In a recent study published in the journal PLos ONE, a team of researchers reports the development of specific surrogate criteria that allows for the study of fibromyalgia and polysymptomatic distress in the US National Health Interview Survey. Fibromyalgia is a medical diagnosis used to describe the diminished quality of life related to generalized body pains and physical and psychological symptoms that occurs in the absence of a clear pathologic cause. To be diagnosed with fibromyalgia the symptomatic patient needs to seek health care from clinicians that then need to interpret the described symptoms as such. The development of the 2011 modification for survey research of the American College of Rheumatology (ACR) Preliminary Diagnostic Criteria for Fibromyalgia has enabled investigators to approximate both fibromyalgia diagnosis and severity outside of the clinical setting. The modified 2011 criteria, can be used to determine a “calculated prevalence” of fibromyalgia in a given population. In the study entitled “The Prevalence and Characteristics of Fibromyalgia in the 2012 National Health Interview Survey”, Brian Walitt from the National Center for Complementary and Integrative Health, National Institutes of Health, Bethesda in Maryland and colleagues developed and tested surrogate criteria for fibromyalgia in rheumatology practices using variables from the US National Health Interview Survey (NHIS) and the modification (for surveys) of the 2010 American College of Rheumatology (ACR) preliminary fibromyalgia criteria. The researchers applied the surrogate criteria to the 2012 NHIS and identified subjects who had the necessary criteria from symptom data. The NHIS weighted samples of 8,446 persons represented 225.7 million American adults.