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Ages and Stages Questionnaire ASQ developmental screening tool overview

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Ages Stages Questionnaire developmental screening

Here is a thorough overview of the Ages & Stages Questionnaires (ASQ):

Ages & Stages Questionnaires (ASQ)

What Is the ASQ?

The ASQ is a parent-completed developmental screening system developed at the University of Oregon. It is designed to identify children who may need further evaluation for developmental delays and to celebrate milestones in those developing typically. It is the most widely used developmental screening tool globally, and is recognized by the American Academy of Pediatrics (AAP) as a validated screening instrument.
There are two main versions:
VersionFull NamePurpose
ASQ-3Ages & Stages Questionnaires, 3rd EditionGeneral development across 5 domains
ASQ:SE-2Ages & Stages Questionnaires: Social-Emotional, 2nd EditionSocial-emotional and behavioral development

ASQ-3 in Detail

Age Range

  • 1 month to 5.5 years (66 months)
  • 21 age-specific questionnaires at these intervals: 2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 33, 36, 42, 48, 54, and 60 months

Five Developmental Domains (30 items total)

  1. Communication - language, listening, talking
  2. Gross Motor - sitting, walking, running, jumping
  3. Fine Motor - reaching, grasping, drawing
  4. Problem-Solving - playing with toys, task completion
  5. Personal-Social - self-care, interacting with others

How It Is Completed

  • Parents or caregivers answer 30 questions per questionnaire
  • Each item is scored: Yes = 10, Sometimes = 5, Not Yet = 0
  • Total domain scores fall into three zones:
    • Typical development (above cutoff)
    • Monitoring zone (close to cutoff - watch and rescreen)
    • Refer for further evaluation (below cutoff)

ASQ:SE-2 in Detail

Age Range & Intervals

  • 1 month to 72 months
  • 8 questionnaires at: 6, 12, 18, 24, 30, 36, 48, and 60 months

Seven Behavioral Areas

  1. Self-regulation
  2. Compliance
  3. Communication
  4. Adaptive functioning
  5. Autonomy
  6. Affect
  7. Interaction with people
The ASQ:SE-2 is meant to be used alongside ASQ-3, not as a standalone replacement.

Psychometric Properties

The ASQ-3 is backed by strong evidence. Per published data and a norming sample of over 15,000 children:
  • Test-retest reliability: 92%
  • Sensitivity: ~87.4% (detecting children with delays)
  • Specificity: ~95.7% (correctly identifying typically developing children)
A 2022 JAMA Pediatrics meta-analysis (PMID: 36036913) confirmed the ASQ's utility for identifying developmental delay in children aged 12-60 months, and a 2023 JAMA Child Psychiatry systematic review (PMID: 36592715) evaluated real-world accuracy of developmental screeners including ASQ.

When to Screen - AAP Recommended Schedule

The AAP recommends developmental screening at:
  • 9 months
  • 18 months
  • 24 or 30 months
Many programs also screen at every well-child visit from birth to 5 years.

Who Completes It?

A key strength of the ASQ is its parent-centric design:
  • Parents complete it at home, in the waiting room, or online - typically in 10-15 minutes
  • Questions use simple, plain language with illustrated activity suggestions
  • Available in multiple languages (Spanish, French, Korean, and many others)
  • Parents are treated as the experts on their child's behavior

How It Is Used

  1. Primary care / pediatrics - at well-child visits (the most common setting)
  2. Early intervention programs - to qualify children for services (e.g., Part C of IDEA in the US)
  3. Early childhood programs - required for NAEYC accreditation and quality rating systems (QRIS)
  4. Home visiting programs (e.g., Nurse-Family Partnership, Early Head Start)
  5. Neonatal follow-up clinics - especially for preterm or at-risk infants

What Happens After a Positive Screen?

A below-cutoff score is not a diagnosis - it is a signal for next steps:
  1. Refer for comprehensive developmental evaluation by a specialist (developmental pediatrician, neuropsychologist, speech-language pathologist, etc.)
  2. Connect to early intervention services (in the US, contact your state's Part C/619 program)
  3. Rescreen children in the monitoring zone in 2-3 months

Key Strengths vs. Limitations

StrengthsLimitations
Parent-completed - fast, low-costParent report can be influenced by literacy level or cultural norms
Strong sensitivity and specificityNot a diagnostic tool - only a screener
Available in many languagesMust select the correct age interval carefully
Validated across diverse populationsSome studies show lower sensitivity in community vs. clinical settings
Widely accepted by AAP and payersNot freely available - requires purchase or subscription
The official publisher's resource is agesandstages.com, where you can purchase questionnaires, access online scoring, and find training materials.
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