Autism Diagnosis

Overview

There is no medical autism test, like a blood test, to diagnose autism spectrum disorder (ASD). Instead, experienced medical professionals examine a person’s developmental history and behavior, interview and observe the person and their loved ones, and use professional screening and diagnostic tools to make a diagnosis.

If you’ve noticed some early signs of autism in your child speak to your child’s pediatrician as soon as possible. Your doctor will likely recommend a diagnostic test.

Your child’s testing should be done by someone who has experience working clinically with children with ASD. They should be trained and certified to conduct any measurements.

If you have concerns about your child’s development

We encourage you to get your child screened promptly. You can request an autism screening anytime from your child’s doctor.

Meanwhile, you can complete the Modified Checklist for Autism in Toddlers-Revised (M-CHAT-R™). It takes just a few minutes to assess the likelihood of autism. And you can take the results to your doctor.

Talk with your healthcare provider. Screening doesn’t diagnose autism. It flags behaviors often associated with the condition. After screening, your doctor can refer you to a specialist for a diagnostic evaluation. Importantly, you don’t need to wait for a diagnosis for your child to receive services.

parents

Using Milestone to track your Child’s development

Parents can benefit from understanding important developmental milestones as their child grows. These milestones help parents and caregivers see how their child is developing compared to other children of the same age. Tracking your child’s development can help you notice early signs if something is not developing as expected. By paying attention to these milestones, you can better support your child’s learning, communication, and daily skills, and ensure they receive the help they need to grow and succeed.

Your Child’s First 18 Months

By 2 months old, your child should be:

  • Looking at your face
  • Smiling when you talk to, smile at, or walk up to them
  • Easily looking at faces and object that are near them
  • Able to orient toward your voice and change what is being done in response to a caregiver or adult
  • Exploring their body by touching and mouthing
  • Moving both arms and both legs

By 4 months old, your child should be:

  • Smiling and laughing when you make a silly sound or a toy makes a fun noise
  • Looking at you, moving, or making sounds to get or keep your attention
  • Making sounds back when you talk to them
  • Looking at hands with interest
  • Able to hold a toy when you put it in their hand
  • Pushing up onto elbows/forearms when on tummy

By 6 months old, your child should be:

  • Looking at themself in the mirror
  • Laughing
  • Shifting their attention from you to an object and back to you
  • Blowing “raspberries” (sticks tongue out and blows)
  • Reaching to grab a toy they want
  • Rolling from tummy to back

By 9 months old, your child should be:

  • Showing several facial expressions, like happy, sad, angry, and surprised
  • Looking when you call their name
  • Making different noises with their mouth and make different sounds
  • Banging two things together
  • Sitting without support

By 1 year old, your child should be:

  • Waving “bye-bye”
  • Calling a parent “mama” or “dada” or another special name
  • Using gestures like showing and pointing to get you to notice what they are interested in
  • Able to follow simple directions like “come here” or “give it to me” when prompted with gestures
  • Pulling up to stand
  • Drinking from a cup without a lid, as you hold it

Your Child at 18 – 30 Months

Between 18 and 24 months, the symptoms of autism become apparent enough that a definitive diagnosis is possible. If your child is not meeting these milestones, you need a formal evaluation by an expert clinician.

By 15 months old, your child should be:

  • Clapping when excited
  • Able to communicate to get your attention and check in with you regularly
  • Looking at a familiar object when you name it
  • Using at least 5 different words that mean something
  • Trying to use things the right way, like a phone, cup, or book
  • Stacking at least two small objects, like blocks
  • Taking a few steps on their own

By 18 months old, your child should be:

  • Pointing to show you something interesting
  • Putting hands out for you to wash them
  • Using at least 10 different words that mean something
  • Copying you doing chores, like sweeping with a broom
  • Walking without holding on to anyone or anything
  • Climbing on and off a couch or chair without help
Your Child at 2 – 5 Years

By 2 years old, your child should be:

  • Noticing when others are hurt or upset, like pausing and looking sad when someone is crying
  • Looking at your face to see how to react in a new situation
  • Able to talk with you about a topic they are interested in like they are having a conversation
  • Able to use at least 100 words in phrases that include names, actions, and descriptions
  • Kicking a ball
  • Running
  • Walking (not climbing) up a few stairs with or without help

By 30 months old, your child should be:

  • Playing next to other children and sometimes playing with them
  • Showing you what they can do by saying, “look at me!”
  • Naming things in a book when you point and ask, “What is this?”
  • Saying words like “I,” “me,” or “we”
  • Following two-step instructions like “Put the toy down and close the door”
  • Taking some clothes off by themselves, like loose pants or an open jacket

 

Many children are diagnosed between 3 and 4 years of age, and many parents report feeling concerned even earlier. If your child is not meeting these milestones, contact your local school district to discuss early intervention

By 3 years old, your child should be:

  • Talking well enough for others to understand, most of the time
  • Able to draw a circle, when you show them how
  • Putting some clothes on by themself, like loose pants or a jacket
  • Using a fork
  • Joining other children in play
  • Saying their first name when asked

By 4 years old, your child should be:

  • Pretending to be something else during play (teacher, superhero, dog)
  • Comforting others who are hurt or sad, like hugging a crying friend
  • Telling what comes next in a well-known story
  • Serving themself food or pouring water, with adult supervision
  • Unbuttoning some buttons

By 5 years old, your child should be:

  • Singing, dancing, or acting for you
  • Telling a story they heard or made up with at least two events. For example, a cat was stuck in a tree and a firefighter saved it
  • Writing some letters in their name
  • Hopping on one foot
 Who can Diagnose?

When getting an autism diagnosis for your child, it’s important to obtain an evaluation by health care professionals who are experienced in identifying autism spectrum disorder (ASD) across a range of ages and symptom severity. It would be helpful to find someone who has evaluated hundreds of individuals, not just a few here and there.

Ideally, the team should include a medical specialist such as a developmental pediatrician, psychiatrist or neurologist. In addition, it should include a psychologist with expertise in diagnosing autism, a speech-language pathologist and possibly an occupational therapist.

Autism Levels – Understanding Support Needs

Autism presents differently in each person. These levels describe the amount of support needed, not a person’s value or potential.

Level 1 – Needs Some Support

Challenges:

  • Difficulty starting or keeping conversations
  • Shy or misunderstands social cues
  • Upset by small changes in routine
  • Sensitive to noise, lights, or textures
 Support Tips:
  • Step-by-step social skills teaching
  • Clear instructions and routines
  • Quite space for focus
  • Emotional encouragement

Level 2 – Needs Substantial Support

Challenges:

  • Limited or unusual speech
  • Struggles with social interaction
  • Repetitive behaviors affecting daily life
  • Strong dislike of changes
  • Sensory issues

Support Tips:

  • Structured teaching and clear routines
  • Support communication with pictures, gestures, or simple speech
  • Prepare the child for changes
  • Extra support at school and home

Level 3 – Needs Very Substantial Support

Challenges:

  • Very little or no spoken language
  • Severe difficulty communicating
  • Strong repetitive behaviors or strict routines
  • Strong sensory sensitivities
  • Difficulty with daily activities (dressing, eating, hygiene)

Support Tips:

  • Daily, consistent support
  • Alternative communication: pictures, sign language, or devices
  • Highly structured routines
  • Support with daily tasks and safety
  • Collaborate with teachers, therapists, and health workers