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For adults

The following information is a summary of the Guideline and what adults undergoing an assessment should expect.

The National Guideline for the assessment and diagnosis of autism in Australia sets out 66 Recommendations for how assessments that consider a diagnosis of autism should occur.

The Guideline focuses on the practitioners conducting the assessments, such as doctors and allied health practitioners.

However, adults can also use the Guideline to understand the assessment process, including who is involved, and how, where, and when different parts of the assessment are conducted.

What to expect 

If you (or someone in your care) have been referred for an assessment, you should expect:

  • a timely and thorough assessment
  • consideration of your unique needs, strengths and resources
  • prompt referral to support services based on your functioning and needs (regardless of diagnosis)
  • a report summarising the assessment findings and diagnostic decision, explained in person by an expert health professional.

About the Guideline

The Guideline helps ensure that practitioners involved in assessment engage in best practice. This means working in appropriate, evidence-based, and helpful ways with individuals being assessed and their families.

The Guideline was developed through a rigorous process involving extensive community consultation and evidence review. Notably, members of the autistic and autism communities generously shared their experiences, insights, and views to inform the Guideline.

It is approved by the National Health and Medical Research Council (NHMRC), meaning it meets the highest national standard.

Reasons to get an assessment

The purpose of assessments that consider autism is to better understand an individual’s health, development, and wellbeing as the basis for identifying strengths and any support needs.

A proper assessment will not focus just on autism. Instead, it will consider all possible explanations for the aspects of your behaviours and experiences (current and those throughout life so far) that appear to be different to other people.

Sometimes an assessment will result in a diagnosis of autism and/or other conditions. The most important thing is that the assessment helps you or a person in your care to understand your/their strengths and any needs so that a plan for supporting any needs can be put in place where appropriate.

Where to begin

As an adult, you can speak to your primary health care provider (e.g., General Practitioner (GP), Aboriginal Health worker) about any questions or concerns about your challenges or experiences (or those for someone in your care). Sometimes, you may be working with a medical or health practitioner for other reasons (e.g., seeking support for work, education, or personal reasons) and that practitioner may suggest further assessment.

Either way, the primary health care provider should listen to and discuss your questions and concerns and take a broad look at your experiences from childhood through to present day, health, and wellbeing (or those of a person in your care). First, they may do this themselves or refer to another health practitioner.

If the practitioner thinks you or someone in your care may be showing characteristics of autism, they should then begin to follow the assessment and diagnostic process outlined in the Guideline. It is important to remember, however, that they will not just be thinking about autism. Instead, they will be thinking about all the possible explanations for your behaviours and experiences all the way through the assessment process.

It is important to note that if, at this point, you feel like your questions have not been answered or concerns are not addressed, it is okay to seek a second opinion.

What's involved in an assessment

If further assessment is needed, the next step will be to gain a comprehensive understanding of your health, development, experiences, and wellbeing including functional strengths and any support needs.

An Assessment of Functioning involves obtaining a detailed understanding of your abilities (or the abilities of someone in your care), strengths, and any support needs they might have across a broad range of areas. These may include cognitive abilities, speech and language function, daily living skills, social relationships, and work or an educational environment.

A Medical Evaluation involves a physical examination and other medical tests to understand if there could be medical causes for the behaviours or characteristics that prompted the referral.

Where there are characteristics of autism, a Diagnostic Evaluation is then completed. This may involve the use of additional tools (e.g., standardised questionnaires, clinical interviewing) The Guideline explains who should be involved and how the different parts of assessment should happen.

Some aspects of assessment are flexible, for example:

  • Sometimes, all parts of the assessment will be conducted separately, while for other individuals, they will happen at once.
  • Some individuals will see their primary health care provider (e.g., GP) and one other practitioner, while others will work with a larger team.
  • While all assessments must be in-person consultations, sometimes some parts will be conducted by telehealth.

However, there are some aspects of the assessment that are fixed, for example:

  • The assessment must include all parts.
  • People who lead different aspects of the assessment are recommended to have select qualifications (the Guideline explains this in more detail).
  • The assessment must always consider all possible explanations for differences in an individual’s behaviour and experiences compared to others (this is called differential diagnosis).

Some possible outcomes

For some individuals, the assessment leads to a clear finding regarding whether or not autism is an appropriate diagnosis. However, for others, the picture is not so clear, and further assessment may be needed. For example, the team may be expanded to include practitioners with additional expertise, or it may happen over a longer period with more appointments.

It is common for an assessment that considers autism to not result in a diagnosis of autism. For example, an individual being avoidant of particular social situations may be better explained solely by anxiety.

At every stage, the practitioners you work with should talk to you about what they are doing, what they are finding, and what they recommend should happen next. They should explain the reasons for their decisions and encourage you to ask questions.

Their job is to listen and help you be fully informed when making decisions. You are always in control of what happens in an assessment when completing an assessment and feel empowered to ask for what you need.

After an assessment

After the assessment, the Guideline recommends that the practitioners provide you with a written report explained to you and, if appropriate, a family member, friend, or carer in a meeting.

The report will summarise the information collected during the assessment and what this information means. It will also explain any decisions that have been made about a diagnosis and suggest next steps for accessing support services.

Accessing support

Accessing support can, and should, happen at any time it is needed.

Practitioners you work with should ask about what, if any, supports are already in place and if additional supports are needed.

A referral for support should happen as soon as need is identified.