Positive Aquaporin-4 antibody (AQP4-IgG) result: what it means
A Aquaporin-4 antibody (AQP4-IgG) test is reported as positive or negative rather than as a number. Here is what a positive result can point to, and when it is worth discussing with a doctor.
Reference range: negative is normal; the hallmark antibody of neuromyelitis optica spectrum disorder (NMOSD) — a positive result distinguishes it from multiple sclerosis and changes treatment
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What a positive Aquaporin-4 antibody (AQP4-IgG) result can mean
- Neuromyelitis optica spectrum disorder (NMOSD) — the defining finding; a positive AQP4-IgG with typical symptoms confirms the diagnosis.
- Distinguishes NMOSD from multiple sclerosis — critical, because they need different, sometimes opposite, treatments.
- Supports a diagnosis after optic neuritis or a spinal cord attack — especially if severe or recurrent.
When to discuss with a doctor
AQP4 antibody testing is a specialist request, ordered by neurologists when someone has inflammation of the optic nerve (optic neuritis, with painful loss of vision) or the spinal cord (transverse myelitis, with weakness, numbness or bladder problems), especially when attacks are severe or recurrent, or when telling NMOSD apart from multiple sclerosis will change treatment. A positive result confirms NMOSD and directs specific therapy while steering away from certain multiple-sclerosis drugs that can worsen it. Acute attacks — sudden vision loss or new limb weakness — are urgent and need immediate neurological care. Mediora.AI shows the AQP4 antibody in context, but this is a specialist result: its interpretation, and the diagnosis and treatment of NMOSD, belong with a neurologist.
What to do after a positive result
Diet and habits do not change this result. What helps is understanding, together with a doctor, what it means in your situation.
General information, not a treatment plan - decisions about medication or target values belong with your doctor.
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Upload your test Free. Sign up with your email - no password, we send you a code.Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.