http://www.cdc.gov/cfs/cfsdiagnosis.htm#evaluation
National Center for Infectious Diseases, Centers for Disease Control and Prevention
This summary is the procedure recommended by a panel of chronic fatigue syndrome (CFS) experts for clinically evaluating and classifying chronic fatigue. It is designed to help you better understand the process that your physician used (or will use) to reach (or exclude) a diagnosis of chronic fatigue syndrome.