Despite the confusion in the traditional medical establishment regarding the classification and treatment of MCS, MCS has achieved credibility in workers compensation claims, tort liability, and regulatory actions. The pragmatic determination of MCS includes four elements: (1) the syndrome is acquired after a documentable environmental exposure that may have caused objective evidence of health effects; (2) the symptoms are referable to multiple organ systems and vary predictably in response to environmental stimuli; (3) the symptoms occur in relation to measurable levels of chemicals, but the levels are below those known to harm health; and (4) no objective evidence of organ damage can be found.