Collateral Information Forms for Adult ADHD Diagnosis
When diagnosing ADHD in adults, use structured rating scales including the Wender Parent's Rating Scale for retrospective childhood symptoms and the Conners Adult ADHD Rating Scale (which has collateral/observer versions) to obtain information from spouses, parents, or significant others. 1
Specific Validated Forms Available
For Retrospective Childhood Assessment
- Wender Parent's Rating Scale (WPRS) and Wender Utah Rating Scales (WURS) - These instruments retrospectively assess childhood ADHD symptoms through third-party recall 1, 2
- Childhood Symptoms Scale by Barkley and Murphy - Designed specifically for retrospective assessment of childhood ADHD symptoms 2
For Current Adult Symptoms (Collateral Versions)
- Conners Adult ADHD Rating Scales (CAARS) - Has dedicated observer/other report forms in addition to self-report versions 1, 2, 3
- Current Symptoms Scales (CSS) by Barkley and Murphy - Includes other report forms for collateral information 2, 4
- Attention Deficit Hyperactivity Disorder--Other Report Scale (ADHD-OR) by Rösler et al. - Specifically designed for use by significant others 2
- Brown ADD Rating Scale (Brown ADD-RS) - Can be used by clinicians or significant others 2, 4
Comprehensive Diagnostic Interviews
- Adult Interview (AI) by Barkley and Murphy - Comprehensive procedure that can incorporate collateral information 2
- Brown ADD Diagnostic Form - One of the most comprehensive procedures available 2
Clinical Context and Caveats
The actual clinical utility of collateral information is controversial. While guidelines recommend obtaining information from spouses, parents, or friends because adults with ADHD often underestimate symptom severity and impairments 1, recent evidence challenges this practice. A large clinical study found that disagreement between self- and collateral reports on childhood ADHD symptoms occurred in 38% of patients, yet these disagreement and agreement groups showed similar treatment response, comorbidity profiles, and only small differences in impairment measures 5. This suggests collateral information may have limited incremental diagnostic value in adults with self-reported ADHD history 5.
Self-report versus collateral discrepancies are common but may not be clinically meaningful. Self-reports and collateral reports of symptoms are highly correlated, though patients tend to report more inattentive symptoms than collaterals in both childhood and current functioning 6. The method of diagnosis significantly impacts persistence estimates—sole reliance on self-reports with strict DSM symptom thresholds leads to very low persistence estimates (4-40%), while combining self and informant ratings with age-appropriate thresholds yields 40-50% persistence rates 7.
Practical Implementation
Collect both self and informant ratings using structured scales rather than unstructured interviews. Most validated instruments use Likert scales (typically 0-3) to quantify ADHD symptoms, making them useful for tracking disease course over time 2. The evaluation should systematically assess:
- Retrospective childhood symptom onset (before age 12 per DSM-5) 3
- Current symptom severity and frequency 4, 3
- Pervasiveness across multiple settings 2
- Functional impairment in major life activities 2, 4
- Comorbid conditions (anxiety, mood, substance use, personality disorders) 1, 3
When collateral information is unavailable or contradicts self-report, do not automatically exclude the diagnosis. Focus instead on current functional impairment, comprehensive clinical history, and response to treatment, as these may be more diagnostically relevant than perfect agreement on childhood symptoms 5.