18 questions, anonymous, no signup. ASRS-v1.1 scale. This is not a diagnosis.
The ASRS-18 is an 18-question adult questionnaire created by a WHO workgroup with Harvard Medical School. It is a screening tool, not a diagnosis. This site offers it for free, with no signup, and is not a WHO service.
Many adults search for [adult add test](link:quiz) when they feel their inattention is harming their professional life but do not present physical hyperactivity. The ASRS-18 covers both the hyperactive and inattentive profile (popularly known as ADD). Understand ADHD symptoms in adults to better identify your patterns.
Items 1–3 count when the answer is Sometimes, Often, or Very Often. Items 4–6 count only from Often. Four or more of six items is a positive screen, using the rule published by Kessler and colleagues in 2005. That is not an ADHD diagnosis.
The scale is described in Kessler et al., Psychological Medicine (2005), and on the Harvard ASRS page. Scoring details are on our methodology page.
No. The scale was developed by a WHO workgroup with Harvard Medical School. This site is not the WHO, is not affiliated with it, and does not replace a clinical visit.
When 4 or more of the 6 items cross the threshold: Sometimes counts for items 1–3, and only Often or Very Often for items 4–6.
No. It estimates how likely adult symptoms are (age 18+). Only a clinician can make a diagnosis.