
There's no single test to confirm a diagnosis of chronic fatigue syndrome. A variety of medical tests are done to rule out other health problems that have similar symptoms.
CFS and Myalgic Encephalomyelitis (ME)
Some people believe that CFS and ME are two separate conditions while others believe that the two conditions are the same but symptoms are different. Myalgic means muscle aches or pains and Encephalomyelitis is inflammation of the brain and spinal cord.
When fatigue is the main symptom and there is no evidence of imflammation, it is called CFS.
A doctor will usually diagnose it after evaluating your symptoms. Some tests are usually done to rule out other causes of your tiredness (fatigue) or other symptoms. Symptoms should have lasted for at least four months in adults and three months in children and young adults.