How is ADHD diagnosed?

ADHD cannot be self-diagnosed

Online checklists and symptom lists can help you recognise patterns, but they are not enough for a diagnosis. The National Institute of Mental Health explains that diagnosis involves a qualified professional reviewing symptoms, history, and how daily life is affected.

Who can diagnose ADHD?

ADHD is typically diagnosed by:

• Psychiatrists (can also prescribe medication)
• Clinical psychologists (assessment and diagnosis, usually refer for medication)
• Paediatricians or specialist physicians in some regions
• GPs in some countries, or with specialist training

A GP is usually the first step and can refer you to the right specialist.

What to bring to an ADHD assessment

Clear examples are more useful than a perfect explanation.

• Repeated patterns with focus, time, memory, impulsivity, or organisation
• Examples from childhood if you have them, such as school reports or family observations
• Current examples from work, study, home, relationships, or medication routines
• Sleep, mood, anxiety, substance use, physical health, or side-effect notes that may matter
• Questions about treatment, medication, side effects, follow-up, and practical support

The diagnosis process, step by step

The diagnosis process is not based on one test. It is a combination of assessments:

1. Initial consultation

You discuss your symptoms, concerns, and why you think you may have ADHD. This includes a general history of your mental health, development, and daily functioning.

2. Detailed history

A key part of diagnosis is understanding long-term patterns. This may include reviewing school reports, asking a family member, or exploring childhood experiences. ADHD symptoms must have been present over time, not just recently.

3. Symptom assessment

Clinicians assess symptoms against established diagnostic criteria. This includes DSM-5 or ICD-11 criteria. Symptoms must be present in multiple settings and cause significant impairment.

4. Questionnaires and rating scales

You may be asked to complete structured questionnaires. Sometimes input from a partner, parent, or colleague is included. These help build a clearer picture of behaviour patterns.

5. Ruling out other causes

Clinicians consider whether symptoms could be explained by other factors, such as anxiety, depression, sleep disorders, thyroid issues, or trauma. This step ensures the diagnosis is accurate.

6. Diagnosis and next steps

If criteria are met, the clinician may diagnose ADHD and discuss next steps. This can include medication, referrals, therapy, or workplace accommodations.

Diagnostic criteria simplified

To be diagnosed with ADHD, symptoms generally need to:

• Have been present since before age 12
• Occur in more than one setting (e.g. work and home)
• Cause clear impairment in daily functioning
• Not be better explained by another condition

How long does the process take?

The timeline varies. In many cases, the process takes a few weeks to several months, depending on availability, waiting lists, and complexity. Private assessment is typically faster than public healthcare routes.

What happens after diagnosis?

If ADHD is diagnosed, your clinician may discuss treatment, follow-up, practical support, medication options, therapy, coaching, workplace adjustments, or daily systems. The right plan depends on your health history and local care pathway.

Where medication notes fit in

If medication becomes part of your plan, dose history, skipped-dose notes, side effects, sleep, appetite, focus changes, and refill issues can be useful at reviews. The NICE ADHD guideline includes medication benefits, adverse effects, missed doses, sleep, and daily-life effects as review topics.

Where Pillr fits

Pillr is an ADHD medication reminder and dose tracking app for iPhone. It can help you set reminders, log taken or skipped doses, review medication history, and keep appointment notes.

Pillr does not diagnose ADHD, choose treatment, change medication timing, or replace professional care.