Depression & Functional Assessment Resources

The following links provide clinically relevant tools for the assessment of patients with depression by health care professionals


  • Patient Health Questionnaire (PHQ-9)

    The PHQ-9 is a self-administered depression tool that scores each of the 9 DSM-IV criteria on a scale from "0" (not at all) to "3" (nearly every day). It can be used as a diagnostic measure as well as to assess depression severity and monitor treatment response.15

  • Hamilton Rating Scale for Depression (HAM-D)

    The HAM-D is an observer-rated scale that assesses symptom severity in patients diagnosed with depression. It was originally published with 21 items, but typically only the first 17 are scored. Each symptom is rated for presence/severity. Most items are 0-4.16

  • Clinical Global Impressions—Severity (CGI-S)

    The CGI-S is often used in clinical studies before and during treatment to measure the clinician's impression of a patient's illness severity. The clinician is asked to rate how mentally ill a patient is on a scale from 1 (not ill at all) to 7 (among the most extremely ill).16

  • Clinical Global Impressions—Improvement (CGI-I)

    The CGI-I is often used in clinical studies to measure the clinician's impression of a patient's improvement or worsening from baseline (the beginning of the study). The clinician is asked to rate how much the patient's condition has changed on a scale from 1 (very much improved) to 7 (very much worse).16



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