Who Can Diagnose Autism? These 6 Types of Professional

Autism spectrum disorder (ASD) is a developmental condition that can impact all aspects of life. Receiving a reliable diagnosis of ASD is life-altering, not only for the person receiving the diagnosis but for those who have relationships with that person too. Having a diagnosis can help all parties understand and support each other better as well as grant access to life-changing therapies.

Autism is a developmental disorder characterized by challenges in social skills, repetitive behaviors, and verbal and non-verbal communication. ASD is a spectrum, meaning the type of deficits and the severity of the symptoms can vary widely from one person to the next. Typically, an autism diagnosis will require a treatment plan that will last throughout the person’s life.

The positive effects of receiving therapy, specifically early intervention therapy, cannot be stressed enough. Receiving an early diagnosis is the first step in receiving early intervention services which are paramount to better outcomes, a more independent life, and more adaptive skills.

In this article, we will discuss the steps to take to obtain a diagnosis, who can diagnose ASD, and what steps to take after the diagnosis to help improve the autism prognosis.

Understanding Autism Spectrum Disorder

ASD is a developmental condition that is characterized by challenges with speech, non-verbal communication, and social interaction, as well as repetitive behavior and obsessive interests. People on the spectrum will require some level of ongoing support throughout their lifetime. Autism covers a wide spectrum of diverse symptoms, and it’s common to find multiple people sharing the diagnosis and presenting completely differently.

For an autism diagnosis, a person needs to reach a certain number of symptoms, which may be a completely different set of symptoms from the next person, varying both in symptom type and severity. For example, one person with ASD may have strong verbal communication skills but struggle with changes, while another may have limited speech but no issues with schedule changes.

Early and accurate diagnosis of autism followed by early intervention services is one of the most important predictors of autism prognosis. According to the CDC, autism can be detected at 18 months or younger. Typically, parents are the first to notice autism symptoms, with 80% of the cases of parents noticing signs at the age of 2 years old. The first symptoms of concern were a lack of eye contact, not responding to their name, not following a point and repetitive behaviors with or without objects.

Studies have shown children diagnosed and in early intervention before 24 months of age showed the most reduced ASD symptom severity and were more likely to be integrated into less restrictive environments than those who received no or late therapy, highlighting the importance of acting on an early diagnosis and beginning early intervention. Engagement in therapy has also been shown to improve family dynamics as a whole, with families receiving intervention showing less family dysfunction than those not in therapy.

The Diagnostic Process


Developmental monitoring is the continual process of monitoring your child’s development and comparing it against typical milestones. Areas to look out for include delays in playing, learning, speaking, behaving, and moving.

The CDC has developed a tool called “Learn the signs, act early” to help parents monitor their child’s development and milestones. If you notice your child falling a little behind on some of these milestones, talk with your pediatrician, doctor, or nurse about your concerns. At this point, doctors might begin developmental screening, which is sometimes part of a routine exam. The American Academy of Pediatrics recommends specific ASD screenings to occur at 18 and 24 months of age. The results of the screening may highlight areas of concern that would prompt a developmental evaluation to be conducted.

There are several different tools and methods used for assessing ASD. One of the most common assessments is the Autism Diagnostic Observation Schedule (ADOS). This is an activity-based assessment tool that can be administered as early as 12 months. During the ADOS, the clinician assesses the child’s communication, social interaction, and imaginative use of materials. The Autism Diagnostic Interview-Revised is another common tool used to diagnose autism. This tool involves a structured parent interview and covers social interaction, communication, and language, as well as restricted and repetitive movements.

It is important to keep in mind that, although both these tools are considered the “gold standard”, one assessment on its own may not be enough for an autism diagnosis, and a more comprehensive evaluation should take place. For a formal diagnosis, the child’s development, family history, parental and caregiver information, and behavioral observations outside of the formal assessment should all be considered. Moreover, including different professionals in the diagnosis process will help paint a full picture of the extent of the strengths and deficits of the child and will be useful in guiding toward effective interventions.

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Professionals Qualified to Diagnose Autism

Developmental Pediatricians

Often, developmental pediatricians are the clinicians who begin the process of obtaining an autism diagnosis. During routine checkups, pediatricians will monitor the progress the child is making towards their developmental milestones by direct observation and by interviewing the adults in the child’s life. If the child is showing early signs of a developmental delay, the pediatrician may suggest a more formal assessment to begin. They will examine the child’s habits, abilities, how they speak, play, etc. After the assessment, the pediatrician will provide a full report, including any diagnosis they identified. If autism is diagnosed, pediatricians will help to provide and guide caregivers toward a treatment plan.

If the diagnostician suspects there may be another co-morbidity that would require medical tests such as blood tests or brain scans, they will make a referral to other professionals in related fields to ensure all areas of concern are understood and treated.

Child Neurologists

A child neurologist is a doctor who treats children who have problems with their nervous system. As part of the assessment process, neurologists may conduct genetic testing, EEGs, and laboratory tests in addition to the screening tools to obtain a more specific and complete diagnosis. There is a strong link between brain neurology and ASD, including neural, structural, and functional differences in the brains of people with ASD.

Involving a child neurologist in the diagnosis of a child with autism can be helpful for several reasons. Medical comorbidities are more common in children with ASD than in the typically developing population. Neurologists can help identify and diagnose any comorbid conditions such as epilepsy, OCD, ADHD, bipolar disorder, etc. These conditions, untreated, can exacerbate the symptoms of autism. Having a dual diagnosis means each condition can be treated individually, by behavior and/or medical therapy, leading to improved outcomes.

Child and Adolescent Psychiatrists

Child and adolescent psychiatrists focus on diagnosing, treating, and preventing mental disorders in children, teenagers, and their families. Psychiatrists can be instrumental in helping to manage some of the more challenging mental health aspects of living with ASD. Autistic individuals exhibit higher than average rates of mental health disorders, which exacerbate the symptoms of autism. Thus, diagnosing and treating these conditions is essential to a better prognosis.

Typically, caregivers may decide to contact a psychiatrist if they feel that their child may be exhibiting more frequent bouts of loss of control, physical rages, including aggression towards themselves or others, screaming episodes, withdrawal, etc. Often, children won’t be able to describe what is happening to them, so it’s important for parents to clearly describe in objective terms what is occurring, starting with the most severe and challenging behaviors to help the psychiatrist with an accurate diagnosis.

After their assessments, psychiatrists can diagnose any co-occurring conditions, such as anxiety and depression, and prescribe appropriate medication and treatment.

Clinical Psychologists

Who can diagnose autism? Guide for parents

A clinical psychologist is a mental health professional who uses different assessments and tools to help children and adolescents better cope with different life issues. Clinical psychologists are also able to diagnose any comorbid conditions that may be present. For children with ASD, clinical psychologists are useful as they are highly trained in conducting behavior assessments, which examine a child’s behavior and how it correlates to their environment. These assessments help identify the function of certain challenging behaviors, when and why they occur, and what functional replacement could be taught instead.

The clinical psychologist will also identify the child’s learning style, such as visual, verbal, kinesthetic, etc, and create interventions to help teach skills where the child is showing the most deficits. These interventions can be shared with the child’s school team to help support the child across different settings.

Pediatric Neuropsychologists

A pediatric neuropsychologist studies the relationship between brain health and behavior in children. When assessing children with ASD, neuropsychologists carry out detailed analyses of cognitive functioning in people with ASD. These analyses highlight 5 key areas including intelligence, attention, executive function, social cognition, and praxis. Results from these analyses help to highlight the cognitive strengths of each child and underlying cognitive issues that could be worsening symptoms of autism. After their assessments, the neuropsychologist will provide caregivers with a detailed summary of the diagnoses present, strengths, weaknesses, and treatment plans based on these results.

Speech-Language Pathologists

As language and communication deficits are central characteristics of autism, speech-language pathologists are a key part of the team involved in diagnosing autism. Speech-language pathologists conduct assessments that include parent interviews, observations, and informal assessments through play and conversation. During these assessments, speech-language pathologists are identifying non-verbal communication skills, conversational skills, appropriate language skills, vocabulary and sentence structure, and understanding of language.

The results of the assessment are useful to guide the therapists toward making functional and specific goals for the child. Often, speech therapists become part of a multidisciplinary team working with a child and will collaborate with the school and home programs to promote the generalization of skills.

Choosing the Right Professional


When beginning the process of diagnosing ASD, choosing the correct diagnostician for your child is key as they may be part of your treatment team long term. Choosing someone with experience can help for multiple reasons. Firstly and most importantly, they will have assessed many children with ASD and will be able to identify common signs and symptoms. Furthermore, they will be more likely to have useful suggestions and contacts, in terms of parent support groups, social groups as well as other professionals. A more experienced diagnostician may also be more effective in terms of which direction to take the treatment. For example, including early intervention, occupational therapists, child psychologists, etc.

Including a team of various professionals in the diagnosis of your child will be key to accessing the most comprehensive and effective therapy. While there is a level of overlap between professionals, each specialist will be assessing and examining a different part of your child’s development and brain and will be creating targeted intervention plans to help provide the most support to your child.

Finding a diagnostician may feel overwhelming, but certain factors will help narrow down your choices. Firstly, ask your pediatrician for a referral for someone with experience with ASD. Joining parent support groups is also a useful way to connect and discuss with people in similar situations who may be able to provide some guidance in terms of choosing specialists. After you have a few referrals, check whether your insurance will cover the cost and whether the diagnostician is in your network. Once you have reached this stage, assess if there is a long waitlist. With ASD, as with most conditions, time is of the essence. The sooner the doctors can provide a diagnosis, the sooner the child will be able to begin treatment, leading to better outcomes.

After Diagnosis – What Next?

After the autism diagnosis is confirmed, treatment options should be explored without too much delay. The reason for this is early diagnosis and intervention are associated with more positive long-term effects on symptoms and skill acquisition. Applied Behavior Analysis (ABA) therapy is a commonly recommended treatment approach due to its strong evidence base for teaching functional and adaptive skills while reducing challenging behaviors associated with ASD. ABA is also helpful as there is a heavy focus on parent training and education which can help when first receiving an autism diagnosis. At the same time, your diagnostician may recommend speech and occupational therapy. Speech therapists will help to work on all areas of communication while occupational therapists will work on fine and gross motor skills as well as self-regulation strategies.

Receiving a diagnosis can take a mental and emotional toll. Knowing where to begin and who to turn to for support can be overwhelming, so it’s important to remember you are not alone. There are in-person or online support groups that can help with the practical and emotional sides of receiving an autism diagnosis.


Obtaining a diagnosis from the right professional is instrumental in helping to guide your child’s autism treatment. If you do not feel comfortable or supported, seek a second opinion until you find a doctor that you trust. This person should be a resource of information, so make sure you educate yourself and ask as many questions as possible to ensure your child is receiving the most effective intervention.

It takes a village to raise a child, and this may be even more true for a child with autism. Gather a strong team of professionals who can lend their expertise and support to help your child maximize their potential. If you have any concerns about your child’s development and milestones, do not hesitate to seek a diagnosis. As previously mentioned, your child’s best chances come from early intervention services, and any delays in treatment may be negatively impacting their future chances at a more independent life.

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