Anti-Aquaporin 4 Antibody Test: Booking, Price, and Results
About Anti-Aquaporin 4 Antibody Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | AQP4-IgG test, NMO-IgG test, Aquaporin-4 IgG antibody test, Anti-AQP4 antibody, Neuromyelitis optica antibody test |
| Sample Type | CSF (Cerebrospinal Fluid) |
| Fasting Required | No |
| Report Time | 4 Days |
| Recommended For | All genders; typically adults, but may be ordered for children with suspected NMOSD |
| Price | Starting at ₹4,500 |
What is an Anti-Aquaporin 4 Antibody Test?
The anti-aquaporin 4 antibody test detects the presence of specific autoantibodies (proteins produced by the immune system that mistakenly attack the body's own tissues) in a cerebrospinal fluid sample. It is primarily used to help diagnose neuromyelitis optica spectrum disorder (NMOSD), a rare inflammatory condition affecting the optic nerves and spinal cord. Doctors also use this test to distinguish NMOSD from multiple sclerosis, as the two conditions can present similarly. It is also known as the AQP4-IgG test or NMO-IgG test.
What Does an Anti-Aquaporin 4 Antibody Test Measure?
This test looks for autoantibodies that target aquaporin-4, the most abundant water channel protein in the central nervous system. These proteins sit on the surface of astrocytes, which are support cells in the brain and spinal cord. When the immune system produces antibodies against aquaporin-4, it can damage these support cells and disrupt normal nerve function.
The table below summarises the key parameters measured.
| Parameter | What it Indicates |
|---|---|
| AQP4-IgG Antibody (Qualitative) | Presence or absence of the autoantibody (Negative or Positive) |
| AQP4-IgG Antibody (Quantitative, if performed) | Level of antibody activity, reported in U/mL |
Why is an Anti-Aquaporin 4 Antibody Test Done?
A neurologist may request this test when a patient presents with symptoms that suggest NMOSD or a related condition. It helps confirm a diagnosis, guide treatment decisions, and monitor disease activity over time.
Common Symptoms That May Require This Test
Doctors typically request the anti-aquaporin 4 antibody test when a patient reports one or more of the following symptoms.
- Pain when moving the eye
- Blurred or loss of vision
- Loss of colour vision
- Weakness or paralysis in both legs
- Back pain or neck pain
- Bowel and bladder problems
- Persistent vomiting or hiccups without a clear cause
Conditions This Test Can Help Detect
This test assists in identifying or ruling out the following conditions.
- Neuromyelitis optica spectrum disorder (NMOSD), an inflammatory condition targeting the optic nerves, brainstem, and spinal cord
- Longitudinally extensive transverse myelitis (widespread inflammation across the spinal cord)
- Recurrent optic neuritis (repeated episodes of optic nerve inflammation)
- Helps differentiate NMOSD from multiple sclerosis, which requires a different treatment approach
Anti-Aquaporin 4 Antibody Test for Chronic Disease Monitoring
For patients already diagnosed with NMOSD, the anti-AQP4 antibody test may be repeated to track disease activity. Antibody levels tend to rise during relapses and fall with effective immunosuppressive treatment. Follow-up testing is typically recommended every three to six months when NMOSD is suspected or under active management.
How to Prepare and What to Expect
This test requires a cerebrospinal fluid sample, which is collected through a lumbar puncture procedure. Understanding the preparation and process can help you feel more at ease.
Do You Need to Fast?
No fasting is required before the anti-aquaporin 4 antibody test procedure. You can eat and drink normally on the day of your appointment.
Practical Tips Before Your Test
Before your appointment, keep the following points in mind.
- 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 current medications and supplements, particularly any immunosuppressants or steroids.
- If possible, testing is best done during or close to an active episode and before starting immunosuppressive therapy, as treatment can reduce antibody levels and affect results.
- Wear comfortable, loose-fitting clothing to your appointment.
- Tell your doctor about any bleeding disorders or blood-thinning medications before the procedure.
Step-by-Step Procedure
The sample for this test is collected from the cerebrospinal fluid (the clear fluid surrounding the brain and spinal cord) through a lumbar puncture, also called a spinal tap.
- You will be asked to sit or lie in a curved position to widen the spaces between the vertebrae in the lower back.
- The skin over the lower back is cleaned, and a local anaesthetic is applied to numb the area.
- A thin, sterile needle is carefully inserted between two vertebrae to collect a small amount of cerebrospinal fluid (approximately 5 ml) into a sterile container.
- The needle is removed, and a small dressing is applied to the collection site.
- You may be asked to rest briefly at the centre after the procedure.
- The collected sample is labelled, stored under appropriate conditions, and dispatched to the laboratory for analysis using the EIA (IFA) method.
Factors That Can Affect Accuracy
Several factors can influence the accuracy of the anti-aquaporin 4 antibody test.
- Use of immunosuppressants, steroids, or plasma exchange therapy, which can reduce antibody levels to undetectable amounts
- Testing during remission rather than during an active relapse, which increases the chance of a false negative result
- Certain conditions, such as tuberculosis or specific tumours, may lead to a false positive result
- Improper sample handling or delays in transport
Understanding Your Anti-Aquaporin 4 Antibody Test Results
Results from the anti-AQP4 antibody test are typically reported as negative or positive. Quantitative assays may also provide a numerical value. The table below gives a general overview of what different results may indicate.
| Result | Typical Finding | Possible Significance |
|---|---|---|
| Negative / Not Detected | No antibodies found | Absence of detectable AQP4 antibodies; does not completely rule out NMOSD |
| Positive / Detected | Antibodies present | Consistent with NMOSD; clinically significant regardless of level |
| AQP4-IgG (Quantitative) | Less than 3 U/mL (varies by assay) | Higher levels may correlate with active disease |
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 situations can alter the outcome of this test.
- Immunosuppressive treatments, including intravenous methylprednisolone and plasma exchange, can cause antibody levels to fall below detectable limits. A negative result in a patient receiving these therapies should be interpreted with caution.
- Patients with tuberculosis, certain tumours, or those receiving natalizumab treatment may occasionally show a false positive result. Your doctor will consider these possibilities when reviewing your report.
How to Maintain Healthy Levels
Since this test measures autoantibodies produced by the immune system, lifestyle changes cannot prevent their formation. However, the following general steps support overall well-being.
- Attend all follow-up appointments and report any new visual symptoms, limb weakness, or bladder changes to your doctor promptly.
- Follow your neurologist's guidance on ongoing medication and monitoring.
- Maintain a balanced diet and adequate rest to support general health during treatment.
Lupin Diagnostics Anti-Aquaporin 4 Antibody Test Price
The anti-aquaporin 4 antibody test cost at Lupin Diagnostics starts at ₹4,500. This test requires a visit to a Lupin Diagnostics centre, as home collection is not available for this test due to the specialised sample collection procedure involved.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 4500 |
| CHENNAI | 4500 |
| HYDERABAD | 4500 |
| NAVI MUMBAI | 4500 |
| PUNE | 4500 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Booking your anti-aquaporin 4 antibody test online with Lupin Diagnostics is straightforward.
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time for sample collection.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
This test detects autoantibodies targeting the aquaporin-4 protein in cerebrospinal fluid. It is primarily used to help diagnose neuromyelitis optica spectrum disorder (NMOSD) and to distinguish it from multiple sclerosis. A positive result supports an NMOSD diagnosis and guides treatment decisions.
Yes, a negative result does not completely rule out NMOSD. Some patients are seronegative but may still have the condition based on clinical and imaging findings. A negative result is also more likely if you have already started immunosuppressive treatment. Your neurologist will consider all findings together.
NMOSD typically affects three or more continuous segments of the spinal cord, while multiple sclerosis usually involves a single segment. AQP4 antibodies are specific to NMOSD and are not found in patients with MS. Correct diagnosis is important because the two conditions require different treatments.
No fasting is needed before this test. You can eat and drink as normal. However, you should inform your doctor about any medications you are taking, particularly immunosuppressants or steroids, as these can affect results.
Retesting is recommended when a patient has seronegative results but continues to have clinical relapses. It may also be considered before starting antibody-targeted or B-cell-targeted therapies. Testing during an active episode rather than during remission improves the likelihood of detecting the antibody.
Yes. Immunosuppressants, steroids, and plasma exchange therapy can reduce AQP4-IgG levels to undetectable amounts. If you are already on such treatments, inform your doctor before the test so results can be interpreted accordingly.
Reports for the anti-aquaporin 4 antibody test are typically available within 4 days of sample collection at Lupin Diagnostics. You will receive your report digitally via email or WhatsApp.
Anti-Aquaporin 4 Antibody Test: Booking, Price, and Results
