McMaster University

Demystifying Medicine
Seminar Series

How is ALS diagnosed?

Please complete our feedback form

This video describes what ALS is and the requirements that must be met when diagnosing ALS. It lists the symptoms and signs of ALS as well as the different tests conducted to determine an ALS diagnosis.

— Video by Aagman Walia, Afraah Shirin, Jayson Subaskaran, and Sharangi Vasavan


  • National Institute of Neurological Disorders and Stroke (2018). Amyotrophic Lateral Sclerosis (ALS) Fact Sheet.
  • Carvalho, M. D., & Swash, M. (2009). Awaji diagnostic algorithm increases sensitivity of El Escorial criteria for ALS diagnosis. Amyotrophic Lateral Sclerosis, 10(1), 53-57.
  • Wijesekera, L. C., & Leigh, P. N. Amyotrophic lateral sclerosis. Orphanet Journal of Rare Diseases. 2009 Feb 3;4:3. doi: 10.1186/1750-1172-4-3.
  • ALS Society of Canada. What is ALS? Retrieved Nov 18, 2018.