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

Getting a correct diagnosis is the first step in understanding and managing relapsing multiple sclerosis. From brain scans to blood tests, these diagnostic tools help healthcare providers determine if you have the condition, how active your disease is, and whether you qualify for clinical trials studying new treatments.

Introduction to Diagnostics for Relapsing Multiple Sclerosis

If you’re experiencing symptoms that could be related to relapsing multiple sclerosis, it’s important to seek medical evaluation as soon as possible. People who should consider getting tested include those experiencing new or worsening vision problems, unexplained numbness or tingling in various parts of the body, unusual weakness, balance difficulties, or bladder problems that don’t have an obvious cause.^[1]^[4]

Early diagnosis is particularly important because treatments work best when started soon after the disease begins. The earlier you begin appropriate therapy, the better the chances of slowing disease progression and preventing damage to your nervous system.^[6] If you notice symptoms lasting more than 24 hours that can’t be explained by other factors like heat, infection, or stress, it’s time to contact a healthcare professional.^[15]

Young adults between the ages of 20 and 50 are most commonly diagnosed with relapsing forms of multiple sclerosis, though the condition can appear at other ages as well. Women are about two to three times more likely than men to develop the condition, so women experiencing neurological symptoms should be especially vigilant about seeking evaluation.^[5]^[13]

Classic Diagnostic Methods

Diagnosing relapsing multiple sclerosis can be challenging because there isn’t a single test that can confirm or rule out the condition. Instead, healthcare providers use a combination of tests and information to make an accurate diagnosis. The process involves ruling out other diseases that can cause similar symptoms while looking for specific signs of MS damage in your central nervous system.^[4]^[7]

Medical History and Physical Examination

Your doctor will begin by taking a detailed medical history, asking about your symptoms, when they started, how long they lasted, and whether they’ve improved or worsened over time. This conversation helps establish whether you’ve had episodes of symptoms separated by periods of relative stability, which is characteristic of relapsing-remitting disease. The healthcare provider will also check how well various body functions are working, including your vision, sense of balance, coordination, reflexes, and muscle strength.^[4]^[10]

A complete neurological exam is essential for diagnosis. During this exam, your doctor tests different aspects of your nervous system function to identify areas where signals from your brain aren’t traveling properly to other parts of your body. This examination helps pinpoint which areas of your central nervous system might be affected.^[10]

Magnetic Resonance Imaging (MRI)

An MRI scan is one of the most important diagnostic tools for multiple sclerosis. This imaging test uses magnets and radio waves to create detailed pictures of your brain and spinal cord. The MRI can reveal areas of damage or scarring, called lesions, where the protective covering around nerves has been attacked by your immune system.^[4]^[10]

For diagnosis purposes, doctors look for lesions in at least two separate areas of your central nervous system that occurred at different points in time. The MRI can show both old lesions from previous attacks and new ones that have developed more recently. Sometimes a special dye containing gadolinium is injected during the scan to highlight areas of active inflammation, which appear as bright spots on the images.^[13]

The beauty of MRI technology is that it can detect disease activity even when you’re not experiencing obvious symptoms. Some relapses are “silent,” meaning they damage the myelin and cause new lesions without producing noticeable symptoms or disability. These silent relapses can be caught on MRI, which is why doctors may recommend periodic scans even when you’re feeling well.^[6]

⚠️ Important

Not every change in symptoms means you’re having a true relapse. Many MS symptoms can fluctuate from day to day as part of the everyday pattern of the disease. Heat, stress, infections, and other factors can temporarily worsen symptoms in what’s called a “pseudo-exacerbation.” To be considered a new relapse, symptoms must last at least 24 hours and occur at least 30 days from the start of the last relapse.^[15]

Spinal Tap (Lumbar Puncture)

A spinal tap, also called a lumbar puncture, involves taking a small sample of the fluid that surrounds your brain and spinal cord. This fluid, called cerebrospinal fluid, is tested in a laboratory to look for signs of immune system activity and inflammation. People with MS often have specific proteins or immune cells in their cerebrospinal fluid that shouldn’t normally be there in such quantities.^[10]

While a spinal tap can provide valuable information, it’s not always necessary for diagnosis, especially if MRI results and other tests already point clearly toward MS. Your doctor will determine whether this test is needed in your specific situation.

Blood Tests

There is no blood test that can definitively diagnose multiple sclerosis. However, blood tests play an important role in the diagnostic process by helping to rule out other conditions that can mimic MS symptoms. Certain diseases can cause symptoms similar to MS, and it’s essential to exclude these possibilities before confirming an MS diagnosis.^[4]^[10]

Your doctor may recommend blood tests to check for conditions such as vitamin deficiencies, infections, or other autoimmune diseases. In some cases, especially for people of Asian or African-American ethnicity, blood tests may be done to exclude conditions like neuromyelitis optica spectrum disorder or MOG-associated disorder, which can have features similar to multiple sclerosis but require different treatments.^[10]

Eye Examinations

Vision problems are often among the earliest symptoms of relapsing multiple sclerosis. Optic neuritis, which is inflammation of the optic nerve, frequently starts with pain in the eye, headache on one side, or blurred vision.^[3] Your healthcare provider may perform or order specialized eye examinations to look for signs of damage in the back of the eye. One such test is called OCT (optical coherence tomography), which can detect changes in the nerve tissue at the back of the eye.^[7]

Meeting Diagnostic Criteria

To receive a formal diagnosis of relapsing-remitting multiple sclerosis, you must meet specific criteria. This means having evidence of damage in at least two separate areas of your central nervous system, with these areas being affected at different points in time. Additionally, all other possible diagnoses must be ruled out through the testing process.^[3]

The diagnosis can be made based on clinical symptoms alone if you’ve had two or more distinct attacks affecting different parts of your nervous system. It can also be made based on a combination of clinical symptoms and MRI findings that show both old and new lesions. Sometimes people experience a first episode of neurologic symptoms, called clinically isolated syndrome (CIS), which may or may not progress to a full MS diagnosis.^[5]^[13]

Diagnostics for Clinical Trial Qualification

When researchers study new treatments for multiple sclerosis in clinical trials, they need to use standardized tests and criteria to determine who can participate. These qualification criteria ensure that the right patients are enrolled in studies and that results can be accurately measured and compared.

MRI Monitoring in Clinical Trials

MRI scans are extensively used in clinical trials to track disease activity and measure how well a treatment is working. Researchers look at whether new lesions appear, whether existing lesions are enlarging, and whether there are signs of active inflammation. MRI provides objective evidence of disease activity that doesn’t rely on how someone is feeling on a particular day.^[13]

Different types of lesions visible on MRI have specific meanings in the context of clinical trials. Gadolinium-enhanced lesions, which show up as bright spots when a special dye is used, indicate areas of active inflammation. These lesions typically remain visible for about four to six weeks, so they represent recent disease activity. Other types of lesions on MRI include those that appear on certain types of scans as bright areas or dark areas, each providing different information about disease progression.^[13]

Relapse Documentation

For someone to qualify for many clinical trials studying relapsing multiple sclerosis, they must have a documented history of relapses. A relapse, in clinical trial terms, is defined as the appearance of new neurological symptoms or the worsening of existing symptoms that lasts at least 24 hours and occurs in the absence of fever or infection.^[9]

Researchers need clear documentation of when relapses occurred, how long they lasted, which symptoms were involved, and how they affected the person’s ability to function. This information helps determine whether someone has the type and level of disease activity that the study is designed to evaluate.

Disability Assessment

Clinical trials often use standardized scales to measure disability levels in people with MS. These assessments evaluate how well someone can perform various physical and cognitive tasks. The information gathered helps researchers understand the baseline condition of study participants and track any changes that occur during the trial.

Participants may undergo tests of walking ability, hand coordination, vision, thinking skills, and overall physical function. These baseline measurements are compared to later assessments to determine whether a treatment is helping to prevent worsening of symptoms or disability.

Blood and Other Laboratory Tests

Before enrolling in a clinical trial, potential participants typically undergo comprehensive laboratory testing. These tests serve multiple purposes: confirming the MS diagnosis, ruling out other conditions that would exclude someone from the study, and establishing baseline health markers that will be monitored throughout the trial for safety purposes.

Blood tests may check liver function, kidney function, blood cell counts, immune system markers, and other factors. These results help ensure that participants are healthy enough to safely receive the experimental treatment being studied. Some trials may also collect and store blood samples for future research into biomarkers, which are measurable indicators of disease activity or treatment response.^[9]

Exclusion of Other Conditions

Just as in routine clinical diagnosis, clinical trials require that other conditions mimicking MS be ruled out. This may involve additional blood tests beyond standard diagnostic panels. For example, tests may be performed to exclude neuromyelitis optica spectrum disorder or MOG-associated disorder, conditions that can look similar to MS but respond differently to treatments.^[10]

⚠️ Important

If you’re interested in participating in a clinical trial, your healthcare provider can help determine whether you meet eligibility criteria. Each trial has specific requirements regarding disease type, disease duration, relapse history, current treatments, and other factors. Being open about your complete medical history and current health status is essential for safe participation in research studies.

Prognosis and Survival Rate

Prognosis

The outlook for people with relapsing multiple sclerosis has improved dramatically in recent years, largely due to advances in treatment. When disease-modifying therapies are started early and used consistently, many people can experience significant control over their disease progression. Research shows that newer treatments can prevent new lesions from forming in about 99% of patients, representing a major advance in managing the condition.^[19] However, without treatment, roughly one-third of people with MS may experience significant physical disability within 20 to 25 years of their first symptoms appearing.^[3] Several factors can influence how the disease progresses for an individual person. These include how quickly treatment is started after diagnosis, how well someone adheres to their prescribed therapy, the frequency and severity of relapses, and lifestyle factors such as smoking, diet, exercise, and stress management. People who are overweight tend to have more active disease and faster progression, while those who maintain a healthy lifestyle often experience better outcomes.^[10]^[16] Most people initially diagnosed with relapsing-remitting MS may eventually transition to a form called secondary progressive MS, where the disease tends to progress more steadily rather than in distinct relapses and remissions. This transition typically occurs after several decades of living with the disease, though not everyone experiences this change.^[5]

Survival Rate

Multiple sclerosis is not considered a fatal disease, and people with MS can live long, fulfilling lives. A study published by the American Academy of Neurology found that people with MS lived to an average age of 75.9 years, compared to 83.4 years for those without the condition. Importantly, the gap in life expectancy has narrowed considerably over the past few decades thanks to better treatments and earlier diagnosis.^[19] The most important factor affecting long-term survival is managing both the MS itself and any other health conditions that may develop. People with MS may be more vulnerable to certain complications such as heart disease, pneumonia, pressure ulcers, and urinary tract infections. By maintaining overall health through proper medical care, healthy lifestyle choices, and adherence to prescribed treatments, people with relapsing MS can optimize their life expectancy and quality of life.^[19]