the Mood Disorder Questionnaire (MDQ)

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Hirschfeld, et al, conducted a large-scale community screening for DSM-IV bipolar I and II disorders. The Mood Disorder Questionnaire (MDQ), a validated screening tool for bipolar I and II disorders, was sent to a sample of > 125,000 adults in the United States.
Of the adults identified as screening positive for bipolar I and II disorders, only 20% had previously received a diagnosis of bipolar disorder. 31% had received a diagnosis of unipolar depression.
Almost 50% of respondents reported receiving no diagnosis of either unipolar depression or bipolar disorder"/.../