Abstract:
Of 11 immunological tests done on chronic fatigue syndrome patients and on fatigued controls, 3 tests (protein A binding, Raji cell, or C3 or C4 [deviant values in either complement component were counted as positive]) with deviant results discriminated best among the groups. Other tests, including immunoglobulin G subclasses, complement component CH50, interleukin-2, and anticardiolipin antibodies, did not discriminate well among the groups.
Source: Natelson BH, Ellis SP, Braonáin PJ, DeLuca J, Tapp WN. Frequency of deviant immunological test values in chronic fatigue syndrome patients. Clin Diagn Lab Immunol. 1995 Mar;2(2):238-40. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC170136/
You can read the full article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC170136/pdf/020238.pdf