Relapsing-remitting multiple sclerosis – Diagnostics – Overview of Information and Clinical Research

Getting the right diagnosis is the first step toward managing relapsing-remitting multiple sclerosis. This process involves careful evaluation of your symptoms, imaging studies of your brain and spinal cord, and sometimes laboratory tests. Understanding what to expect during diagnostic testing can help reduce anxiety and prepare you for the journey ahead. Whether you’re experiencing your first symptoms or need monitoring for disease activity, modern diagnostic tools help doctors make informed decisions about your care.

Introduction: When to Seek Diagnostic Evaluation

If you notice new or unusual symptoms that affect your vision, balance, coordination, sensation, or muscle strength, it’s important to talk with a healthcare provider. The earlier relapsing-remitting multiple sclerosis is identified, the sooner treatment can begin, potentially helping to prevent lasting damage to your nervous system^[1].

People who should consider seeking diagnostic evaluation include those experiencing sudden vision problems, particularly eye pain combined with blurred or double vision. These problems may be early signs of optic neuritis, which means inflammation of the optic nerve and is often one of the first symptoms people with RRMS experience^[6]. Other warning signs include numbness or tingling in various parts of your body, unexplained muscle weakness, difficulty walking or maintaining balance, and unusual fatigue that doesn’t improve with rest.

Sometimes symptoms can be temporary and disappear on their own, which can make it confusing to know when to seek help. However, if symptoms last for more than 24 hours or if you notice a pattern where symptoms come and go, you should contact a healthcare provider. Even if symptoms improve, getting evaluated is important because damage to the nervous system can occur without obvious symptoms, especially early in the disease^[13].

Not everyone with these symptoms will have multiple sclerosis. Many other conditions can cause similar problems, which is why a thorough diagnostic evaluation is necessary. Your healthcare provider will need to rule out other conditions that might explain your symptoms before confirming an MS diagnosis.

⚠️ Important

An MS relapse must involve symptoms that last at least 24 hours, occur at least 30 days after any previous relapse, and have no other explanation like fever or infection. If you’re unsure whether you’re experiencing a relapse or just day-to-day symptom fluctuation, wait a day or two to see if symptoms improve before contacting your healthcare team^[15].

Classic Diagnostic Methods for RRMS

Diagnosing relapsing-remitting multiple sclerosis is not straightforward because there isn’t a single test that can confirm or rule out the condition. Instead, doctors use a combination of different tests and information to build a complete picture. The diagnostic process typically involves taking your medical history, conducting physical examinations, performing imaging studies, and sometimes running laboratory tests^[4].

Medical History and Neurological Examination

Your healthcare provider will start by asking detailed questions about your symptoms. They’ll want to know when symptoms started, how long they lasted, and whether they’ve come and gone over time. This pattern of symptoms appearing and then partially or completely disappearing is what characterizes the “relapsing-remitting” nature of RRMS. Your doctor will also ask about your overall health, family history of autoimmune diseases, and any infections you’ve had, particularly Epstein-Barr virus, which has been linked to MS risk^[1].

The neurological examination is a hands-on assessment where your doctor checks how well different parts of your nervous system are working. They will test your vision, looking for problems with color perception, eye movements, and clarity. They’ll assess your sense of balance and coordination, often asking you to walk in a straight line or perform specific movements. Your doctor will also test sensation in different parts of your body by touching your skin to see if you can feel light touch, pinpricks, or temperature changes. Muscle strength and reflexes are checked by asking you to push or pull against resistance and by tapping certain areas with a small hammer^[7].

Magnetic Resonance Imaging (MRI)

Magnetic resonance imaging, or MRI, is the most important test for diagnosing RRMS. An MRI uses powerful magnets and radio waves to create detailed pictures of your brain and spinal cord. This test can find areas of damage, called lesions or sclerosis, which are scar-like patches that form when the immune system attacks the protective covering around nerve fibers^[3].

During an MRI scan, you’ll lie still inside a large tube-shaped machine for about 30 to 60 minutes. The machine makes loud thumping and humming sounds, so you’ll be given earplugs or headphones. Some people feel uncomfortable in the enclosed space, but the test doesn’t hurt and doesn’t involve any radiation. Sometimes a contrast dye is injected into a vein in your arm before or during the scan. This dye helps highlight areas of active inflammation, showing which lesions are new and which are old.

The MRI can reveal lesions in specific areas of the brain and spinal cord that are typical of MS. Doctors look for lesions in multiple locations and try to determine if they developed at different times. Finding damage in at least two separate areas of the central nervous system (the brain and spinal cord) that occurred at different times is a key criterion for diagnosing MS. Some lesions might be “silent,” meaning they don’t cause noticeable symptoms but still show disease activity^[13].

Spinal Tap (Lumbar Puncture)

A spinal tap, also called a lumbar puncture, involves collecting a small sample of the fluid that surrounds your brain and spinal cord. This fluid is called cerebrospinal fluid or CSF. The procedure is done to look for signs of inflammation and to rule out other conditions that might mimic MS, such as infections.

During the procedure, you’ll lie on your side or sit leaning forward. The doctor will numb an area on your lower back with a local anesthetic, then insert a thin needle between two bones in your spine to collect a small amount of fluid. The procedure usually takes about 30 minutes, though the actual collection only takes a few minutes. You might feel some pressure or brief discomfort, but it shouldn’t be extremely painful. After the procedure, you may need to lie flat for a while to reduce the risk of getting a headache.

Laboratory technicians will analyze the cerebrospinal fluid for specific proteins and immune cells that suggest MS. Many people with MS have elevated levels of certain proteins called oligoclonal bands in their cerebrospinal fluid. While finding these bands supports an MS diagnosis, not everyone with MS has them, and their absence doesn’t rule out the disease^[4].

Blood Tests

There is no blood test that can diagnose MS directly. However, blood tests play an important role by helping to rule out other conditions that can cause similar symptoms. Many diseases can mimic MS, including vitamin B12 deficiency, Lyme disease, lupus, and other autoimmune conditions. Your doctor may order several blood tests to check for these alternative explanations^[3].

Blood tests might include a complete blood count, vitamin levels (especially vitamin B12 and vitamin D), thyroid function tests, and tests for various autoimmune markers. In some cases, doctors may test for antibodies against specific proteins like aquaporin-4, which is associated with a condition called neuromyelitis optica spectrum disorder that can be confused with MS but requires different treatment^[7].

Eye Examinations

Because vision problems are common in RRMS, your doctor may recommend special eye tests. One test called optical coherence tomography, or OCT, uses light waves to take pictures of the back of your eye, including the retina and optic nerve. This test can detect damage to the optic nerve that might not be visible during a regular eye exam. The OCT scan is quick, painless, and doesn’t require any contact with your eye^[4].

Evoked Potentials Testing

Sometimes doctors use tests called evoked potentials to measure how quickly electrical signals travel through your nervous system. The most common type for MS diagnosis is the visual evoked potential test, which measures how your brain responds to visual stimulation. During this test, you’ll watch a pattern on a screen while electrodes placed on your scalp measure your brain’s electrical activity. If the signals travel more slowly than normal, it might indicate damage to the myelin sheath, the protective covering around nerves that MS attacks.

Distinguishing RRMS from Other Types of MS

It’s not always immediately clear which type of MS someone has, especially at the time of diagnosis. The classification depends on observing the pattern of symptoms over time. If you have clear episodes of symptoms that flare up (relapses) followed by periods of recovery or stability (remissions), you’ll likely be diagnosed with relapsing-remitting MS. During remissions, symptoms may completely disappear, or some may persist but remain stable^[2].

Keeping a diary of your symptoms can be very helpful. Write down when new symptoms appear, how severe they are, and how long they last. Also note when symptoms improve or disappear. This information helps your healthcare team determine if you’re having true relapses or if symptoms are fluctuating for other reasons, like heat, stress, or infections. These temporary worsening of symptoms without actual new inflammation are called pseudoexacerbations^[6].

⚠️ Important

Many factors can temporarily worsen MS symptoms without representing a true relapse. Heat, infections (even minor ones like urinary tract infections), stress, vitamin D deficiency, and smoking can all trigger symptom flare-ups. When these triggers are removed or treated, symptoms should improve. Understanding the difference between a true relapse and a pseudoexacerbation helps you and your doctor make better treatment decisions^[1].

Diagnostics for Clinical Trial Qualification

If you’re considering participating in a clinical trial for RRMS, you’ll need to undergo specific tests to determine if you qualify. Clinical trials have strict entry criteria to ensure that researchers can accurately measure whether an experimental treatment works and is safe for a specific group of patients.

Confirming RRMS Diagnosis

Clinical trials typically require that your RRMS diagnosis be confirmed according to specific medical criteria. The most commonly used criteria are the McDonald criteria, which were developed by an international panel of MS experts. These criteria require evidence of damage in at least two separate areas of the central nervous system that occurred at different times, with other possible diagnoses ruled out.

You’ll need recent MRI scans of your brain and often your spinal cord. These scans must show the characteristic pattern of lesions seen in MS. Some trials specify exactly how many lesions you must have or require evidence of active disease, meaning new lesions or lesions that light up with contrast dye, indicating recent inflammation.

Disease Activity Assessment

Many clinical trials are looking for participants who have active disease, meaning they’ve experienced recent relapses or their MRI scans show new or enlarging lesions. Trials may require that you’ve had at least one or two relapses within the past year or two years. You’ll need documentation of these relapses from your healthcare provider, including when they occurred, what symptoms you experienced, and how they were treated^[12].

Some trials also measure disease activity through something called the Expanded Disability Status Scale, or EDSS. This is a standardized way of quantifying disability in MS based on a neurological examination. The scale ranges from 0 (no disability) to 10 (death due to MS). Different trials may look for participants within specific EDSS ranges.

Baseline MRI and Regular Monitoring

Before you can enroll in a clinical trial, you’ll typically need a baseline MRI. This serves as a starting point to compare against future scans to see if the treatment being studied affects disease progression. During the trial, you’ll likely have regular MRI scans, perhaps every few months or yearly, depending on the study design. These scans help researchers track whether new lesions develop and whether existing lesions change^[13].

Blood and Laboratory Tests

Clinical trials require extensive blood testing to ensure it’s safe for you to receive the experimental treatment. Baseline blood tests will check your liver function, kidney function, blood cell counts, and immune system status. Some trials exclude people with certain infections, like hepatitis B or C, or HIV, because the experimental treatment might affect the immune system in ways that could make these infections worse.

Throughout the trial, you’ll have regular blood draws to monitor how your body is responding to the treatment and to watch for potential side effects. Researchers track things like white blood cell counts, which are important for fighting infections, and liver enzymes, which can indicate if the treatment is affecting liver function.

Neurological Function Tests

Clinical trials include regular neurological examinations to assess whether the treatment affects your symptoms and disability level. In addition to the physical examination, you might undergo various standardized tests to measure specific functions. These could include a timed 25-foot walk test to measure walking speed and endurance, a nine-hole peg test to assess hand coordination and dexterity, and vision tests to check for changes in visual function.

Some trials also include cognitive testing to measure thinking and memory abilities, as MS can affect these functions. You might complete questionnaires about your quality of life, fatigue levels, and how MS symptoms affect your daily activities.

Documentation of Current Treatment

Clinical trials need to know what treatments you’re currently taking or have taken in the past. Some trials are only open to people who haven’t started any disease-modifying therapy (medication designed to slow MS progression), while others may enroll people who are already on treatment but still experiencing disease activity. You’ll need to provide detailed information about any MS medications you’ve taken, including when you started and stopped them and why you discontinued them if you did.

Exclusion Criteria Screening

Clinical trials have exclusion criteria, which are conditions or circumstances that would prevent you from safely participating. Common exclusions include pregnancy or plans to become pregnant during the trial, certain other medical conditions, recent or planned surgeries, and use of certain medications that might interact with the experimental treatment. You’ll undergo screening tests to ensure you don’t meet any exclusion criteria.

Prognosis and Survival Rate

Prognosis

The outlook for people with relapsing-remitting multiple sclerosis varies considerably from person to person, and the disease course can be unpredictable. Some people experience relatively mild symptoms throughout their lives, while others face more significant challenges. The pattern of relapses and remissions means that symptoms can improve significantly after a flare-up, with many people experiencing partial or complete recovery during remission periods^[1].

Several factors can influence how the disease progresses. Starting treatment early with disease-modifying medications has been shown to help slow progression and reduce the frequency of relapses. People who stick with their treatment plan consistently tend to have better outcomes than those who stop and start medications^[16].

After living with relapsing-remitting MS for about 10 to 20 years, many people find that their disease pattern changes. The clear distinction between relapses and remissions may become less obvious, and symptoms may gradually worsen over time without distinct flare-ups. This change is called secondary progressive multiple sclerosis. However, modern treatments may help delay or prevent this progression, though the long-term benefits of these medications are still being studied^[11].

Lifestyle factors also play an important role in prognosis. Research shows that people who maintain healthy habits—including regular exercise, a balanced diet rich in fruits and vegetables, adequate vitamin D levels, avoiding smoking, and managing stress—tend to have better outcomes. Exercise in particular has been shown to strengthen muscles, reduce fatigue, improve mood, and potentially slow damage in the brain^[16].

Managing other health conditions is equally important for the overall prognosis. Conditions like heart disease, diabetes, lung disease, and depression can all make MS progress more quickly, so working with healthcare providers to address these issues can help maintain better function and quality of life^[16].

Survival rate

Most people with relapsing-remitting multiple sclerosis have a life expectancy that approaches that of the general population, especially with modern treatments. Research indicates that roughly one-third of people with untreated MS develop significant physical disability within 20 to 25 years of their first symptoms appearing. However, several MS treatments have been shown to slow this progression, which means that people starting treatment today may have better long-term outcomes than those estimates suggest^[6].

It’s important to understand that having RRMS does not mean a shortened lifespan for most people. With appropriate medical care, treatment, and lifestyle management, many people with RRMS live full, active lives. The focus of care is on maintaining quality of life, managing symptoms, reducing relapses, and slowing disease progression rather than on survival itself.