The American Psychiatric Associations manual of criteria and codes for psychiatric diagnoses is an essential reference for all mental health and medical professionals. The Fourth Edition with new text revisions offers increased clarity, specificity, and clinical utility. It also places greater emphasis on the influence of several factors--culture, ethnicity, substance use, medical conditions, and development across the life span--on psychiatric assessment and diagnosis.

DSM-IV-TR adds new information on associated features for many disorders, revised diagnostic criteria for several disorders, and updated material on prevalence, course, familial patterns, and gender/age/culture.