Hidden ADHD: study reveals how many adults are undiagnosed

NCT ID NCT04943796

Completed Knowledge-focused Sponsor: Takeda Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This completed study looked at 224 adults who already had at least one psychiatric condition to see how many also had undiagnosed ADHD. Researchers measured how often ADHD was missed and tracked quality of life in those diagnosed. The goal is to highlight the need for better detection of ADHD in adults with other mental health disorders.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

What this could lead to: If successful, this study could raise awareness about undiagnosed ADHD in adults with other mental health conditions, potentially leading to better screening practices.
What could go wrong: This is an observational study with no treatment being tested, so it cannot prove cause and effect. Results may not apply to all populations or settings.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

attention deficit hyperactivity disorder, inattentive type attention deficit-hyperactivity disorder psychiatric disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

ATTENTION-DEFICIT/HYPERACTIVITY DISORDER (ADHD)

Contacts and locations

Locations

Asklepios Klinikum Hamburg

Hamburg, 21075, Germany
Charité - Universitätsmedizin Berlin

Berlin, 10117, Germany
Clínica Dr. Quintero

Madrid, 28002, Spain
Cumbria Northumb, Tyne & Wear FT, Adult Psychiatry Dept

Newcastle upon Tyne, NE3 3XT, United Kingdom
Hopital de Psychiatrie de Trois-Rivières, Pavillon St-Joseph

Trois-Rivières, Quebec, G9A 5Z9, Canada
Hospital Vall d'Hebron

Barcelona, 08035, Spain
Hs. Infanta Elena

Madrid, 28342, Spain
Klinik und Poliklinik für Psychiatrie und Psychoterapie

Bonn, 53127, Germany
Pacific Coast Recovery Care

Burnaby, British Columbia, V3N3N4, Canada
Psykiatrisk klinik Umeå

Umeå, 907 37, Sweden
Regina Mental Wellness Clinic

Regina, Saskatchewan, S4P0W6, Canada
Tees Esk and Wear Valley foundation

York, YO31 8TA, United Kingdom
University Hospitals of Geneva

Geneva, 1205, Switzerland
Universitätsklinikum Frankfurt am Main

Frankfurt am Main, 60596, Germany

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