How Is Friedreich Ataxia Diagnosed? Imaging Scans, Genetic Testing, and More

If you or your loved one has symptoms like trouble with balance, slurred speech, or muscle weakness, a healthcare provider may start testing for Friedreich ataxia (sometimes abbreviated FA or FRDA).

The process of getting a diagnosis can feel confusing and overwhelming. It’s OK to ask questions like: What tests are needed? How long will they take?

This guide explains the steps to take toward a Friedreich ataxia diagnosis, including imaging scans, genetic testing, and other tools. It also explains which tests are used to rule out other conditions and how diagnosis may differ depending on the age when symptoms begin.

Medical History and Physical Exam

The type of doctor who diagnoses Friedreich ataxia is called a neurologist (a doctor who specializes in the nervous system). Diagnosis usually begins with a detailed medical history and neurological (nervous system) exam.

Medical History

At the beginning of your doctor’s visit, the doctor will ask:

• What symptoms are occurring
• When symptoms started
• How quickly symptoms are getting worse
• Whether your family history includes ataxia (problems with balance or coordination of movement) or neurological disease
• Whether you have diabetes or any heart problems

Friedreich ataxia usually begins between ages 10 and 15. However, some people develop symptoms later in life. Late-onset Friedreich ataxia may begin in the 20s, 30s, or even later. Age of onset can affect which tests doctors order and how strongly they suspect Friedreich ataxia.

Neurological Exam

During the exam, the doctor checks:

• Balance and coordination
• Reflexes
• Muscle strength
• Sensation in arms and legs
• Eye movements
• Speech

People with Friedreich ataxia often have reduced or absent reflexes, poor coordination, and loss of the ability to sense vibration in the feet. These may indicate Friedreich ataxia, but they don’t confirm it. More testing is needed.

Genetic Testing

Genetic testing is the only test that can confirm Friedreich ataxia. A neurologist can make a clinical diagnosis of Friedreich ataxia based on your overall history, exam, and other findings, but a diagnosis should always be confirmed with genetic testing.

Friedreich ataxia is caused by mutations (changes) in a gene called FXN. These mutations can impact the production of a protein called frataxin, which is important for healthy nerve and heart cells. Frataxin helps your cells make energy, so changes in FXN can affect energy-hungry tissues, especially the nervous system and heart.

How Genetic Testing Works

A sample is taken and sent to a lab where your DNA is analyzed. The lab analyzes the FXN gene specifically to:

• Count the number of GAA repeats (short DNA sequences in the FXN gene)
• Check for rare mutations

If both copies of the FXN gene show a disease-causing change, the test is positive and Friedreich ataxia is confirmed.

Learn more about how genetics relate to Friedreich ataxia.

Why Genetic Testing Is Essential

While the physical exam, history, and other testing can support the diagnosis, this is the only test that can definitively confirm Friedreich ataxia.

In some cases:

• If symptoms strongly suggest Friedreich ataxia, doctors may order genetic testing early.
• If symptoms are unusual or started later in life, doctors may test for other ataxia genes as well.

There is broad agreement that genetic testing is the only way to establish a diagnosis. Some people with a genetically confirmed diagnosis of Friedreich ataxia may be eligible for disease-specific treatment.

Once Friedreich ataxia is diagnosed, family members can also seek genetic counseling to get a better sense of their carrier status and their risk of developing Friedreich ataxia.

Imaging Scans

Imaging can help your medical team look at the brain and spinal cord. These tests don’t confirm Friedreich ataxia and aren’t necessary to diagnose it, but they can help rule out other diseases with similar symptoms.

MRI

MRI uses strong magnets and radio waves to create detailed images of the brain and spinal cord. Unlike CT or an X-ray, MRI does not use radiation and is a safe test for people of all ages.

In Friedreich ataxia, an MRI scan may show:

• Atrophy (thinning) of the spinal cord
• Mild changes in the cerebellum (the part of your brain that helps with coordination and fine movement)

However, some people with Friedreich ataxia have brains that appear typical on MRI scans, especially early in the disease. That’s why MRI alone cannot diagnose Friedreich ataxia.

Why MRI Is Important

Doctors use MRI to rule out:

• Brain tumors
• Multiple sclerosis
• Stroke
• Structural abnormalities

If MRI findings match Friedreich ataxia patterns and genetic testing confirms FXN mutations, the diagnosis becomes clear.

In younger children with early symptoms, an MRI scan is often done early to rule out other causes. In adults with late-onset symptoms, an MRI scan may help narrow the list of possible ataxias.

Nerve and Muscle Tests

Friedreich ataxia affects the nervous system. Several tests measure how well nerves and muscles are working.

Nerve Conduction Studies

Nerve conduction studies (NCS) may also be done as part of the Friedreich ataxia workup. They measure how fast electrical signals travel through nerves.

Small electrodes are placed on the skin. A mild electrical impulse stimulates the nerves. The test measures how quickly and strongly the nerves respond.

Electromyography

Electromyography (EMG) measures electrical activity in muscles. A thin needle electrode is inserted into a muscle to record activity.

In Friedreich ataxia, EMG may show signs of nerve-related muscle changes.

What These Tests Tell Doctors

These tests:

• Confirm that nerve damage is present
• Help distinguish Friedreich ataxia from muscle diseases
• Help rule out other types of neuropathy (nerve disease)

They support the diagnosis but do not confirm it without genetic testing.

Heart Testing

Friedreich ataxia commonly affects the heart. In fact, in some people with Friedreich ataxia, heart problems may appear before severe neurological symptoms.

Doctors often order the following heart tests.

Electrocardiogram

An electrocardiogram (ECG) records the heart’s electrical activity. Sticky patches are placed on the chest.

In Friedreich ataxia, an ECG may show abnormal heart rhythms or signs of heart muscle thickening.

Echocardiogram

An echocardiogram uses ultrasound to create images of the heart, recording motion and function.

It can show:

• Hypertrophic cardiomyopathy (thickened heart muscle)
• Changes in heart pumping function

Heart testing does not diagnose Friedreich ataxia. However, heart findings may strengthen suspicion and are important for long-term care.

Blood Tests

Blood tests might be performed to check for other causes of ataxia or to look for complications of Friedreich ataxia. These may include:

• Vitamin D levels
• Vitamin E levels
• Blood sugar testing

Low vitamin E can cause symptoms similar to Friedreich ataxia. Thyroid problems and vitamin deficiencies can also affect balance and nerve function.

Doctors use these tests during differential diagnosis (the process of ruling out other conditions) before confirming Friedreich ataxia.

Blood Tests To Rule Out Other Ataxias

There are many types of inherited and acquired ataxias. If genetic testing for FXN is negative, doctors may order broader genetic panels to test for other causes of ataxia.

In people with late-onset symptoms or atypical features, doctors may test for multiple ataxia genes at once.

There is no single required order of testing. Some neurologists start with targeted FXN testing. Others may use broad genetic panels first, especially if symptoms are unclear.

Is There a Standard Diagnostic Path?

Genetic confirmation is the only way to definitively diagnose Friedreich ataxia. However, there is no universal step-by-step protocol that every doctor follows.

Testing may vary based on:

• Age at symptom onset
• Family history
• Access to genetic testing
• Insurance coverage
• Clinical judgment

Moving Forward After Testing

Waiting for results can be stressful. Genetic testing may take several weeks. During that time, it may help to:

• Write down questions for your care team.
• Ask about referrals to specialists.
• Seek genetic counseling.
• Ask how long the process will take.

Understanding how Friedreich ataxia is diagnosed can make the process feel less confusing. Imaging scans, nerve studies, and heart tests provide important clues. Genetic testing of the FXN gene is what confirms the diagnosis.

If you are concerned about symptoms, talk with a neurologist experienced in ataxia or a specialist. Early diagnosis allows for better monitoring, supportive care, and access to treatment options.

Join the Conversation

On MyAtaxiaTeam, people share their experiences with Friedreich ataxia, get advice, and find support from others who understand.

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