The diagnosis of ALS is difficult. Extensive testing is required, most often in attempts to prove that a person does not have ALS. Besides the doctor performing both an interview and examination of the person with suspected ALS, patients must undergo:

  • An electromyogram (EMG)
  • Laboratory (blood) testing
  • Either magnetic resonance imaging (MRI) or computerized tomography (CT) scans
  • Possible lumbar puncture
  • Possible muscle/nerve biopsy