Aquaporin 4 Antibody (NMO), Serum Test: Booking, Price, and Results
About Aquaporin 4 Antibody (NMO), Serum Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | NMO-IgG, AQP4-Ab, AQP4-IgG, Anti-Aquaporin-4 Antibody, Devic's Disease Antibody, Neuromyelitis Optica Antibody |
| Sample Type | Serum (venous blood) |
| Fasting Required | No fasting required |
| Report Time | 1 day |
| Recommended For | Adults and children with suspected neurological symptoms; more common in women |
| Price | Starting at ₹4,500 |
What is an Aquaporin 4 Antibody (NMO), Serum Test?
The Aquaporin 4 Antibody (NMO), Serum Test detects specific antibodies in the blood that target aquaporin-4, a protein found on cells in the brain and spinal cord. When these antibodies are present, they can damage the nervous system and cause a rare condition called neuromyelitis optica (NMO). Doctors order this NMO test when a patient shows symptoms suggesting damage to the optic nerves or spinal cord. A small blood sample is taken from a vein in the arm and processed as serum.
What Does an Aquaporin 4 Antibody (NMO), Serum Test Measure?
This test identifies a single but clinically significant marker in the blood. The table below explains what is being detected and why it matters.
| Parameter | What It Detects | Why It Matters |
|---|---|---|
| AQP4-IgG Antibody | Autoantibodies against the aquaporin-4 water channel protein in the central nervous system | A highly specific marker for neuromyelitis optica (NMO) and related spectrum disorders |
Aquaporin-4 is the main water-channel protein in the central nervous system. When the immune system mistakenly produces antibodies against it, these antibodies attack the optic nerves and spinal cord, leading to serious neurological symptoms.
Why is an Aquaporin 4 Antibody (NMO), Serum Test Done?
This test is ordered when a doctor suspects an autoimmune condition affecting the optic nerves or spinal cord. It helps distinguish NMO from other neurological conditions that look similar.
Common Symptoms That May Require This Test
Several symptoms may prompt a doctor to request an NMO test. These include:
- Sudden eye pain or vision loss in one or both eyes
- Muscle weakness in the arms or legs
- Numbness or tingling sensations in the limbs
- Loss of bladder or bowel control
- Persistent nausea, vomiting, or hiccups with no obvious cause
- Difficulty walking or maintaining balance
Conditions This Test Can Help Detect
This Aquaporin 4 Antibody (NMO), Serum Test can help identify several conditions. These include:
- Neuromyelitis optica (NMO) is a rare autoimmune condition affecting the optic nerves and spinal cord
- Neuromyelitis optica spectrum disorder (NMOSD), a broader group of inflammatory conditions affecting the optic nerves, brainstem, and spinal cord
- Longitudinally extensive transverse myelitis, which is inflammation affecting a long section of the spinal cord
- Severe optic neuritis, which is inflammation of the optic nerve
- Differentiation from multiple sclerosis (MS), since the two conditions can appear similar but require different treatment approaches
Aquaporin 4 Antibody (NMO), Serum Test for Chronic Disease Monitoring
Once a diagnosis of NMOSD is confirmed, this test can be used to monitor how the condition is progressing over time. Antibody levels tend to rise during relapses and fall with immunosuppressive treatment. Retesting is recommended during acute attacks and during treatment-free periods, typically every 3 to 6 months, depending on clinical status.
How to Prepare and What to Expect
No special preparation is needed for this test. However, a few practical steps can help ensure the most accurate result.
Do You Need to Fast?
No fasting is required before an Aquaporin 4 Antibody (NMO), Serum Test. You can eat and drink normally on the day of your test. Fasting is not necessary regardless of the time of day you choose to have your sample collected.
Practical Tips Before Your Test
Following these steps before your appointment will help ensure accurate results:
- Bring a detailed clinical history report, including your symptoms, previous test results, and any relevant medical records, as this is required for the test
- Inform your doctor about all medications you are currently taking, particularly immunosuppressants or steroids
- Ideally, get tested during an acute episode and before starting immunosuppressive treatment, as these medicines can reduce antibody levels and affect results
- Wear a short-sleeved or loose-sleeved top so the phlebotomist can access your arm easily
- Stay well hydrated, as this makes veins easier to locate
Step-by-Step Procedure
- A trained phlebotomist (a professional who draws blood) will ask you to sit comfortably and roll up your sleeve.
- They will clean the inside of your elbow with an antiseptic wipe.
- An elastic band (tourniquet) is tied around your upper arm to help the veins stand out.
- A small needle is inserted, and approximately 3 ml of blood is collected into a gel tube.
- The band is removed, and gentle pressure is applied to the site with a cotton swab.
- The sealed sample is labelled and stored at 2 to 8 degrees Celsius before being dispatched to the laboratory for analysis using EIA (enzyme immunoassay).
Factors That Can Affect Accuracy
- Recent use of immunosuppressants, steroids, or plasma exchange therapy, which can reduce antibody levels
- Timing of the test relative to disease activity (results are most reliable during an acute attack)
- The specific assay method used by the laboratory (cell-based assay versus ELISA may have different sensitivity)
- Improper sample handling or storage conditions
- Testing during remission, when antibody levels may be naturally lower
Understanding Your Aquaporin 4 Antibody (NMO), Serum Test Results
Results from this test are reported qualitatively (as negative or positive). Your doctor will interpret the result alongside your symptoms, medical history, and other investigations.
| Parameter | Normal Result | Positive Result |
|---|---|---|
| AQP4-IgG Antibody (CBA/FACS) | Negative | Positive (with titre if elevated) |
| AQP4-IgG Antibody (ELISA) | Less than 3.0 U/mL | 3.0 U/mL or above |
A positive result is highly specific for NMO or NMOSD and is considered diagnostically significant. A negative result does not completely exclude the diagnosis, as a small proportion of people with NMOSD do not produce detectable levels of this antibody (known as seronegative NMOSD). In such cases, a doctor may recommend testing for MOG antibodies as the next step.
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 affect how results should be interpreted:
Antibody levels may fall below detectable limits in patients receiving immunosuppressive therapy or after plasma exchange treatment. A negative result in these circumstances does not necessarily mean the condition is absent. Levels are known to rise again during clinical relapses, so retesting during an acute episode is often recommended if initial results are negative but clinical suspicion remains high.
Low-positive ELISA results may also be less specific for NMOSD, and a cell-based assay may be used to confirm these findings.
How to Maintain Healthy Levels
These general wellness tips support nervous system health and help patients manage their condition:
- Attend regular follow-up appointments with your neurologist to track disease activity over time
- Report any new or worsening symptoms, such as changes in vision, weakness, or numbness, to your doctor promptly
- Follow your prescribed treatment plan consistently, as this can help reduce the frequency and severity of relapses
Lupin Diagnostics Aquaporin 4 Antibody (NMO), Serum Test Price and Home Collection
The Aquaporin 4 Antibody (NMO), serum test is available at Lupin Diagnostics starting at ₹4,500, with home sample collection available across cities. The table below gives an overview of approximate prices in major cities.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 4500 |
| CHENNAI | 4500 |
| HYDERABAD | 4500 |
| KOLKATA | 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
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers NMO test home collection across multiple cities, making it convenient for patients with limited mobility or neurological symptoms. All samples are processed in NABL-accredited laboratories by experienced professionals. Digital reports are shared directly with you once ready.
Frequently Asked Questions
This test is used to help diagnose neuromyelitis optica (NMO) and related spectrum disorders. It detects antibodies that attack the aquaporin-4 protein in the brain and spinal cord. It is also useful for distinguishing NMO from multiple sclerosis, which can have similar symptoms but requires different treatment.
Not necessarily. Around 10 to 30 percent of patients with NMOSD may test negative for AQP4 antibodies. If symptoms strongly suggest NMO, your doctor may recommend additional tests such as MOG antibody testing or repeat testing during an acute attack when antibody levels may be higher.
Yes. Immunosuppressants, steroids, and plasma exchange therapy can reduce antibody levels and may lead to a false negative result. For best accuracy, testing is ideally done during an active attack and before starting immunosuppressive treatment. Always inform your doctor about all medications you are taking.
The AQP4-IgG antibody detected in this test is highly specific to neuromyelitis optica and is not found in multiple sclerosis. This makes the test useful for distinguishing between the two conditions, which require different treatment approaches.
Doctors may recommend this test for sudden vision loss or eye pain (optic neuritis), weakness or numbness in the limbs (transverse myelitis), or unexplained persistent hiccups, nausea, or vomiting. These symptoms together may suggest NMO or related disorders.
Repeat testing is usually recommended during acute attacks or when not on immunosuppressive therapy. If the initial result is negative but suspicion remains, your doctor may suggest retesting within 3 to 6 months based on clinical need.
The test involves a standard blood draw using a small needle to collect a blood sample from a vein in the arm. It is generally only mildly uncomfortable and takes a few minutes. Any discomfort usually resolves quickly after the sample is taken.
Aquaporin 4 Antibody (NMO), Serum Test: Booking, Price, and Results
