Hidden ADHD: study reveals how many adults are undiagnosed
NCT ID NCT04943796
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.
Disclaimer
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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Asklepios Klinikum Hamburg
Hamburg, 21075, Germany
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Charité - Universitätsmedizin Berlin
Berlin, 10117, Germany
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Clínica Dr. Quintero
Madrid, 28002, Spain
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Cumbria Northumb, Tyne & Wear FT, Adult Psychiatry Dept
Newcastle upon Tyne, NE3 3XT, United Kingdom
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Hopital de Psychiatrie de Trois-Rivières, Pavillon St-Joseph
Trois-Rivières, Quebec, G9A 5Z9, Canada
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Hospital Vall d'Hebron
Barcelona, 08035, Spain
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Hs. Infanta Elena
Madrid, 28342, Spain
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Klinik und Poliklinik für Psychiatrie und Psychoterapie
Bonn, 53127, Germany
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Pacific Coast Recovery Care
Burnaby, British Columbia, V3N3N4, Canada
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Psykiatrisk klinik Umeå
Umeå, 907 37, Sweden
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Regina Mental Wellness Clinic
Regina, Saskatchewan, S4P0W6, Canada
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Tees Esk and Wear Valley foundation
York, YO31 8TA, United Kingdom
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University Hospitals of Geneva
Geneva, 1205, Switzerland
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Universitätsklinikum Frankfurt am Main
Frankfurt am Main, 60596, Germany