When assessing for Attention-Deficit/Hyperactivity Disorder (ADD/ADHD), it’s not just about confirming or ruling out a single diagnosis. Research shows that approximately 80% of individuals diagnosed with ADD/ADHD have at least one comorbid condition—meaning they experience another psychological disorder alongside ADHD. This overlap can significantly impact functioning, treatment, and long-term outcomes.
At Calvert + Associates, we take a thorough and structured approach to identifying both comorbidities and differential diagnoses, ensuring that each client receives an accurate understanding of their cognitive and emotional profile.
Comorbidities refer to additional disorders or conditions that occur alongside ADHD. These are not mere symptoms—they are diagnosable conditions that often interact with ADHD and can complicate or mask its presentation.
Identifying comorbidities is essential for developing a personalized treatment plan that addresses the full scope of an individual’s experience—not just ADHD symptoms in isolation.
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Differential diagnosis is the process of distinguishing ADD/ADHD from other conditions that may present with similar symptoms. This is essential because many neurodevelopmental, psychiatric, medical conditions, etc., can mimic or overlap with the symptoms of ADHD, such as inattention, impulsivity, and hyperactivity.
Differentiating these conditions ensures clients are not misdiagnosed and receive the appropriate therapeutic interventions.
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We believe that a proper ADD/ADHD evaluation must be comprehensive. At Calvert + Associates, psychological testing goes beyond surface-level screening. Here’s what our process includes:
We can also collect information from:
This helps us understand how symptoms present across environments.
We use the evidence-based assessment: Brown Attention-Deficit Disorder Scale and Diagnostic Form (for ages 3+).
If you are looking for more information about this assessment, visit the ADD/ADHD Testing Info Page (ADD/ADHD Testing and Assessment) for a detailed breakdown of everything you'd need to know.
As a simple step-by-step outline, this is what to expect:
All of this is explained in more detail on the ADD/ADHD Testing Info page, which can be read using this link: ADD/ADHD Testing and Assessment
These provide additional screening for more information if the ADD/ADHD assessment (e.g., Brown ADD Scale and Diagnostic Form - this is what we use) picks up on previously discussed comorbidities or differential diagnoses, which allows for a more comprehensive treatment plan.
More to come in the future!
All data points—clinical impressions/observations, clinical interview information, test results, functional observations, and collateral input—are synthesized to provide:
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Getting the diagnosis right from the beginning is crucial. Misdiagnosis can lead to:
Whether you’re seeking clarity for yourself or your child, we’re here to walk with you through this journey—ensuring that every possible explanation is considered, and the most accurate conclusions are drawn.
Comorbid disorders can worsen the prognosis of ADHD, leading to greater functional impairment and increased risk for academic, occupational, and social difficulties.
Many disorders share symptoms with ADHD. Careful differential diagnosis ensures that individuals receive the correct diagnosis and avoid unnecessary or ineffective treatments.
If you or a loved one is struggling with attention, focus, restlessness, or emotional regulation, it may be more than just ADHD—or it may be something else entirely. Let us help you find clarity.
Office Administrator: Mandy
Examiner: Michael Hoye, LPC, ADHD-CCSP
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