Is Clinician Subjectivity a Factor in ADHD Over/Underdiagnosis?

PostedOctober 8, 2025

UpdatedOctober 8, 2025

ByMy Patient Advice

Author: Avery Lombardi, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, clinician subjectivity in ADHD diagnosis plays a significant role in both over- and underdiagnosis. While diagnostic manuals like the DSM-5 offer structured criteria, real-world diagnoses often hinge on a professional’s interpretation of symptoms, context, and patient reports. This professional judgment is essential but it also opens the door to diagnostic bias and inconsistency.

Unlike conditions with clear-cut biological markers, ADHD relies heavily on behavioural observation and self-reported experiences. Two clinicians may assess the same individual and reach different conclusions based on how they interpret behaviours like restlessness, disorganisation, or inattentiveness. This variability contributes to both misdiagnosis and missed diagnoses.

How Subjectivity Influences ADHD Outcomes

Here’s how clinician subjectivity in ADHD diagnosis affects ADHD identification:

Diagnostic bias

A clinician’s personal experience, training, or cultural assumptions can shape their perception of symptoms.

Over-reliance on checklists

Without deeper clinical context, checklists may lead to hasty conclusions, especially in mild or complex cases.

Time constraints

In busy settings, limited time for assessment may increase reliance on first impressions rather than comprehensive evaluation.

In conclusion, while professional insight is valuable, balancing it with standardised tools and a full contextual understanding is key to diagnostic accuracy. Reducing subjectivity in ADHD diagnosis is essential to ensuring people are neither mislabelled nor overlooked.

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 Overdiagnosis vs. Underdiagnosis in ADHD.

Avery Lombardi, MSc

Author

Avery Lombardi is a clinical psychologist with a Master’s in Clinical Psychology and a Bachelor’s in Psychology. She has professional experience in psychological assessment, evidence-based therapy, and research, working with both child and adult populations. Avery has provided clinical services in hospital, educational, and community settings, delivering interventions such as CBT, DBT, and tailored treatment plans for conditions including anxiety, depression, and developmental disorders. She has also contributed to research on self-stigma, self-esteem, and medication adherence in psychotic patients, and has created educational content on ADHD, treatment options, and daily coping strategies.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.