Usually, all blood tests, neurophysiology, and MRI scans are normal. Variable abnormalities of the white blood cells and other tests of immune function have been reported, but there is no consistent abnormality in CFS. A very few patients with CFS have an abnormal MRI: some patients with MS have fatigue as a prominent symptom and it is possible that CFS is occasionally the first manifestation of MS.
CFS / ME
Is there a test for CFS?