Autism Spectrum Disorder (ASD) Assessments Perth

What is Autism Spectrum Disorder?

Autism is a complex developmental condition that affects how a person thinks, feels, interacts with others, and experiences their environment. Autism is classified as a neurodevelopmental disorder, as it affects early brain development. It is a lifelong condition that begins at birth and persists into old age. Each person with autism is different, with various presentations and severities. Because of this, Autism is described as a spectrum disorder - each diagnosed individual lies on a spectrum.

Autism (ASD) Assessments

To receive an Autism diagnosis in Perth, a person must undergo a combination of assessments, including interviews with the person, family, and professionals who teach or interact with the person. Autism may present similarly to other conditions, so it is important that comprehensive testing by highly experienced clinical psychologists is used to rule out other similar conditions. The psychologists who work at Mindstate Psychology are highly experienced in assessing and diagnosing autism in children and adolescents. Psychologists follow strict autism diagnostic criteria to ensure our autism assessments are reliable and valuable to other health professionals, whilst differentiating between ASD and other neuroatypical presentations or conditions.

When should I consider booking an autism assessment?

While a person can receive an autism spectrum disorder diagnosis at any age, early diagnosis and intervention are especially important. Many aspects of development, such as language, have a critical period where therapeutic intervention can make a significant difference. This does not mean that a diagnosis is any less important, but that some therapies may be less effective.

Autism Spectrum Diagnosis in Children

You should consider an autism assessment for your child if you have any concerns about their development, especially in the areas of social interaction, communication, or repetitive behaviours. Specific signs that may warrant an assessment include:

  • Social interaction: Does your child seem uninterested in other children or have trouble playing with them?
  • ‍Communication: Does your child have trouble speaking or understanding language? Do they repeat phrases or sounds a lot?
  • ‍Repetitive behaviours: Does your child engage in repetitive movements or activities? Do they insist on routines or get upset by changes?
  • Allied Health, Paediatrician or Psychiatrist recommendation: If a professional with extensive experience in child development has recommended an assessment, it's an important sign that you should consider obtaining a formal diagnosis of ASD.

Mindstate Psychology will conduct assessments for children 4 years of age or older.

Autism Spectrum Diagnosis in Adolescents and Adults

There is no age limit for getting an Autism diagnosis. Even as an adolescent or adult aged 18 or older, getting a diagnosis can lead to clarity, improved self-understanding and validation. It can also lead to more support and resources to improve your quality of life. Generally, we would recommend considering an assessment if you experience challenges in:

  • Social interaction: Do you find it difficult to understand social cues, make friends, or navigate social situations?
  • Communication: Do you struggle to express yourself clearly, have trouble with nonverbal communication, or find conversations draining?
  • Repetitive behaviours: Do you have routines you rigidly follow, engage in repetitive movements for comfort, or have fixated interests?
  • Sensory sensitivities: Are you overwhelmed by loud noises, bright lights, certain textures, or strong smells?

Other factors to consider:

  • Self-awareness: Do you suspect you might be autistic based on research or relating to autistic experiences described online or by others?
  • Impact on daily life: Are these challenges causing difficulties in your work, relationships, or overall well-being?
  • Desire for support: Would an autism diagnosis help you access support services or accommodations?

What is the Process for an Autism Diagnosis?

We begin with an initial pre-assessment consultation to ensure our educational assessments are unique to you and your child's situation. This 50-minute appointment allows the assessing psychologist to gather information about the client’s developmental history and current symptoms and discuss the assessment process with you. It is also an opportunity for you to ask any questions. At the conclusion of the pre-assessment consultation, our psychologist will advise you on the most appropriate assessment pathway and how much this may cost.

Generally, the next step is a cognitive assessment. This in-person appointment takes approximately 2 hours (this may need to be done over two sessions for young children) and involves practical and computer-based testing. Depending on the purpose of the assessment, clients may also be asked to complete a range of self-report questionnaires.

The final assessment is an achievement (academic) test. These are similar to cognitive assessments and take approximately 3 hours (this may need to be done over multiple sessions for young children). Achievement tests assess several domains, including comprehensive listening, speaking, reading, writing, and math skills.

This information is then collated and interpreted to provide a report of the client’s overall intellectual functioning and an analysis of their areas of academic strength and weakness, and how this likely impacts their functioning. The report will also provide suggestions for future treatment and support interventions.

Cost of a Comprehensive Autism Assessment in Perth

The final cost for a full educational assessment depends on the complexity of the case, the purpose of the report and the assessing practitioner. Because autism assessments have such a wide range of applications, we encourage you to contact us so that an accurate quote can be provided.

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Frequently Asked Questions about Autism Assessment & Diagnosis in Perth

Do I receive a formal autism diagnosis?

Yes. Following a comprehensive autism assessment at Mindstate Psychology, you will receive a detailed written report that includes a formal diagnosis (if criteria are met) based on DSM-5-TR diagnostic criteria. This report is prepared by a qualified psychologist and can be used for:

  • Accessing NDIS support and funding
  • Educational adjustments and support planning
  • Employment accommodations
  • Medicare-subsidised therapy services (via GP Mental Health Care Plan)
  • Self-understanding and validation

Your diagnostic report will include specific recommendations tailored to your individual profile and support needs.

Can I access other treatments for autism, such as therapy or speech therapy?

Yes. While autism itself is not something that requires "treatment," many autistic individuals benefit from support services that help them thrive. Following your assessment, our psychologists can provide referrals and recommendations for:

  • Psychology services – for co-occurring mental health concerns (anxiety, depression), emotional regulation, social skills development, or neurodiversity-affirming therapy
  • Speech pathology – Speech pathologists are particularly well-suited to providing communication support, pragmatic language skills, or alternative communication methods.  
  • Occupational therapy – for sensory processing support, daily living skills, and environmental modifications

Your diagnostic report can also support applications for NDIS funding services. You may also access psychology support through Medicare (with a GP Mental Health Care Plan) or private sessions at Mindstate Psychology.

Are autism assessments Perth eligible for Medicare rebates?

Partial rebates are available for autism assessments in Perth. The initial intake/clinical interview session can be claimed under Medicare (with a valid GP Mental Health Care Plan or referral from a pediatrician), which helps offset some of the overall assessment cost.

However, the specialised components of the autism assessment, including standardised testing (ADOS-2, ADI-R, cognitive assessments), scoring and interpretation, gathering collateral information, clinical observation, and detailed diagnostic report writing, are not covered by Medicare rebates. These fall outside the scope of standard Medicare-rebated psychology services.

What is the criteria for autism spectrum disorder?

To be diagnosed with autism, a person must show persistent challenges in two key areas:

1. Social communication and interaction

This includes difficulties with:

  • Back-and-forth conversation and sharing interests or emotions with others
  • Understanding and using non-verbal communication like eye contact, facial expressions, and body language
  • Building and maintaining friendships or adjusting behaviour to different social situations

2. Repetitive behaviours and restricted interests

This includes at least two of the following:

  • Repetitive movements, phrases, or use of objects (e.g., hand-flapping, lining up toys, repeating words)
  • Strong preference for routines and sameness; distress when routines change
  • Intense, focused interests in specific topics or objects
  • Unusual responses to sensory experiences (e.g., sensitivity to sounds, textures, lights, or seeking out certain sensations)

These patterns must have been present since early childhood (though they may not be fully noticeable until social demands increase, or may be masked by learned coping strategies), the challenges must impact daily life, relationships, work, or school, and the difficulties are not better explained by another condition.

During the diagnosis process, our psychologists carefully evaluate these areas through clinical interviews, standardised assessments, observations, and gathering information about developmental history.

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How common is autism in Australia?

Autism is more common than many people realise. Current estimates suggest that approximately 1 in 150 Australians are on the autism spectrum.  

Many autistic adults remain undiagnosed, particularly women and gender-diverse individuals, who may have learned to "mask" or camouflage their autistic traits.

Awareness and diagnostic practices have improved significantly, leading to more people receiving accurate diagnoses across the lifespan. Autism occurs across all cultural, ethnic, and socioeconomic backgrounds

Late diagnosis is increasingly common, and an autism diagnosis at any age can provide validation, self-understanding, and access to appropriate support and accommodations.

You can find out more information about autism at the Autism WA website.

If you think you have autism, you can book an assessment with one of our highly experienced autism psychologists.

Why Choose Mindstate Psychology for an ASD Assessment?

Mindstate Psychology is a well-established practice in Perth, Western Australia, with extensive experience in autism assessment across the lifespan. The psychologists working at Mindstate are trained in gold-standard diagnostic tools, including the ADOS-2 (Autism Diagnostic Observation Schedule) and comprehensive cognitive assessments, ensuring accurate and thorough evaluation for both children and adults.

We are committed to neurodiversity affirming practice, which means we view autism as a natural variation in human neurology rather than a deficit to be "fixed." Our assessment and diagnosis process focuses on understanding your unique profile, identifying strengths alongside challenges, and providing recommendations that honour your identity and support your well-being. All our assessments include recommendations to support other allied health professionals, including psychologists and speech pathologists, teachers, and other multidisciplinary professionals involved in supporting your child's development.  

With access to an extensive testing library and flexible assessment approaches, we tailor each evaluation to your individual needs, communication style, and presentation style. Whether you're seeking a diagnosis for the first time, pursuing a second opinion, or supporting your child through the assessment process, our experienced team provides compassionate, thorough, and clinically rigorous assessments in a safe and validating environment.

Book an Autism Assessment

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