What are the ten diagnostic criteria for attention-deficit/hyperactivity disorder (ADHD)?

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Ten Diagnostic Features of ADHD

The diagnosis of ADHD is based on DSM-5 criteria, which requires meeting specific symptom thresholds in two core domains (inattention and/or hyperactivity-impulsivity), with symptoms present before age 12, occurring in multiple settings, and causing functional impairment. 1

While the question asks for "ten diagnostic features," ADHD diagnosis is not structured as ten discrete features but rather as a comprehensive set of criteria organized into key domains. Here's the algorithmic approach to diagnosis:

Core Diagnostic Requirements

1. Symptom Domain: Inattention

At least 6 symptoms (5 for adolescents ≥17 years and adults) from the inattention list must be present for at least 6 months. These include:

  • Difficulty sustaining attention in tasks
  • Appearing not to listen when spoken to directly
  • Failing to follow through on instructions
  • Difficulty organizing tasks and activities
  • Avoiding tasks requiring sustained mental effort
  • Losing necessary items
  • Being easily distracted by extraneous stimuli
  • Forgetfulness in daily activities
  • Making careless mistakes 2

2. Symptom Domain: Hyperactivity-Impulsivity

At least 6 symptoms (5 for adolescents ≥17 years and adults) from the hyperactivity-impulsivity list must be present for at least 6 months. These include:

  • Fidgeting or squirming
  • Leaving seat when remaining seated is expected
  • Running or climbing inappropriately
  • Unable to engage quietly in leisure activities
  • Being "on the go" or acting as if "driven by a motor"
  • Talking excessively
  • Blurting out answers before questions are completed
  • Difficulty waiting turn
  • Interrupting or intruding on others 2

3. Age of Onset Criterion

Several inattentive or hyperactive-impulsive symptoms must have been present before age 12 years. This is critical—documented or reported manifestations before this age are mandatory. 1, 2

4. Pervasiveness Across Settings

Symptoms must be present in at least two settings (e.g., home, school, work, with friends or relatives, in other activities). This cannot be diagnosed based on single-setting observations. 1, 2

5. Functional Impairment

Clear evidence that symptoms interfere with or reduce the quality of social, academic, or occupational functioning must be documented. Symptoms alone without impairment do not meet diagnostic criteria. 1

6. Exclusion of Other Explanations

Symptoms are not better explained by another mental disorder (e.g., mood disorder, anxiety disorder, dissociative disorder, personality disorder, substance intoxication or withdrawal). 2

7. Collateral Information Requirement

Diagnosis requires information from multiple informants across different settings. Use standardized rating scales from parents, teachers, and when appropriate, the patient themselves. Single-source reporting is insufficient. 1, 3

8. Phenotype Classification

Determine the presentation type:

  • Combined presentation: Meets criteria for both inattention and hyperactivity-impulsivity
  • Predominantly inattentive presentation: Meets inattention criteria only
  • Predominantly hyperactive-impulsive presentation: Meets hyperactivity-impulsivity criteria only 2

9. Comorbidity Screening

Screen for comorbid conditions that commonly co-occur and may alter treatment approach, including:

  • Emotional/behavioral: anxiety, depression, oppositional defiant disorder, conduct disorders, substance use
  • Developmental: learning disabilities, language disorders, autism spectrum disorders
  • Physical: tics, sleep disorders 1

The majority of children with ADHD meet criteria for another mental disorder, making this screening essential rather than optional.

10. Developmental Context and Severity

Symptoms must be inappropriate for the developmental level and assessed for severity (mild, moderate, severe) based on degree of functional impairment. What appears as ADHD symptoms may be developmentally normal in younger children. 1

Critical Diagnostic Pitfalls to Avoid

For adolescents presenting for first-time evaluation: You must establish that symptoms were present before age 12, even if diagnosis is being made later. Strongly consider whether mimicking conditions (substance use, depression, anxiety) are present rather than or in addition to ADHD. 1

Problem-level behaviors: Children who demonstrate hyperactivity, impulsivity, or inattention but don't fully meet DSM-5 criteria should not be diagnosed with ADHD. These require closer review of diagnostic criteria with additional information from other settings. 1

Substance effects: Marijuana and other substances can mimic ADHD symptoms. Steroids, antihistamines, anticonvulsants, caffeine, and nicotine can produce similar adverse effects. 4

Context-dependent variability: Expect variability in ratings between settings and informants—this is normal and provides valuable clinical insight rather than invalidating the diagnosis. 1

References

2
Research

Attention deficit hyperactivity disorder.

Handbook of clinical neurology, 2020

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