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The Patient Health Questionnaire-9 (PHQ-9) is a 9-item self-report measure of depression severity. Each item is rated 0-3 (not at all to nearly every day), producing a total score of 0-27. It is the IAPT core depression measure and is administered at every clinical contact.

The Generalised Anxiety Disorder-7 (GAD-7) is a 7-item self-report measure of anxiety severity. Each item is rated 0-3 (not at all to nearly every day), producing a total score of 0-21. It is the IAPT core anxiety measure and is administered at every clinical contact.

The Social Phobia Inventory (SPIN) is a 17-item self-report measure of social anxiety. Each item is rated 0-4, producing a total score of 0-68. Used as the IAPT ADSM for social anxiety disorder.

The PTSD Checklist for DSM-5 (PCL-5) is a 20-item self-report measure assessing the 20 DSM-5 symptoms of PTSD. Each item is rated 0-4, producing a total score of 0-80. Used as the IAPT ADSM for PTSD.

The Panic Disorder Severity Scale (PDSS) is a 7-item measure of panic attack frequency, distress, anticipatory anxiety, avoidance, and functional impairment. Each item is rated 0-4, producing a total score of 0-28. Used as the IAPT ADSM for panic disorder.

The PHQ-15 is a 15-item somatic symptom severity measure. Each item is rated 0-2, producing a total score of 0-30. Used as the IAPT measure for medically unexplained symptoms (MUS).

The Health Anxiety Inventory (Short Week version) is an 18-item measure of health anxiety. Items 1-14 assess health anxiety and items 15-18 assess perceived negative consequences of illness. Each item is rated 0-3, producing a total score of 0-54. Used as the IAPT ADSM for health anxiety.

The Chalder Fatigue Scale is an 11-item measure of fatigue severity. Each item is rated 0-3 using Likert scoring, producing a total score of 0-33. Used as the IAPT measure for CFS/ME presentations.

The DASS-21 is a 21-item measure of depression, anxiety, and stress. Each item is rated 0-3, producing a total score of 0-63. Subscales: Depression (items 3,5,10,13,16,17,21), Anxiety (2,4,7,9,15,19,20), Stress (1,6,8,11,12,14,18). For severity bands, multiply subscale raw scores by 2.

The Impact of Event Scale — Revised (IES-R) is a 22-item measure of post-traumatic stress symptoms. Each item is rated 0-4, producing a total score of 0-88. Subscales: Intrusion, Avoidance, and Hyperarousal.

The Penn State Worry Questionnaire (PSWQ) is a 16-item measure of pathological worry. Each item is rated 1-5, producing a total score of 16-80. Items 1, 3, 8, 10, and 11 are reverse scored. Widely used in GAD assessment.

The Acceptance and Action Questionnaire-II (AAQ-II) is a 7-item measure of psychological inflexibility. Each item is rated 1-7, producing a total score of 7-49. Higher scores indicate greater psychological inflexibility. Used as a process measure in ACT.

The Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS) is a 14-item measure of positive mental wellbeing. Each item is rated 1-5, producing a total score of 14-70. Higher scores indicate better wellbeing. Population mean approximately 51 (SD 9).