The Ages and Stages Questionnaire (ASQ) is a developmental screening tool that parents fill out to help identify whether a young child may need further evaluation for developmental delays. It covers children from 1 to 66 months old and takes about 10 to 15 minutes to complete. Rather than relying solely on a pediatrician’s brief observation during a checkup, the ASQ draws on what parents see their child doing every day at home.
What the ASQ Screens For
The current widely used version, the ASQ-3, evaluates five areas of development:
- Communication: how your child understands and uses language, from babbling to forming sentences.
- Gross motor: large movements like rolling over, crawling, walking, and jumping.
- Fine motor: smaller, precise movements like grasping objects, stacking blocks, or drawing.
- Problem solving: how your child figures things out, like finding a hidden toy or sorting shapes.
- Personal-social: self-help skills and social behaviors, such as feeding themselves, playing with others, or copying adult actions.
There is also a companion tool called the ASQ:SE-2 that focuses specifically on social and emotional development, covering things like self-regulation, compliance, and emotional expression. The two are often used together but serve different purposes.
How the Questionnaire Works
Each ASQ form is designed for a specific age window. You receive a questionnaire matched to your child’s age in months, and each one contains a series of simple, observable tasks or behaviors. For each item, you mark whether your child does the activity regularly, sometimes, or not yet. There are no right or wrong answers. The goal is to capture an honest picture of what your child is currently doing.
The whole thing takes 10 to 15 minutes. You can usually complete it at home before a well-child visit, in the waiting room, or through an online portal your pediatrician’s office provides. A professional then scores the responses and compares them against established cutoff points for each developmental area. If your child’s score falls below the cutoff in any domain, that signals the need for a closer look, not necessarily a diagnosis.
The ASQ-3 is available in English, Spanish, Arabic, French, and Vietnamese, making it accessible to a broader range of families.
When Screening Happens
The American Academy of Pediatrics recommends formal developmental screening at the 9-month, 18-month, and 30-month well-child visits. Autism-specific screening is recommended at 18 and 24 months. These aren’t the only times screening can happen. Pediatricians, parents, or early childhood professionals can request screening whenever a concern comes up, regardless of the child’s age.
Many pediatric offices and early intervention programs use the ASQ as their screening tool of choice at these visits because it’s quick, parent-driven, and well-validated. Some states also use it in home visiting programs and childcare settings.
How Accurate Is It?
No screening tool is perfect, and the ASQ is designed to cast a reasonably wide net. Studies have found that for children aged 27 to 36 months, the ASQ-3 correctly identifies about 86% of children who do have delays (sensitivity) and correctly identifies about 86% of children who are developing typically (specificity). For children aged 42 to 60 months, specificity climbs to about 92% while sensitivity stays around 83%.
Other studies have found slightly different numbers depending on the population and ages tested, with sensitivity generally ranging from 75% to 89% and specificity from 78% to 91%. The tool performs well as a first-pass screen, which is exactly what it’s meant to be. A below-cutoff score doesn’t mean your child has a developmental disorder. It means a more thorough evaluation by a specialist is a reasonable next step. Likewise, a passing score offers reassurance but doesn’t replace ongoing observation.
What Happens After Screening
If your child’s scores are above the cutoffs in all five areas, your pediatrician will typically continue routine monitoring at future visits. Some children score in a “monitoring zone” just above a cutoff, and in those cases your provider may suggest repeating the questionnaire in a few months to see how things progress.
If scores fall below the cutoff in one or more areas, the next step is usually a referral for a more comprehensive developmental evaluation. This might involve a developmental pediatrician, speech-language pathologist, occupational therapist, or psychologist depending on which domains were flagged. Early intervention services, which are available in every U.S. state for children under age 3, can often begin while further evaluation is still in progress.
The ASQ is specifically built to catch delays early, when intervention tends to be most effective. A child who gets speech therapy at 18 months, for instance, often has significantly better outcomes than one who starts at age 4.
What’s Coming in the ASQ-4
A fourth edition of the questionnaire is currently in development, though no publication date has been announced yet. The ASQ-4 will add a new 72-month questionnaire, extending coverage through the transition to kindergarten for the first time. The updated version will also use a new normative sample that better reflects the current U.S. population, with revised cutoff scores and updated questionnaire items based on user feedback from the years of ASQ-3 use.