Multiple Sclerosis (MS)
Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system (brain, spinal cord, and optic nerves), in which the immune system attacks myelin — the protective covering of nerve fibers — disrupting normal nerve signal transmission over time.
MS is the most common chronic inflammatory demyelinating disease of the central nervous system. It is related to, but clinically distinct from, neuromyelitis optica spectrum disorder (NMOSD) and MOG-associated disease (MOGAD) — conditions covered separately under Demyelinating Disease on this page — which can present similarly but require different management.
Diagnosis of MS relies primarily on clinical presentation and characteristic MRI findings, evaluated against established diagnostic criteria (the McDonald criteria). Laboratory investigations play a supportive role — helping provide corroborating evidence and, importantly, helping exclude other conditions (including NMOSD and MOGAD) that can closely mimic MS.
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Tests Available at NPL
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About Multiple Sclerosis (MS)
Causes & Risk Factors
The exact cause of MS is not fully understood, but it is believed to result from a combination of genetic susceptibility and environmental factors:
• Genetic susceptibility — certain genetic markers (including HLA-DRB1) are associated with increased risk, though MS is not directly inherited in a simple pattern.
• Sex — MS affects women approximately two to three times more often than men.
• Age of onset — most commonly diagnosed between ages 20 and 40, though it can occur outside this range.
• Epstein-Barr virus (EBV) infection — strongly associated with MS risk in current research, though the exact mechanism remains under study.
• Geographic and vitamin D factors — MS is more common at higher latitudes, further from the equator, which has led to interest in a possible role for vitamin D and sun exposure.
• Smoking — associated with increased risk of developing MS and may be linked to faster disease progression.
• Family history of MS modestly increases individual risk, consistent with a genetic contribution alongside environmental triggers.
Symptoms & When to Test
MS symptoms vary widely depending on which part of the central nervous system is affected, and often occur as distinct episodes (relapses) separated by periods of stability, though some patients have a more gradually progressive course.
• Optic neuritis — eye pain and vision loss or blurring, typically in one eye
• Numbness or tingling, often affecting a limb or one side of the body
• Limb weakness
• Balance and coordination difficulties
• Persistent fatigue
• Bladder or bowel dysfunction
• Cognitive changes, including difficulty with memory or concentration
• Symptoms that worsen with heat (a recognized, though not universal, pattern in MS)
When Should You Consider Testing?
Evaluation is generally appropriate for a new neurological symptom lasting more than 24 hours — particularly involving vision, sensation, balance, or limb strength — especially in a young adult, since this presentation pattern is when MS and its mimics are most commonly considered. This evaluation is led by a neurologist and centers on MRI, with laboratory testing used in a supportive and mimic-exclusion role.
Why Tests Are Combined
No blood test diagnoses MS directly. Diagnosis is based on the McDonald criteria, which combine clinical presentation with MRI evidence of lesions disseminated in time and space (meaning lesions of different ages, in more than one location within the central nervous system) — laboratory testing supports this process rather than replacing it.
CSF oligoclonal bands and the CSF IgG index provide supportive evidence of intrathecal (within the central nervous system) antibody production, a pattern common in MS. However, these findings are not exclusive to MS and are interpreted as one piece of supporting evidence alongside MRI and clinical findings, not as a stand-alone diagnostic result.
Anti-AQP4 and Anti-MOG antibody testing is a critical step specifically to exclude NMOSD and MOGAD, since these conditions can closely resemble MS clinically and on imaging, yet require different treatment — some MS therapies can actually worsen NMOSD, which is precisely why correctly distinguishing between these conditions matters so much before treatment begins.
Additional blood tests (vitamin B12, thyroid function, ANA, and selected infectious disease screening) are used to exclude other, unrelated conditions that can produce neurological symptoms resembling MS, ensuring the diagnostic picture is as accurate as possible before committing to an MS diagnosis and treatment plan.
Tests Available at NPL
Test Code | Test | Clinical Relevance |
| Freelite – Kappa & Lamda | Supports diagnosis and monitoring of plasma cell disorders (e.g., multiple myeloma, MGUS); in CSF, the kappa index serves as a sensitive marker of intrathecal antibody synthesis in suspected multiple sclerosis. |
| IgG Synthesis Index | Indicates IgG production within the CNS rather than from a leaky blood-brain barrier; an elevated index supports a multiple sclerosis diagnosis when interpreted alongside clinical and MRI findings. |
Most autoimmune antibody tests and inflammatory markers do not require fasting. However, if your doctor has ordered other tests at the same time — such as glucose or lipid testing — fasting may be required for those investigations. Please follow the preparation instructions provided by your doctor or NPL.
Home Sample Collection
NPL offers convenient home sample collection for all Multiple Sclerosis (MS) tests, so you don't need to visit a lab in person.
→ Book your test online, via the NPL app, or by calling +977 1 5970147 and select a convenient time slot for home sample collection.
→ A certified and experienced NPL phlebotomist visits your home at the scheduled time, following strict hygiene and safety protocols.
→ Your sample is transported under controlled, monitored conditions to NPL's NABL ACCREDITED UNDER ISO 15189:2022 laboratory for processing.
→ Your digital report is delivered securely to your phone or email, along with access to download and share it as needed.
When to See a Doctor
• A new neurological symptom lasting more than 24 hours — sudden vision loss or eye pain, limb weakness or numbness, balance difficulties, or bladder/bowel changes
• Any of the above symptoms in a young adult, particularly age 20–40
• Known MS with new or worsening symptoms, which may indicate a relapse — seek prompt neurology evaluation
• Sudden, severe neurological symptoms (significant weakness, loss of vision, difficulty speaking) — seek urgent or emergency care, since these can also indicate other serious, time-sensitive conditions such as stroke
Medical Disclaimer Laboratory tests support the evaluation of multiple sclerosis but do not diagnose the condition on their own. Diagnosis requires assessment by a qualified neurologist together with clinical history, examination, and MRI findings, using established diagnostic criteria. This content is for general information only and is not a substitute for medical advice, diagnosis, or treatment. |