How Long Does It Take to Get an ADHD Diagnosis?
Reviewed by Josie Desmarais, PMHNP-BC · Board-Certified Psychiatric-Mental Health Nurse Practitioner · Last updated August 2026
A structured psychiatric evaluation is the fastest route to an accurate adult ADHD diagnosis.
Short answer: A thorough psychiatric evaluation is the foundation of good care. It clarifies your diagnosis and creates a treatment plan tailored to you.
For most adults, getting an ADHD diagnosis takes two to four weeks from the first phone call to a confirmed diagnostic conclusion — and the bulk of that time is calendar wait between appointments, not active testing. The clinical work itself fits inside a single 30-to-60-minute psychiatric evaluation, with TOVA testing adding roughly an hour when clinically indicated. At Trust Psychiatry – Mental Health West Palm Beach in West Palm Beach, the realistic timeline from intake call to documented diagnosis is one to three weeks for telehealth-only evaluations and two to four weeks when in-office TOVA testing is part of the plan.
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Reviewed by · Board-Certified Psychiatric-Mental Health Nurse Practitioner
Josie Desmarais is a board-certified psychiatric-mental health nurse practitioner (PMHNP-BC) at Trust Psychiatry – Mental Health West Palm Beach. She provides psychiatric evaluation and medication management, and helps patients understand how a comprehensive psychiatric evaluation guides mental-health care, through secure telepsychiatry for adults across Florida.