Considering an autism assessment as an adult often brings practical questions alongside the larger question of diagnosis. What actually happens during the appointments? Which autism tests are used? Do your parents need to participate? What if you have learned to mask autistic characteristics? And how does a psychologist decide whether autism, or something else, best explains your experiences?

A comprehensive adult autism assessment is not simply a test for autism. There is no single score, questionnaire, interview, or observation that can answer the diagnostic question on its own.

Instead, assessment involves bringing together information about a person’s developmental history, social communication, relationships, routines and interests, sensory experiences, mental health, everyday functioning, and current circumstances.

The precise process varies between clinicians and between individuals. Assessment methods should be selected according to the person and the clinical question rather than automatically administering the same battery to everyone.

Step 1: Clarifying the Assessment Question

A good assessment begins before any autism-specific testing takes place.

The clinician first needs to understand why autism is being considered and what the person hopes the assessment will clarify.

Some adults have suspected autism for many years. Others begin wondering after a child, sibling, partner, or friend is diagnosed. Some arrive after previous diagnoses of ADHD, anxiety, depression, OCD, or other conditions have explained parts of their experience but not the whole picture.

The initial conversation may therefore explore questions such as:

  • What led you to consider autism?
  • Which experiences are you hoping to understand?
  • Have these patterns been present since childhood?
  • What previous diagnoses or assessments have you received?
  • Are ADHD or other conditions also being considered?
  • Are you seeking diagnosis primarily for self-understanding, treatment planning, accommodations, documentation, or another reason?

At Solasta Counselling in Calgary, for example, adults can begin with a free 20-minute consultation, and a physician’s referral is not required.

The consultation itself is not an autism assessment. Its purpose is to clarify the question, explain the process, and determine whether the proposed assessment is appropriate.

Step 2: A Detailed Clinical and Developmental Interview

The clinical interview is often one of the most important parts of an adult autism assessment.

Rather than simply working through a checklist of autistic characteristics, the psychologist is trying to understand the pattern across the person’s life.

The interview may explore:

  • early childhood development;
  • friendships and peer relationships;
  • conversation and social communication;
  • romantic and family relationships;
  • play and imagination during childhood;
  • school experiences;
  • university or post-secondary education;
  • employment;
  • routines and responses to change;
  • focused or unusually important interests;
  • sensory experiences;
  • repetitive or self-regulatory behaviours;
  • emotional regulation;
  • executive functioning;
  • independent living;
  • masking and compensatory strategies;
  • mental health history; and
  • previous diagnoses and treatment.

Some of these questions may seem only indirectly related to autism. That is intentional.

The clinician is not simply looking for evidence supporting autism. They should also be looking for evidence that challenges that hypothesis and considering alternative explanations.

Why Developmental History Matters

Autism is a neurodevelopmental condition. Although it may not be recognized until adulthood, the underlying characteristics originate during development.

This makes childhood history particularly valuable.

A person does not need to have looked stereotypically autistic as a child. Strong language skills, academic success, structured environments, supportive families, learned coping strategies, or masking can all affect how visible difficulties were to other people.

Instead, the psychologist may look retrospectively for patterns involving social development, friendships, communication, routines, interests, sensory experiences, play, flexibility, and responses to the social demands of childhood and adolescence.

Sometimes these patterns become much clearer when the person’s childhood experiences and adult experiences are considered together.

Do My Parents Have to Participate?

No, not necessarily.

A parent or other person who knew someone during childhood can provide valuable information, particularly because memories of early development may be difficult to reconstruct decades later.

But adult assessment needs to accommodate reality.

Parents may have died. Families may be estranged. A parent may have limited recall. Some adults were adopted or raised in circumstances where early developmental information is unavailable. In other cases, involving family may simply not be appropriate.

Other potentially useful sources include:

  • school report cards;
  • previous psychoeducational or psychological assessments;
  • medical or developmental records;
  • childhood documents;
  • siblings or other relatives; and
  • the adult’s own recollections.

The important issue is not whether a particular informant is available, but how confidently the clinician can understand the person’s developmental history from the evidence that exists.

Step 3: Standardized Autism Assessment Tools

Standardized assessment tools can provide important information, but they need to be understood correctly.

At Solasta Counselling, adult autism assessments may draw on established instruments including the ADOS-2, ADI-R, and MIGDAS-2, with tool selection individualized according to the person’s presentation and assessment needs.

These instruments do different things. They should not be thought of as three interchangeable “autism tests.”

ADOS-2

The Autism Diagnostic Observation Schedule, Second Edition (ADOS-2) provides a structured context in which the clinician can observe aspects of social communication, interaction, and behaviour.

For verbally fluent adults, this generally involves conversation and structured activities rather than anything resembling a conventional written test.

The ADOS-2 can provide valuable standardized observational information.

But an important distinction is:

An ADOS-2 score is not the same thing as an autism diagnosis.

A person’s behaviour during a relatively brief structured interaction represents one source of evidence. It does not, by itself, establish the developmental history required for diagnosis or fully explain how someone functions across relationships, work, home, and other environments.

This becomes particularly important when assessing adults who have spent many years developing compensatory social strategies.

ADI-R

The Autism Diagnostic Interview-Revised (ADI-R) is a structured developmental interview used to explore behaviours and characteristics relevant to autism across development.

When appropriate developmental informants are available, this type of information can help the psychologist examine whether current characteristics form part of a longstanding developmental pattern rather than emerging only later in life.

Again, however, the value lies in how this information contributes to the overall clinical formulation, not simply whether an individual score crosses a threshold.

MIGDAS-2

The Monteiro Interview Guidelines for Diagnosing the Autism Spectrum, Second Edition (MIGDAS-2) provides another approach to gathering autism-relevant clinical information.

Rather than treating assessment as a sequence of symptoms to endorse or reject, the MIGDAS-2 can help explore the person’s distinctive ways of communicating, experiencing sensory information, developing interests, and describing their internal experience.

Different clinicians use these tools differently, and not every adult needs every instrument.

That is an important feature of individualized psychological assessment rather than a weakness.

What About Autism Questionnaires?

Adults may also complete questionnaires examining autistic characteristics or related areas such as masking, sensory experiences, executive functioning, mental health, or adaptive functioning.

These measures can be very useful.

They are not diagnostic by themselves.

Someone can score highly on an autism screening questionnaire without meeting diagnostic criteria for Autism Spectrum Disorder. Conversely, an autistic adult may not produce an obviously elevated score on every measure.

Questionnaire responses can also be influenced by ADHD, anxiety, OCD, depression, trauma, personality, interpretation of questions, self-awareness, and many other factors.

The psychologist therefore needs to interpret the pattern of results in context.

What If I Mask During the Assessment?

This is one of the most common concerns among adults seeking assessment.

Masking or camouflaging can involve consciously or unconsciously adapting behaviour to meet social expectations. Examples include rehearsing conversations, monitoring eye contact, imitating other people’s social behaviour, suppressing repetitive movements, or relying on learned rules for social situations.

A person may therefore appear socially capable during an assessment while experiencing the interaction very differently internally.

A comprehensive evaluation should not ask only:

Did this person look autistic during the appointment?

It should also ask:

How does this person actually navigate social situations, how much effort does that require, how did these patterns develop, and what happens across environments and over time?

This is particularly relevant when assessing people whose autism may have been overlooked earlier in life.

Our guide to autism in adult women explores masking and late identification in greater detail.

Differential Diagnosis: Could It Be Something Else?

This is where a comprehensive assessment differs most clearly from an autism screening exercise.

Many experiences associated with autism can also occur in other conditions.

ADHD may involve executive-functioning difficulties, intense interests, sensory differences, conversational difficulties, emotional dysregulation, and inconsistent social functioning.

Social anxiety can produce avoidance, difficulty making eye contact, uncertainty during conversation, and significant social exhaustion.

OCD can involve repetitive behaviour, rigid patterns, distress when things are not completed in a particular way, and intrusive thoughts.

Depression can affect social engagement, motivation, concentration, energy, and everyday functioning.

Trauma-related difficulties can affect relationships, emotional regulation, sensory responses, trust, and perceptions of safety.

Other developmental, psychological, medical, personality, and contextual factors may also need consideration.

These possibilities are not mutually exclusive. Someone can be autistic and have ADHD, anxiety, OCD, depression, trauma-related difficulties, or other conditions.

The question therefore is not merely:

Can I find evidence of autism?

A stronger clinical question is:

Which explanation, or combination of explanations, best accounts for this person’s developmental history and current functioning?

That distinction matters.

What If the Different Tests Disagree?

This can happen, and it does not necessarily mean the assessment has failed.

An adult might report substantial autistic characteristics on questionnaires while showing relatively few observable characteristics during a structured assessment. A parent may remember childhood differently from the adult. Someone may have a developmental history suggestive of autism but an ADOS-2 score below an algorithm threshold.

These discrepancies are information to interpret, not problems to hide.

The psychologist needs to consider why the findings differ.

Possible explanations might involve masking, context, inaccurate recall, differences between internal experience and observable behaviour, overlapping conditions, characteristics that changed in expression across development, or limitations of particular assessment methods.

This is one reason psychological diagnosis requires clinical integration rather than simply adding up test scores.

An Autism Assessment Is Not Pass or Fail

Adults sometimes worry about whether they will “pass” the ADOS or whether their autism assessment will be “negative.”

That language can be misleading.

The purpose of assessment should not be to prove that someone is autistic. Nor should it be to disprove someone’s understanding of themselves.

The goal is diagnostic clarification.

Sometimes the evidence supports Autism Spectrum Disorder.

Sometimes autism does not provide the best explanation.

Sometimes the assessment identifies ADHD, anxiety, OCD, another condition, or a combination of factors.

A useful assessment should leave the person with a better understanding of themselves even when the eventual conclusion is different from what they expected.

How Long Does an Adult Autism Assessment Take?

There is no universal timeline because assessment processes differ between providers and individuals.

As a concrete Calgary example, Solasta’s comprehensive adult autism assessment typically involves two to three assessment appointments of approximately two to three hours each, in addition to scoring, interpretation, report preparation, and feedback.

Solasta currently advises allowing approximately 3 to 5 weeks from the first assessment session to the written report, while its fees information describes report turnaround as generally 2 to 4 weeks after the final appointment.

Those are different measurements. One describes the broader assessment process, while the other describes the period following completion of the assessment appointments.

More complex diagnostic questions can require additional time.

How Much Does an Adult Autism Assessment Cost in Calgary?

Fees vary considerably between psychologists and assessment providers, so there is no single Calgary-wide price.

It is worth asking what the quoted fee actually includes.

A comprehensive fee may incorporate:

  • clinical and developmental interviewing;
  • standardized assessment measures;
  • collateral interviews;
  • review of historical records;
  • scoring;
  • interpretation and diagnostic integration;
  • report writing;
  • individualized recommendations; and
  • a feedback appointment.

As a current local reference point, Solasta Counselling lists its comprehensive autism assessment at $3,250. The assessment includes multiple sessions, detailed scoring and interpretation, a comprehensive written report with recommendations, and feedback.

Psychological assessment is not covered by Alberta Health Care in the same way as physician services. Some extended health plans may reimburse part of the cost of services provided by a registered psychologist. Coverage depends on the individual insurance plan.

What Is Included in the Written Report?

A comprehensive report should do more than list test scores.

It may include:

  • the reason for assessment;
  • relevant developmental and personal history;
  • behavioural observations;
  • assessment measures used;
  • results and interpretation;
  • consideration of alternative explanations;
  • diagnostic conclusions where appropriate;
  • an individualized description of strengths and difficulties; and
  • practical recommendations.

The report should ultimately answer the question that brought the person to assessment, not merely document that testing occurred.

What Happens at the Feedback Appointment?

Once the assessment has been integrated, the clinician meets with the person to explain the findings.

A useful feedback session should address:

  • whether diagnostic criteria were met;
  • what evidence contributed to that conclusion;
  • any areas of uncertainty;
  • other diagnoses or factors identified;
  • the person’s particular strengths and difficulties;
  • recommendations; and
  • questions about what happens next.

If autism is diagnosed, the conversation should move beyond simply saying, “You have autism.”

The more useful question becomes:

What does this particular person’s autistic profile mean for their life?

What Happens After an Autism Diagnosis?

There is no single correct next step.

For some adults, diagnosis brings substantial relief and provides a framework for experiences they have struggled to understand.

Others experience a more complicated mixture of validation, uncertainty, grief, curiosity, or concern.

Practical recommendations might involve:

  • workplace accommodations;
  • post-secondary accommodations;
  • sensory modifications;
  • executive-functioning supports;
  • psychological therapy adapted to the person’s needs;
  • communication or relationship strategies;
  • addressing co-occurring ADHD, anxiety, depression, or other conditions;
  • community resources;
  • disability-related supports where appropriate; or
  • simply learning more about autism and reconsidering previous experiences through a different framework.

Recommendations should reflect the individual, not simply the diagnostic label.

How Should I Prepare for an Adult Autism Assessment?

You do not need to study for it.

In fact, trying to learn the “correct” autistic responses to assessment questions is unlikely to help the clinician understand you accurately.

It can be useful to bring or think about:

  • what first led you to consider autism;
  • examples from childhood and adulthood;
  • previous psychological or psychiatric assessments;
  • school reports if readily available;
  • relevant medical or developmental records;
  • previous diagnoses;
  • current medications;
  • significant mental health history; and
  • the questions you most want the assessment to answer.

If childhood records or family informants are unavailable, tell the clinician. That is a common reality in adult assessment and can be considered when interpreting the available evidence.

Choosing an Adult Autism Assessor

Before booking, it is reasonable to ask a psychologist:

  • How much of your assessment work involves autistic adults?
  • How do you assess developmental history?
  • Which standardized tools do you use, and how do you decide which are appropriate?
  • How do you consider masking?
  • How do you distinguish autism from ADHD, anxiety, OCD, trauma, and other conditions?
  • What happens if standardized measures produce conflicting results?
  • Is collateral information required?
  • What happens if no parent is available?
  • Is a comprehensive report included?
  • Is feedback included?
  • What is the total expected cost?
  • What is the typical timeline?
  • What happens if the assessment does not support autism?

In Alberta, psychology is a regulated profession. Adults considering assessment can verify a psychologist’s registration through the College of Alberta Psychologists.

Adult Autism Assessment in Calgary

If you are considering assessment locally, our main guide to adult autism assessments in Calgary covers diagnosis, costs, choosing an assessor, and practical considerations.

If you are earlier in the process and wondering whether autism might explain some of your experiences, start with signs of autism in adults.

Adults interested in how autism may be overlooked in some women can also read autism in adult women.

For one example of a Calgary assessment service, Solasta Counselling provides comprehensive adult autism assessments. Its current process includes individualized selection of assessment tools, clinical and developmental interviewing, diagnostic integration, a comprehensive report, and feedback.

Clinical content by Scott McKirdy, MC, Registered Psychologist
Scott McKirdy is a registered psychologist in Calgary who conducts comprehensive adult autism and ADHD assessments. He is Co-Owner and Operations Director at Solasta Counselling.

Last reviewed: August 2026