ADHD Assessment Truths: Who Can Diagnose, What to Expect & Why It Matters
The Hidden 20%
The 'Three Ps' and Diagnostic Criteria
Shyamal explains painful, persistent, pervasive criteria and how they map onto functional impairment domains.
In part two of Ben’s conversation with Dr Shyamal Mashru, they unpack what actually makes a good ADHD assessment - and why so many people are still waiting, misdiagnosed, or left without answers.
Dr Shyamal, an NHS Consultant Psychiatrist and Medical Lead for Adult ADHD, explains what happens inside a thorough assessment, who is qualified to diagnose ADHD, and why emotional dysregulation is so often overlooked.
Together, they explore NHS vs private pathways, co-occurring conditions like autism and RSD, and why ADHD rarely shows up in neat, textbook ways.
We hope this episode brings clarity to a process that can often feel stressful, and inaccessible. If you’re questioning ADHD, on a waiting list, or trying to understand what good care really looks like, this conversation is for you.
Join us at hidden20.org/donate.
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Host: Ben Branson
Production Manager: Phoebe De Leiburné
Video Editor: James Scriven
Social Media Manager: Charlie Young
Music: Jackson Greenberg
Head of Marketing: Kristen Fuller
00:00 Introduction
01:12 Who Can Diagnose ADHD in the UK?
04:25 ADHD Assessment Options: NHS vs Private Explained
11:20 ADHD Assessments Outside the UK: What’s Different?
13:00 Why ADHD Assessments Are Complex & Often Siloed
20:14 ADHD & Reduced Life Expectancy: What the Research Shows
24:20 What Makes a Good ADHD Assessment?
29:25 ADHD at School vs University: Missed Support
32:50 RSD, Relationships & Emotional Regulation Flags
34:16 ADHD & Daily Life: Hobbies, Money, Sleep
41:02 When ADHD Gets Misdiagnosed - and Why
47:15 Autism + ADHD: What If You Suspect Both?
55:06 The Missing Piece in ADHD Diagnosis: Emotional Dysregulation
59:00 Dr Shyamal’s Green Dot Badge
The Hidden 20% is a charity founded by AuDHD entrepreneur, Ben Branson.
Our mission is simple: To change how the world sees neurodivergence.
No more stigma. No more shame. No more silence.
1 in 5 people are neurodivergent. That’s 1.6 billion of us - yet too many are still excluded, misunderstood, or left without support.
To break the cycle, we amplify voices, challenge myths, and keep showing up. Spotlighting stories, stats and hard truths. Smashing stereotypes through honest voices, creative campaigns and research that can’t be ignored.Every month, over 50,000 people turn to The Hidden 20% to feel safe, seen and to learn about brilliant brains.
With your support, we can reach further, grow louder, and keep fighting for the 1 in 5 who deserve more.
Join us at hidden20.org/donate.
Become a monthly donor.
Be part of our community where great minds think differently.
Brought to you by charity The Hidden 20% #1203348
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Follow & subscribe…
Website: www.hidden20.org
Instagram / TikTok / Youtube / X: @Hidden20charity
Ben Branson @seedlip_ben
Dr Shymal Mashru @harrowhealthcic
Harrow Health offers bespoke NHS community outpatient services across London, plus fast adult ADHD assessment and treatment across England. For more information please visit: https://adhdrighttochoose.com/
If you'd like to support The Hidden 20%, you can buy a "green dot" badge at https://www.hidden20.org/thegreendot/p/badge. All proceeds go to the charity.
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