A growing number of Australian GPs are now doing adult ADHD assessments. State-by-state prescribing reforms have opened the pathway. The training is available. The patient demand is real.
The challenge is not willingness. It is consistency. Without a defined evidence framework, different GPs collect different information, assessments vary in depth, and the documentation behind a Schedule 8 prescribing decision can range from thorough to thin.
This post covers the five components that a defensible adult ADHD assessment requires. Not as a rigid protocol. Clinical judgement always applies. It is a framework for what the evidence package should look like before a conclusion is reached.
1. A validated self-report questionnaire
The Adult ADHD Self-Report Scale version 1.1 (ASRS v1.1) is a validated instrument aligned with DSM-5 criteria for adult ADHD assessment. It was developed by the WHO and is referenced in the AADPA Australian Evidence-Based Clinical Practice Guideline for ADHD, the national guideline endorsed by both RACGP and RANZCP.
The ASRS v1.1 covers 18 items across two subscales: inattention (9 items) and hyperactivity-impulsivity (9 items). Part A is the six-item screener. Part B extends the picture across all 18 items.
What it provides: a standardised, quantified baseline that can be scored, compared across visits, and documented in the clinical record. Unstructured symptom history-taking produces findings that are difficult to audit and impossible to compare across patients.
A practical note on administration: the ASRS was designed for pencil-and-paper use. When administered live in a consultation, the GP is scoring and managing the clinical conversation simultaneously. Pre-appointment digital administration produces cleaner data. The patient has time to read and consider each item. The GP receives the scores before the appointment starts. The consultation can open at the clinical reasoning stage, not the data entry stage.
2. An observer report
ADHD affects the subjective experience of the person living with it. That experience can be unreliable in both directions. High anxiety can amplify scores. Habitual compensation can suppress them. Extensive reading about ADHD can shape how a patient rates their own symptoms without that shaping being dishonest.
An observer report is a structured questionnaire completed independently by someone who knows the patient well: a partner, parent, sibling, or employer. It asks them to rate the same DSM-5 symptom categories from their own perspective. No clinical training required.
What this adds: the self-report describes how the patient experiences themselves. The observer report describes how they appear to others. Where the two align, confidence in the pattern increases. Where they diverge, the discrepancy itself becomes clinically meaningful. It is not a red flag. It is a question worth exploring in the consultation.
Without an observer report, the assessment rests on a single source. That source may be accurate. It may also reflect anxiety, recent reading, or a gap between self-perception and observed behaviour. There is no way to know which without a second data point.
3. Childhood onset documentation
DSM-5 criterion B requires that several inattentive or hyperactive-impulsive symptoms were present prior to age 12. This is not a technicality. ADHD is a neurodevelopmental condition. It does not emerge in adulthood. A presentation without established childhood onset does not meet the diagnostic criteria, regardless of current symptom severity.
Establishing childhood onset requires evidence. That evidence can come from school reports describing attention difficulties, incomplete work, or behaviour concerns; childhood medical records; a parent or sibling’s account of the patient’s childhood behaviour; or structured childhood self-report completed by the patient.
Not every patient has school reports. High-achieving patients may have compensated well enough that their reports reflect the compensation rather than the underlying difficulties. Some grew up in households where these difficulties were never formally noted. Absence of documentary evidence is not the same as absence of childhood onset. The GP still needs something concrete to anchor the historical picture.
Without it: the DSM-5 criterion is unmet. Prescribing on the basis of current symptom severity alone, without establishing childhood onset, creates clinical and medicolegal exposure, particularly in the context of Schedule 8 medication management.
4. Differential diagnosis screening
ADHD shares symptom overlap with a range of conditions. A thorough assessment does not stop at confirming ADHD. It considers what else might explain the picture.
Conditions that warrant structured screening include:
- Thyroid dysfunction: fatigue, concentration difficulties, and mood changes can present as inattention
- PTSD: hypervigilance, concentration impairment, and emotional dysregulation overlap significantly with ADHD
- Generalised anxiety: chronic worry and distractibility are clinically similar to the inattentive presentation
- Mood disorders: depression and bipolar disorder both produce concentration difficulties, impulsivity, and sleep disruption
- Sleep disorders: unrefreshing sleep and sleep apnoea generate a daytime attention profile that can be indistinguishable from ADHD in a single-consultation context
- Substance use: both active use and withdrawal can produce behaviour and concentration changes consistent with ADHD presentations
This is not a gatekeeping exercise. It is information gathering. A brief structured history covering current medications, medical history, mental health history, and substance use takes a patient ten minutes to complete before the appointment. It gives the GP the context to consider differentials during the clinical interview.
Without it: the GP makes a decision based on ADHD symptom ratings without visibility of the factors that might explain or complicate the picture.
5. The structured clinical interview
The four components above produce data. The clinical interview produces a conclusion.
This is where the GP applies DSM-5 criteria to the evidence, explores specific items directly with the patient, tests the hypotheses that emerged from the differential screening, and makes a clinical judgement. The questionnaire scores inform it. The observer report provides context. The childhood history establishes the timeline. The differential screening shapes the alternatives considered.
No questionnaire, algorithm, or scoring system substitutes for this step. A GP’s clinical judgement in reaching that conclusion cannot be delegated to a scoring system: AHPRA’s guidance on AI in healthcare is explicit that using a digital tool does not transfer clinical responsibility away from the treating practitioner. A conclusion reached on questionnaire scores alone, without a clinical assessment, does not meet that standard.
The interview also allows the GP to observe things no form can capture: whether the patient’s examples of symptoms are specific and consistent with ADHD or reflect generalised life stress; how they present and respond in real time; whether the childhood history sounds genuine and detailed or constructed retrospectively.
The quality of the clinical interview depends on the quality of the preparation that preceded it. A GP who enters the consultation with all four prior evidence components already collected and reviewed can spend the full appointment on clinical reasoning. A GP who is collecting that same information live has five to ten minutes left for the conversation that matters.
When all five are in place before the appointment
The five requirements above are clinically consistent across every Australian jurisdiction. They reflect DSM-5 criteria, RACGP-endorsed clinical guidance, and the standard of clinical judgement required for defensible adult ADHD prescribing under Schedule 8 authority.
The practical challenge is not knowing what the requirements are. It is the logistics of collecting all five before the appointment. The ASRS takes time to administer. The observer report requires a second contact and an independent questionnaire. Childhood documentation needs to be requested, found, and uploaded. Differential screening requires a structured history. Done sequentially inside a consultation, these steps occupy most of the available time and leave little room for the clinical reasoning they are supposed to support.
Velluto collects the first four automatically before the appointment. The patient completes the ASRS, medical and mental health history, childhood self-report, and document upload from their phone. The observer receives their own questionnaire and is chased automatically if they do not respond. On the morning of the appointment, the GP opens their dashboard and sees a structured summary of everything that has been collected.
The consultation starts at step five.
Frequently asked questions
Is the ASRS v1.1 enough on its own?
No. The ASRS gives you a standardised, quantified baseline that can be scored and compared across visits, but it is one of five components. On its own it produces a symptom rating, not an assessment. The childhood onset evidence, the observer report, the differential screening and the clinical interview are what turn a score into a defensible conclusion.
What if the patient has nobody who can complete an observer report?
Document the attempt and the reason it was not possible, then weight the remaining four components accordingly and note the limitation in the record. An assessment without collateral rests on a single source, which may be accurate but cannot be checked. Recording why it is absent is more defensible than proceeding as though it were never required.
What counts as childhood onset evidence when there are no school reports?
School reports are one option, not the only one. Childhood medical records, a parent or sibling’s account of the patient’s childhood behaviour, and structured childhood self-report completed by the patient all serve. Absence of documentary evidence is not the same as absence of childhood onset, but the GP still needs something concrete to anchor the historical picture.
Does every patient need all five components?
The five are a framework for what the evidence package should look like, not a rigid protocol. Clinical judgement always applies. The value is in knowing what is present and what is missing before a conclusion is reached, so any gap is a deliberate choice rather than an oversight.
What does it mean when the self-report and the observer report disagree?
The discrepancy is clinically meaningful in itself. It is not a red flag. The self-report describes how the patient experiences themselves and the observer report describes how they appear to others, so divergence is a question worth exploring in the consultation rather than a problem with the data.
Can questionnaire scores alone support a Schedule 8 prescribing decision?
No. A clinical conclusion reached on questionnaire scores alone does not meet DSM-5 diagnostic requirements, and AHPRA guidance is explicit that using a digital tool does not shift clinical responsibility away from the GP. The four data-gathering components inform the interview; the interview is where DSM-5 criteria are applied and the judgement is made.
Are there cross-culturally validated ADHD screening instruments?
This is a real limitation rather than a solved problem, and it was the subject of a session on culturally responsive assessment at the 2026 AADPA conference. The ASRS has been translated into many languages, but translation and cross-cultural validation are not the same thing, and the evidence base is uneven across populations. Symptom expression, what is considered notable enough to report, and who is available to give a collateral account all vary. Treat a score from a patient whose background differs from the validation population as a starting point for the clinical interview rather than a settled measure, and weight the interview and the collateral account accordingly.
Clinical information disclaimer
This article contains general clinical information for healthcare professionals. It is not a substitute for individual clinical judgement, professional guidelines, or specific patient assessment. Always apply your own clinical reasoning when making treatment decisions.
Velluto is a clinical intake platform. It does not diagnose, recommend treatment, or make clinical decisions. All clinical decisions remain with the treating GP.