There is no single laboratory test that can diagnose ME/CFS. Patients have consistent biological abnormalities demonstrated in research settings. Many specialist physicians use these tests to aid in forming a diagnosis, although the diagnosis is at present most frequently made by excluding other conditions that cause similar symptoms and by using one of several diagnostic criteria. Due to lack of education and awareness about ME/CFS, many patients are undiagnosed, misdiagnosed with other conditions, or told that their severe disabilities are imagined.
SOURCE: Open Medicine Foundation
Over the years different criteria for diagnosing ME/CFS have been developed for different purposes. Herewith information on the International Consensus Criteria with a summary of other types of criteria, their requirements and purposes.