How is myasthenia gravis diagnosed by healthcare professionals?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Myasthenia gravis is diagnosed through a combination of tests, including blood tests to detect specific antibodies (such as anti-AChR or anti-MuSK), nerve conduction studies like repetitive nerve stimulation and single-fiber electromyography (EMG), and a thorough physical exam assessing muscle weakness and fatigability. Imaging, such as a CT or MRI of the chest, may also be used to check for thymus abnormalities.

Because myasthenia gravis shares symptoms with many other neurological and autoimmune conditions, identifying the cause of muscle weakness early is critical to getting the right treatment. If you're experiencing unexplained fatigue, drooping eyelids, double vision, or difficulty swallowing, don't wait to find answers. Take a free, instant, online symptom check to better understand your symptoms and confidently navigate your next steps.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Discover if my symptoms suggest myasthenia gravis Find out what may be causing weakness Learn whether my symptoms need urgent care See OTC options for muscle weakness Find a doctor for myasthenia gravis Understand medically valid home remedies for weakness Check if symptoms point to myasthenia gravis

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Explanation

Myasthenia gravis is diagnosed by healthcare professionals through a combination of tests and evaluations.

1. Medical History and Physical Exam:

Doctors start by asking about symptoms like muscle weakness and fatigue. If you're experiencing concerning symptoms, you can begin by using a free symptom checker to help identify what might be causing them. Doctors will also check for any drooping of the eyelids or other muscle problems during your visit.

2. Blood Tests:

Blood tests are used to look for antibodies that interfere with how nerves talk to muscles. These antibodies are a common cause of myasthenia gravis.

3. Nerve Tests:

Special tests called electromyography (EMG) and nerve conduction studies help doctors see how well nerves send signals to muscles. These tests can show if there is a problem with nerve-muscle communication.

4. Imaging Tests:

Sometimes, doctors use imaging tests like CT or MRI scans to check for issues in the chest area, such as a tumor in the thymus gland, which can be related to myasthenia gravis.

These steps help doctors confirm if someone has myasthenia gravis and decide the best way to help them feel better.

(References)

Rousseff RT. (2021). Diagnosis of Myasthenia Gravis. Journal of clinical medicine, 33923771.
Meriggioli MN, & Sanders DB. (2004). Myasthenia gravis: diagnosis. Seminars in neurology, 15229790.
Pasnoor M, Dimachkie MM, Farmakidis C, & Barohn RJ. (2018). Diagnosis of Myasthenia Gravis. Neurologic clinics, 29655449.

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