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Diagnostic Criteria &
Differential Diagnosis

Canadian Expert Consensus Panel Clinical Case Definition for ME/CFS
published in the Journal of Chronic Fatigue Syndrome, Vol. 11 (1) 2003

  • The following links describe the diagnostic criteria and differential diagnosis of M.E. 
    • (note: differential diagnosis means illnesses to rule out)
  • You should know that there are several definitions to describe M.E. and they are continually being modified.  In addition, the definitions for CFS and CFIDS are also different than that of M.E.
  • Current discussions continue regarding a definition for research purposes and a different, less rigid definition for clinical purposes.

chronic fatigue is NOT chronic fatigue syndrome or M.E.!
chronic fatigue syndrome or M.E. is NOT just chronic fatigue!

A diagnosis for any medical condition must be
made by a qualified medical professional.

The Waterloo Wellington
Myalgic Encephalomyelitis Association
assumes no liability for the diagnosis of any medical condition.

Begin with the following link and then move down the list to the
others for more information on obtaining a correct diagnosis.

What illnesses could cause fatigue?
from holistic-online.com

1994 Revised Case Definition
of Chronic Fatigue Syndrome (CFS)
and The Differential Diagnosis
in Patients Presenting with CFS:
from holistic-online.com

This link provides "... the text of definitions
descriptions of M.E. as published in six papers
since the name was coined in 1956."
(the most recent was 1994, near the bottom of the page)

Definition of CFS
from the USA CDC

Overlapping Disorders:
Chronic Fatigue Syndrome, Fibromyalgia Syndrome,
Multiple Chemical Sensitivity & Gulf War Syndrome.
by MCS Referral & Resources

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