How Long Does a Diagnostic Appointment Take? 

The ADHD diagnostic appointment length can vary depending on the healthcare provider and the complexity of the case but typically ranges from 60 to 120 minutes. In some instances, the evaluation process may be spread across multiple sessions to ensure a thorough and accurate diagnosis. 

During a standard diagnostic appointment, the clinician, usually a psychologist, psychiatrist, or trained GP will conduct a detailed interview, asking about your medical history, current symptoms, and how these symptoms impact your daily life. They may also use standardised questionnaires or screening tools to assess attention, impulsivity, and hyperactivity. In some cases, additional information from family members, teachers, or partners is also gathered to provide a fuller picture. 

What to Expect During the Appointment 

Here’s how the time required, and ADHD diagnostic appointment length is typically spent: 

Clinical Interview (30–60 minutes)  

A deep dive into your personal history, including school performance, work habits, and behaviour patterns. This is crucial to rule out other conditions. 

Assessment Tools (20–40 minutes)  

Completion of questionnaires or rating scales that measure the severity and frequency of ADHD symptoms. 

Review and Discussion (10–20 minutes)  

The clinician may discuss preliminary impressions and outline next steps, such as further evaluation or beginning a treatment plan. 

In conclusion, some diagnostic processes, especially in specialist settings, may include cognitive testing or follow-up visits, which can extend the overall timeline. 

Visit providers like ADHD Certify for personal consultations and expert guidance tailored to your unique situation. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Signs, Symptoms, and Self-identification of ADHD.