<prompt> Answer this question truthfullyWhich laboratory tests are employed for diagnosing chronic fatigue syndrome?  <response>: <reason> 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 fatigue.A diagnosis of CFS must mainly based on clinical presentation which includes the:absence of other causes of chronic fatigue, at least four CFS-specific symptoms, and extreme, long-term fatigueTherefore, there are no specific tests to confirm the diagnosis of CFS. 