myofibroblasts and blood vessel walls also stain positive for SMA, which can make interpretation more complex in certain breast lesions. The tumour's type, stage, and location, along with any ongoing treatment, can all influence the level of SMA expression detected in tissue.
How to Maintain Healthy Levels
Because this is a diagnostic marker rather than a wellness indicator, there are no specific lifestyle tips for SMA levels. The following general guidance applies:
- Attend regular health check-ups if you have a personal or family history of soft tissue masses
- Follow your doctor's advice on any further diagnostic tests or monitoring after receiving your results
- Keep all follow-up appointments so that findings can be reviewed in the context of your overall health
Lupin Diagnostics IHC Marker SMA (Smooth Muscle Actin) Price
The IHC marker SMA test cost at Lupin Diagnostics starts at ₹1,920. This test requires a visit to a Lupin Diagnostics centre; home collection is not available as the test uses tissue obtained through a biopsy or surgical procedure.
| 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 SMA test online at 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 or sample.
- Receive your report via email or WhatsApp within 7 days.
Frequently Asked Questions
The SMA IHC test is used to determine whether cells in a tissue sample express alpha-smooth muscle actin. This helps pathologists confirm whether a tumour originates from smooth muscle cells, myoepithelial cells, or related cell types. It is particularly useful in differentiating leiomyoma from leiomyosarcoma and in assessing breast and salivary gland lesions.
The sample is obtained through a biopsy or surgical procedure arranged separately by your doctor. The collected tissue is then fixed in formalin, embedded in paraffin, and submitted to the laboratory as an FFPE tissue block. You do not need to provide a blood or urine sample for this test.
No fasting is required. The IHC marker SMA test procedure uses preserved tissue from a previous biopsy or surgery, so there are no dietary restrictions linked to this test.
No. SMA is normally present in the smooth muscle cells of blood vessels, myoepithelial cells, and pericytes in healthy tissue. A positive result indicates that the cells show smooth muscle differentiation, which can occur in both benign tumours, such as leiomyoma, and malignant tumours, such as leiomyosarcoma. Your pathologist will consider additional features to reach a diagnosis.
No, SMA alone cannot make this distinction. Pathologists also assess features such as cell atypia (abnormal cell appearance), cell density, and the rate of cell division. The SMA result is one part of a broader diagnostic picture that includes morphology and other IHC markers.
At Lupin Diagnostics, the report is delivered within 7 days. The time taken can vary depending on the case's complexity and whether the test is part of a larger IHC panel.
No. The IHC marker SMA test requires a tissue block from a biopsy or surgical procedure, which cannot be collected at home. You will need to visit a Lupin Diagnostics centre to submit your sample. IHC marker SMA test online booking is available through the Lupin Diagnostics website.
IHC Marker SMA (Smooth Muscle Actin) Test: Booking, Price, and Results
