This is a list of the fields of doctoral studies, as used by the National Opinion Research Center (NORC) at the University of Chicago in the United States in its annual Survey of Earned Doctorates, conducted for the National Science Foundation, and other federal agencies, in the United States.These are fields of research-oriented doctoral studies, leading mostly to the awarding of the degrees of Doctor of Philosophy (Ph.D.), and Doctor of Education (Ed.D. or D.Ed.) in the United States. (In the academic year 2008-2009, 93.5% of the 49,562 research-oriented doctorates awarded in the U.S. were Ph.D.s; 5.5% are Ed.D.s.) Studies that lead to professional doctorates, such as Doctor of Medicine (M.D.), Doctor of Osteopathic Medicine (D.O.), and Juris Doctor (J.D.), are not included.