Getting an ALS diagnosis starts with a neurologist

You cannot diagnose ALS yourself or get it confirmed by a primary care doctor alone. A neurologist—a doctor who specializes in nervous system disorders—must examine you, review your medical history, and order specific tests. If your regular doctor suspects ALS based on your symptoms, they will refer you to a neurologist. If you do not have a referral yet, you can call neurology departments at major hospitals or academic medical centers in your area and ask for an appointment, though wait times vary widely.

The neurologist will ask detailed questions about when your symptoms started, which muscles are affected, and how quickly things have changed. They will perform a physical exam testing your strength, reflexes, and muscle tone. This exam alone cannot confirm ALS—the diagnosis requires additional testing to rule out other conditions that look similar.

Key Takeaways

  • A neurologist performs the physical exam and orders tests; no single test confirms ALS, so diagnosis relies on a pattern of findings across multiple tests.
  • Electromyography (EMG) and nerve conduction studies are the most important tests and often take 30 to 60 minutes to complete.
  • MRI of the spine and brain rules out other conditions that cause similar symptoms, such as tumors or compressed nerves.
  • Blood tests and sometimes a spinal tap help eliminate other diagnoses before ALS is confirmed.
  • Diagnosis can take weeks to months because the neurologist must see a pattern of nerve damage over time and rule out mimics.

Electromyography (EMG) and nerve conduction studies

The electromyography (EMG) test measures the electrical activity in your muscles. Small needles are inserted into muscles to record their activity at rest and during contraction. This test shows whether muscle damage is happening and helps the neurologist understand the pattern of weakness. The nerve conduction study measures how fast electrical signals travel along your nerves. Together, these tests take 30 to 60 minutes and are uncomfortable but not dangerous.

These tests are critical because they show a specific pattern in ALS: muscles are damaged, but the nerves themselves are working. Other conditions show different patterns. The neurologist may repeat EMG testing weeks or months later to confirm that the damage is spreading, because ALS is progressive and the pattern changes over time.

MRI and blood tests to rule out other conditions

An MRI of the cervical spine (neck) and sometimes the brain takes images to check for tumors, compressed nerves, or other structural problems that could cause similar symptoms. This test is painless but requires you to lie still inside a machine for 30 to 45 minutes. If you have metal implants or are claustrophobic, tell the neurologist before scheduling.

Blood tests check for other conditions that mimic ALS, such as Lyme disease, thyroid problems, or vitamin deficiencies. A spinal tap (lumbar puncture) may be ordered to examine cerebrospinal fluid and rule out infections or inflammatory diseases. The spinal tap takes 15 to 20 minutes and carries a small risk of headache afterward, but it provides important information.

Why diagnosis takes time

ALS cannot be confirmed by a single test. The neurologist must see a pattern: upper motor neuron signs (like increased reflexes or stiffness) and lower motor neuron signs (like muscle weakness or twitching) in at least two body regions, plus evidence from EMG that muscles are degenerating. Early in the disease, this pattern may not be clear yet.

If your first EMG is inconclusive, the neurologist will schedule a repeat test weeks later. If your symptoms are only in one area of your body, they may wait to see whether weakness spreads before confirming the diagnosis. This delay is frustrating, but it also protects against misdiagnosis—some conditions that look like ALS early on turn out to be treatable.

What to bring to your neurologist appointment

Bring a list of all your symptoms, when they started, and how they have progressed. Write down which muscles feel weak or stiff, whether you have noticed twitching, and whether swallowing or speech has changed. Bring any imaging results (X-rays, MRIs, CT scans) from other doctors. Bring a list of all medications and supplements you take.

If possible, bring someone with you to take notes. Neurologist appointments involve a lot of information, and having a second person helps you remember what was said and what tests are scheduled next. Ask the neurologist for a written summary of findings and next steps before you leave.

After diagnosis: what comes next

Once ALS is confirmed, your neurologist will discuss treatment options. Two medications—riluzole and edaravone—may slow disease progression slightly. Your neurologist will also refer you to an ALS clinic or multidisciplinary team that includes physical therapists, speech therapists, respiratory specialists, and social workers. These teams coordinate care as your needs change.

You will also be referred to genetic counseling if your family has a history of ALS, and to a pulmonologist (lung specialist) to monitor breathing. Many people benefit from connecting with an ALS support organization, which can provide information about managing symptoms, financial resources, and clinical trials.

Finding a neurologist if you do not have one

If your primary care doctor has not referred you, call the neurology department at the nearest academic medical center or major hospital. Tell them you have symptoms concerning for ALS and ask how to schedule an appointment. Some centers have dedicated ALS clinics with shorter wait times than general neurology.

If you have insurance, check your plan's website for in-network neurologists. If you do not have insurance, ask the hospital's financial counselor about sliding-scale fees or payment plans. Some ALS organizations maintain lists of neurologists in your region and can help you find one.

Frequently Asked Questions

Can my primary care doctor diagnose ALS?

No. A neurologist must perform the exam and order the tests. Your primary care doctor can recognize symptoms that suggest ALS and refer you, but only a neurologist can work through the diagnostic process and confirm or rule out the diagnosis.

How long does it take to get an ALS diagnosis?

It varies. Some people receive a diagnosis within weeks if the pattern is clear and tests are conclusive. Others wait months, especially if early tests are inconclusive and the neurologist needs to repeat them to see whether the pattern has changed. This delay is normal and does not mean something is wrong with your care.

What if the first neurologist is unsure?

Ask for a referral to an ALS specialist or an academic medical center with an ALS clinic. A second opinion from a specialist experienced in ALS diagnosis can clarify uncertain cases. Some people benefit from seeing a neurologist at a major research center.

Do I need to do anything to prepare for EMG testing?

Wear loose, comfortable clothing so the neurologist can access your arms and legs easily. Do not apply lotion or oil to your skin the day of the test. Eat normally and take your regular medications. The test is uncomfortable but brief, and you can return to normal activities immediately afterward.

What happens if tests come back normal but I still have symptoms?

The neurologist may repeat testing in a few weeks or months, because early ALS can show subtle findings that become clearer over time. Other conditions may also cause similar symptoms. Your neurologist will work with you to either confirm ALS or identify what is causing your symptoms.