The Centers for Disease Control (CDC) describes CFS as a distinct disorder with specific symptoms and physical signs, based on ruling out other possible causes. CFS is diagnosed after excluding other possible causes of<unk> .
A diagnosis of CFS must mainly based on clinical presentation which includes the:
absence of other causes of<unk><unk> ,
at least four CFS-specific symptoms, and
extreme, long-term<unk> 
Therefore, there are no specific<unk>  to confirm the diagnosis of CFS.
Chronic fatigue syndrome laboratory tests
Parkinson's disease physical examination
Myasthenia gravis physical examination
Fibromyalgia physical examination
Alzheimer's disease physical examination
Heat stroke screening
Restless legs syndrome physical examination
Insomnia physical examination