Adult ADHD Self-Report Scale (ASRS-v1.1)
Also known as: ASRS-v1.1, ASRS, Kessler Scale
The ASRS-v1.1 is an 18-item self-report screening scale for attention-deficit/hyperactivity disorder in adults, developed by Kessler and colleagues in 2005 under World Health Organization auspices. A brief 6-item version provides rapid initial screening. The scale has become standard first-step screening in primary care, occupational medicine, and mental health settings, particularly valuable for identifying undiagnosed ADHD in working-age adults.
Key highlights
- Brevity and speed: 6-item version screens in <2 minutes; 18-item version in ~5 minutes; easily integrated into routine clinical workflow
- World Health Organization development: scale derived from international ADHD experts and validated across 17+ countries; strong epidemiological foundation
- High specificity: 99% specificity on 6-item screener means positive results highly likely true positives, reducing unnecessary comprehensive evaluations
- Dimensional scoring: captures ADHD symptom severity and functional impairment; responsive to change with treatment
- Free and accessible: publicly available; no licensing fees; widely translated into 25+ languages
Intuition
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How it works
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When to use it
Primary use: rapid screening for ADHD in primary care, occupational health, and mental health initial appointments. Case-finding in adults with presenting complaints of time management, organization, or focus difficulties. Identification of undiagnosed ADHD in those currently evaluated for mood or anxiety disorders (ADHD and depression/anxiety frequently co-occur). Not appropriate as standalone diagnostic tool; always pair with clinical evaluation.
Strengths & limitations
- Brevity and speed: 6-item version screens in <2 minutes; 18-item version in ~5 minutes; easily integrated into routine clinical workflow
- World Health Organization development: scale derived from international ADHD experts and validated across 17+ countries; strong epidemiological foundation
- High specificity: 99% specificity on 6-item screener means positive results highly likely true positives, reducing unnecessary comprehensive evaluations
- Dimensional scoring: captures ADHD symptom severity and functional impairment; responsive to change with treatment
- Free and accessible: publicly available; no licensing fees; widely translated into 25+ languages
- Screening tool only: ASRS cannot diagnose ADHD; 70% sensitivity means 30% of actual ADHD cases missed by screening (false negatives)
- Self-report bias: subject to minimization (especially in females, who may internalize symptoms) and false positives from misattribution of mood/anxiety symptoms to inattention
- Limited impairment assessment: does not comprehensively measure functional impact across work, relationships, health; additional functional assessment needed
- Requires validation interviews: all positive screens must be followed by structured clinical interview and comprehensive assessment; screens alone insufficient
- Cultural variation: symptom endorsement patterns vary across cultures; cutoffs derived primarily from US samples may need adjustment in other populations
Common pitfalls
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Frequently asked
Is a score of 4 on the 6-item screener definitive for ADHD diagnosis?
No. A score ≥4 indicates ~70% probability that the person has ADHD and warrants comprehensive diagnostic evaluation, not a diagnosis itself. Comprehensive evaluation includes clinical interview, confirmation of childhood symptom onset, functional impairment across multiple domains, and exclusion of alternative causes. A positive screen is a starting point, not an endpoint.
Why might someone with ADHD score below 4 on the screener?
ASRS sensitivity is ~70%, meaning ~30% of individuals with diagnosed ADHD score below the cutoff. This particularly affects high-functioning adults whose organizational strategies mask ADHD, women whose symptoms are internalized as anxiety, and individuals who have developed compensatory coping mechanisms. Clinical suspicion should prompt full evaluation regardless of screening score.
Can depression or anxiety produce a high ASRS score?
Yes. Depression and anxiety cause concentration difficulties, procrastination, and restlessness mimicking ADHD. ASRS does not distinguish ADHD-specific inattention from depression/anxiety-related concentration loss. Comprehensive evaluation must assess mood and anxiety symptoms to clarify whether apparent inattention is ADHD, comorbid mood/anxiety, or both.
Is the 18-item version better than the 6-item screener?
The 6-item version is optimized for screening speed and high specificity. The 18-item version provides more detailed symptom and impairment information useful in comprehensive evaluation settings but is less suitable for rapid triage. Use 6-item version for initial screening; use 18-item version if screening positive or in detailed assessment.
Is ASRS available free for clinical use?
Yes. The ASRS is public domain and freely available for clinical and research use without licensing fees. It appears in the DSM-5 and WHO publications. Reproduce without permission for non-commercial use. Cite Kessler et al. (2005) original publication.
Sources
- 1.Kessler, R. C., Adler, L., Ames, M., et al. (2005). The World Health Organization Adult ADHD Self-Report Scale (ASRS): a short screening scale and symptom impact measure. Psychological Medicine, 35(2), 245–256.
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Cite this page
ScholarGate. (2026, June 3). Adult ADHD Self-Report Scale. ScholarGate. https://scholargate.app/clinical-psychology/adult-adhd-self-report-scale