What do the CADDRA guidelines recommend for assessing ADHD in adults?

Assessment combines an interview, history and rating scales

Your clinician needs a clinical picture, not just a questionnaire score. Screening can identify questions to explore, but it cannot settle the diagnosis. (camh.ca)

This summary follows the Canadian ADHD Practice Guidelines, edition 4.1, published by the Canadian ADHD Resource Alliance, CADDRA, in 2020. Chapter 1, Diagnosis of ADHD, sets out assessment. Chapter 2, Differential Diagnosis and Comorbid Disorders, addresses alternative explanations and conditions that may coexist with ADHD. (caddra.ca)

These recommendations combine published research with expert consensus. For adults with possible ADHD, they describe a clinical process, not a trial comparing assessment packages. There is no single comparator, measured accuracy gain or effect size attached to following the whole process. (caddra.ca)

1. Gather information from you, available records and people who know you.
2. Review physical health and everyday habits.
3. Complete an ADHD-focused interview, including strengths and difficulties.
4. Explain the findings and recommendations. (caddra.ca)

Ask how these pieces fit together in your case. You should not have to work out the meaning of a score on your own or guess which information is still missing.

History connects childhood symptoms with current difficulties

The interview needs to establish a lasting pattern and its impact on daily life, rather than describe only the week before your appointment. (caddra.ca)

For adults, the guideline uses at least five symptoms in the inattentive or hyperactive-impulsive group, or both, lasting at least six months. Several symptoms must have been present before age 12 and occur in at least two settings. There must also be evidence that symptoms interfere with functioning. (caddra.ca)

The CADDRA ADHD Assessment Form prompts review of development, family history, school and work, home life, relationships and previous assessments. It includes strengths and supports, not just a checklist of difficulties. (caddra.ca)

Collateral information means observations from someone else. CADDRA's adult flowchart seeks information from someone who knows you now and, when possible, someone who knew you as a child. These perspectives answer different questions. (caddra.ca)

CAMH's Adult ADHD: Screening and Assessment, adapted from Psychiatry in Primary Care, published by CAMH in 2019, cautions against dismissing ADHD because of good grades, professional achievement or calm behaviour during an appointment. Missing report cards or unclear childhood memories call for exploration, not automatic exclusion. (camh.ca)

When preparing, separate what you remember from what you have been told. Note supports that were in place, not just whether you passed classes. Leave uncertain details marked as uncertain rather than trying to fill every gap.

Each assessment tool answers a different question

CADDRA's tools organize information for clinical interpretation; their names and scores do not make them stand-alone diagnostic decisions. (caddra.ca)

CAMH's Adult ADHD: Diagnosis, also adapted from its 2019 primary-care text, recommends documenting baseline impairment with the WFIRS-S. A symptom rating describes what someone experiences; an impairment rating records where those difficulties disrupt life. (camh.ca)

That is clinical guidance for assessing adults, not a comparative validation study. CAMH does not attach a numerical improvement in diagnostic accuracy to adding this form. (camh.ca)

Ask which questionnaires your clinician wants before completing extra ones. If an item is unclear, note what you understood it to mean and bring an example. Answer about your actual experience rather than trying to make every response point toward ADHD.

The assessment checks what else could explain symptoms

Attention difficulties warrant a medical and mental-health review alongside the ADHD interview. CADDRA places this review within its adult assessment pathway. (caddra.ca)

Chapter 2 distinguishes an alternative explanation from a condition that coexists with ADHD. Identifying another condition does not automatically exclude ADHD. (caddra.ca)

• Mental health and circumstances: consider anxiety, depression, mood episodes, substance-use concerns and psychosocial stressors. (camh.ca)
• Sleep and physical health: review sleep problems, thyroid disease, anaemia, hearing or vision concerns and head injuries. (caddra.ca)
• Health history: review current medicines, previous reactions and relevant physical examination findings. (caddra.ca)

CADDRA recommends a physical examination, or documentation of one completed by another clinician. Laboratory or other investigations depend on findings suggesting another condition; they are not a routine ADHD confirmation panel. (caddra.ca)

Describe when attention problems began and what else was happening then. You do not need to settle the explanation yourself. Bring relevant reports and ask which findings need follow-up before a conclusion can be reached.

If a learning disability is suspected, CAMH recommends considering a psychological assessment. Ask what question that referral would address and how its findings would contribute to your assessment. (camh.ca)

What the evidence does not show

Recommendations for a thorough assessment should not be read as numerical promises about diagnostic accuracy or personal outcomes.

Kessler and colleagues' ASRS validation study, published in Psychological Medicine by Cambridge University Press in 2005, involved 154 US community-survey respondents, oversampling people reporting childhood ADHD with adult persistence. It compared questionnaire scores against blinded DSM-IV clinical diagnoses, not treatment outcomes. (cambridge.org)

The six-item screener missed roughly a third of clinical cases. These are measurements from a US sample using DSM-IV criteria, not accuracy estimates for Canadian clinics. Screening cannot replace a clinical assessment. (cambridge.org)

CAMH's recommendation to consider psychological assessment when a learning disability is suspected is conditional. It does not establish that every adult needs a psychological testing battery. (camh.ca)

These sources should not be read as evidence of Finding Focus outcomes or as certification of its assessment process. Guideline alignment describes an approach, not a measured clinic-specific result.

How this applies in Canada

Use CADDRA's Canadian framework to ask how your clinician will build and explain an assessment, rather than to predict its answer.

CAMH's Canadian primary-care resources use CADDRA forms and distinguish symptoms from impairment. These are clinical instructions for assessing adults, not evidence that every service follows an identical process. (camh.ca)

1. Prepare a short timeline. Note when difficulties first appeared, where they affect you now, and which periods of your life you want help understanding.
2. Gather available records. Ask which reports are relevant and how to send them securely. Ask for advice even if your paperwork is incomplete.
3. Discuss collateral beforehand. Tell the clinician if family contact is impossible, unwanted or unsafe. Ask what other information could be used and what uncertainty would remain.
4. Request a clear conclusion. Ask which criteria are supported, which alternatives were considered, and whether further information or referral is needed.

If the conclusion is not ADHD, ask what the assessment did identify and what next step is appropriate for your difficulties. The aim is an explanation grounded in the available evidence, not a particular label.

Before the appointment ends, ask who will arrange any outstanding checks and how you will receive the final explanation. Keep a note of questions that remain unanswered.