Tests used in MS diagnosis
| Test | What it shows |
|---|---|
| MRI brain & spine | Demyelinating lesions — the primary diagnostic tool |
| Lumbar puncture (CSF) | Oligoclonal bands in 85–95% of MS patients |
| Visual evoked potentials (VEP) | Delayed nerve conduction — optic neuritis history |
| Anti-AQP4 antibody | Positive in neuromyelitis optica (NMOSD) — rules out MS |
| Anti-MOG antibody | MOG antibody disease — another MS mimic |
| Vitamin B12 | B12 deficiency can mimic MS symptoms |
| ANA, ANCA, anti-dsDNA | Rule out lupus and vasculitis as MS mimics |
Why blood tests can't diagnose MS
MS is a clinical and radiological diagnosis
There is no single blood test that diagnoses MS. The diagnosis is based on the McDonald criteria — demonstrating lesions disseminated in space and time on MRI, plus ruling out other conditions. Blood tests are primarily used to exclude MS mimics: vitamin B12 deficiency, lupus, neuromyelitis optica (NMO), Lyme disease, HIV and sarcoidosis. CSF oligoclonal bands support the diagnosis but are not required if MRI criteria are met.
Types of MS
| Type | Description |
|---|---|
| Relapsing-remitting MS (RRMS) | 85% of cases — attacks followed by recovery periods |
| Secondary progressive MS (SPMS) | Gradual worsening after initial relapsing phase |
| Primary progressive MS (PPMS) | Gradual worsening from onset without relapses |
Questions to ask your neurologist
- Do I meet the McDonald criteria for MS?
- Have AQP4 and MOG antibodies been checked?
- Which disease-modifying therapy is right for my type of MS?
- How often should I have MRI monitoring?
Medical Disclaimer: For educational purposes only. Always consult a qualified healthcare professional for diagnosis and treatment.