NMO Antibodies, Serum

Also referred as

Anti-Aquaporin-4 / NMO Antibodies (Neuromyelitis Optica Antibodies) Test

Aquaporin 4 Antibody

Neuromyelitis Optica Antibody Test

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Know more about this test

The NMO Antibodies, Serum test is a blood test that detects the presence of antibodies against aquaporin-4, a water channel protein in the central nervous system. These antibodies are closely associated with neuromyelitis optica spectrum disorder (NMOSD), a rare autoimmune disorder that primarily affects the optic nerves and spinal cord.

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Understanding NMO Antibodies, Serum

Anti-aquaporin 4 antibodies, also known as NMO antibodies, are autoantibodies that target aquaporin-4 (AQP4), a protein found on the surface of cells in the brain, spinal cord, and optic nerves. Aquaporin-4 plays an important role in regulating water balance in the central nervous system. When these antibodies are present, they indicate that the immune system is mistakenly attacking AQP4, leading to damage to the nervous system.

This autoimmune response is closely associated with neuromyelitis optica spectrum disorder (NMOSD), which includes classic neuromyelitis optica (NMO or Devic’s disease) as well as related conditions affecting the optic nerves and spinal cord. NMO is a rare inflammatory disorder in which the immune system attacks the optic nerves and spinal cord, causing demyelination (damage to the protective myelin sheath of nerve fibers). The disease can affect one optic nerve and the spinal cord either simultaneously or within a few months, resulting in neurological symptoms.

The NMO Antibodies, Serum test detects these antibodies in the blood, supports early diagnosis and management of NMO. Early detection allows doctors to plan appropriate treatment, monitor disease progression, and reduce the risk of relapses and long-term neurological disability.

The test is recommended for individuals presenting with neurological symptoms such as sudden vision loss, optic neuritis, transverse myelitis (inflammation of the spinal cord), or unexplained neurological episodes. It is also useful for distinguishing NMOSD from other autoimmune and demyelinating conditions, including multiple sclerosis, which may have overlapping symptoms.

No special preparation is needed for the NMO Antibodies, Serum test. However, be sure to inform the doctor about any medications or supplements being taken, as they may affect the test results.

Lab test results may vary across different laboratories. Abnormal test results require expert interpretation. Therefore, never try to self-medicate based solely on these results. Always consult a doctor for a proper understanding of the test results.

Please note: This is an outsourced test. The sample for this test is collected by TATA 1MG and processed at a NABL accredited partnered lab.

What does NMO Antibodies, Serum measure?

The NMO Antibodies, Serum test detects anti-AQP4 antibodies in the blood. These autoantibodies target aquaporin-4, a protein essential for maintaining water balance in the central nervous system. Their presence indicates an autoimmune reaction, where the immune system mistakenly attacks the nervous system.

AQP4 antibodies are found in the majority of patients with NMOSD. A positive result suggests a high likelihood of NMOSD and indicates the need for immunosuppressive treatment to prevent relapses. However, not all patients with NMOSD test positive for AQP4 antibodies, and occasionally, these antibodies may appear in other autoimmune neurological disorders. A negative result does not completely rule out NMOSD but makes the diagnosis less likely. Results should always be interpreted in conjunction with clinical symptoms, neurological examination, MRI findings, and other laboratory studies.

Test Information is reviewed by: Dr. Swati Gupta (Anand), MBBS, MD Lab Medicine and written by Dr. Lipika Khurana, BDS, PGDHHM . The test details are for information purpose only. Consult a doctor before taking any test. Last updated on: 20th Aug 2026

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NMO Antibodies, Serum test price for other cities

Price in	Mumbai	Rs. 4409
Price in	Kolkata	Rs. 5149
Price in	Aligarh	Rs. 4190
Price in	Amritsar	Rs. 4190
Price in	Asansol	Rs. 4660

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FAQs related to NMO Antibodies, Serum

What is the NMO Antibodies, Serum test?

It is a blood test that detects antibodies against aquaporin-4, a protein in the brain and spinal cord. These antibodies are linked to neuromyelitis optica spectrum disorder (NMOSD), an autoimmune condition affecting vision and spinal cord function.

Why is this test done?

The test is done to support the diagnosis of NMOSD, especially in people with sudden vision loss, optic neuritis, or spinal cord inflammation (transverse myelitis). It also helps differentiate NMOSD from multiple sclerosis.

Who should get this test?

People with sudden vision loss, recurrent optic neuritis, unexplained spinal cord inflammation, or suspected autoimmune demyelinating disorders may need this test.

How is the test done?

A small blood sample is collected, usually from a vein in your arm. The sample is then analyzed in a lab for the presence of anti-AQP4 antibodies.

Do I need to fast before the test?

No fasting is required for this test.

Are there any risks or side effects?

The test is generally safe. You may experience minor discomfort or bruising at the blood collection site.

What does a positive result mean?

A positive result indicates the presence of anti-AQP4 antibodies, suggesting that the immune system is attacking nerve tissue in the central nervous system. This supports a diagnosis of NMOSD.

What does a negative result mean?

A negative result reduces the likelihood of NMOSD but does not completely rule it out, as some patients may be seronegative (antibodies not detectable).

What is neuromyelitis optica spectrum disorder (NMOSD)?

NMOSD is a rare autoimmune disorder where the body’s immune system attacks the optic nerves and spinal cord, causing vision problems, weakness, and numbness.

What is optic neuritis?

Optic neuritis is inflammation of the optic nerve, which can cause sudden vision loss, blurred vision, or pain in the eyes.

What is transverse myelitis?

Transverse myelitis is inflammation of a part of the spinal cord. It can cause limb weakness, numbness, tingling, and sometimes bladder or bowel problems.

Can NMOSD be confused with multiple sclerosis (MS)?

Yes, NMOSD can have similar symptoms to MS, but they are different diseases. Tests like the anti-Aquaporin 4 antibody test help doctors tell them apart.

Who is at risk of NMOSD?

NMOSD can affect both men and women at any age, but it is more common in adults and in females. People with a family history of autoimmune disorders may have a higher risk.

Are NMOSD and multiple sclerosis the same?

No, they are not the same. While they can have similar symptoms, NMOSD and MS are different disorders. The Anti-Aquaporin 4 Antibody Test helps doctors tell them apart.

Is NMOSD treatable?

Yes, treatments like immunotherapy and medications that suppress the immune system can help reduce relapses and manage symptoms.

How does Tata 1mg ensure accurate lab test results?

Tata 1mg ensures accurate lab test results through certified laboratories that use advanced technology and adhere to stringent quality control measures. This commitment to high standards guarantees reliable results.

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