Baby · Development
ASQ-3 Developmental Screen
Ages & Stages Questionnaires, 3rd edition (Squires & Bricker 2009) — AAP Bright Futures preferred parent-report developmental screen across 5 domains. 21 age-specific questionnaires from 1 to 66 months.
Last reviewed 25 May 2026
ASQ-3 — Ages & Stages Questionnaires, 3rd ed.
Parent-completed developmental screening
About this page
ASQ-3 is a copyright-protected commercial instrument from Brookes Publishing — we describe the framework but do not reproduce the questionnaire items. The official ASQ-3 is the appropriate tool for actual developmental screening.
agesandstages.comThe 5 ASQ-3 domains
Communication
Receptive and expressive language: cooing, babbling, words, sentences, following directions.
6 items per domain × 21 age-specific questionnaires (1, 2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 33, 36, 42, 48, 54, 60 months).
Visit ages covered
1 mo2 mo4 mo6 mo8 mo9 mo10 mo12 mo14 mo16 mo18 mo20 mo22 mo24 mo27 mo30 mo33 mo36 mo42 mo48 mo54 mo60 mo
How scoring works
- Each item answered "Yes" (10), "Sometimes" (5), "Not yet" (0)
- Each domain scored 0-60 (6 items × max 10)
- Compared to age-specific cutoffs (mean − 2 standard deviations)
- Below cutoff in a domain → refer for further evaluation
Educational tool only — not medical advice. ASQ-3 is the AAP Bright Futures preferred developmental screening instrument at the 9, 18, and 30-month well-child visits. Performance: sensitivity 75-83 %, specificity 78-86 %, NPV 98 %. Used in > 100 countries. Should be administered by a healthcare team, not self-administered for diagnostic purposes. For a free 12-domain milestone tracker, see our /calculators/milestone-tracker page (CDC LTSAE 2022).
What does this mean?
The ASQ-3 (Brookes Publishing, Squires & Bricker) is the AAP Bright Futures preferred screening instrument for developmental delay at the 9, 18, and 30 month well-child visits (with extra age-specific versions across 1–66 months). It samples 5 developmental domains via age-appropriate yes/sometimes/not-yet questions a parent or carer can complete in ~10–15 min. Performance: ~80 % sensitivity and specificity, very high negative predictive value (~98 %). A “below cut-off” result is a SCREEN, not a diagnosis — it triggers referral to early intervention services for a developmental evaluation (in the US, your state’s IDEA Part C programme). Earlier identification matters: studies repeatedly show that early intervention before age 3 in language, motor, and social domains improves long-term outcomes measurably. This page is a descriptive guide — we don’t reproduce the proprietary items; obtain ASQ-3 from your paediatrician or via agesandstages.com.
Introduction
ASQ-3 is the most widely-used parent-report developmental screen worldwide. Developed by Diane Bricker and Jane Squires at the University of Oregon, published by Brookes Publishing (Squires & Bricker 2009). The AAP Bright Futures preferred screening instrument at the 9, 18, and 30-month well-child visits.
The 5 ASQ-3 domains
- Communication — receptive and expressive language.
- Gross motor — whole-body movements.
- Fine motor — hand and finger skills.
- Problem-solving — cognitive skills, learning, memory.
- Personal-social — self-help and social skills.
21 age-specific questionnaires
Coverage from 1 to 66 months at: 1, 2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 33, 36, 42, 48, 54, 60 months. Each questionnaire has 30 items (6 per domain). Parents complete in 10-15 minutes; clinicians score in 2-3 minutes.
Scoring
- Each item: Yes (10), Sometimes (5), Not yet (0).
- Each domain: 0-60.
- Compared to age-specific cutoff (mean − 2 standard deviations).
- Below cutoff in a domain → referral for further evaluation.
Performance
- Sensitivity 75-83 %.
- Specificity 78-86 %.
- NPV 98 %.
- AUC ~0.85 for developmental delay.
- Validated in 100+ countries.
When and where ASQ-3 is used
- AAP Bright Futures — 9, 18, 30-month well-child visits.
- US Early Intervention (Part C of IDEA) eligibility screening.
- Head Start / Early Head Start enrolment.
- Many international primary-care and community paediatric programmes.
ASQ-3 vs other developmental tools
- ASQ-3 — broad 5-domain screen, ages 1-66 mo.
- M-CHAT-R (link) — autism-specific, ages 16-30 mo.
- CDC LTSAE milestones (link) — free surveillance checklist, 2 mo - 5 yr.
- PEDS (link) — concern-based screen.
How to access
ASQ-3 is a copyright-protected Brookes Publishing product. Available for purchase from agesandstages.com. Some US state Early Intervention programs distribute it free to enrolled families. Some health systems have site licences.
Limitations
- Commercial — requires purchase / licence for clinical use.
- Parent literacy and comfort with the questionnaire affect responses.
- Cultural validity varies by translation; some items don’t map perfectly across cultures.
- Educational — actual screening should be performed in a clinical setting with appropriate follow-up.
Sources
- Squires J, Bricker D. Ages & Stages Questionnaires, Third Edition (ASQ-3): A Parent-Completed Child Monitoring System. Brookes Publishing 2009.
- American Academy of Pediatrics. Bright Futures Periodicity Schedule.
- Lipkin PH, et al. AAP Council on Children with Disabilities. Promoting Optimal Development: Identifying Infants and Young Children With Developmental Disorders Through Developmental Surveillance and Screening. Pediatrics 2020.
Frequently asked questions
What is ASQ-3?
Ages & Stages Questionnaires, 3rd edition — a 21-questionnaire parent-report developmental screening tool covering ages 1 to 66 months. Each questionnaire has 30 items across 5 domains. Developed by Diane Bricker and Jane Squires at the University of Oregon, published by Brookes Publishing (Squires & Bricker 2009). The AAP Bright Futures preferred screening instrument at the 9, 18, and 30-month well-child visits.
What does ASQ-3 measure?
Five domains: Communication (receptive + expressive language), Gross motor (whole-body movements), Fine motor (hand and finger skills), Problem-solving (cognitive), Personal-social (self-help + social skills). Each domain has 6 items scored Yes / Sometimes / Not yet (10/5/0 points). Each domain scores 0-60. Compared to age-specific cutoffs (mean − 2 standard deviations).
How accurate is it?
Sensitivity 75-83 %, specificity 78-86 % across multiple validation studies. Negative predictive value 98 %. AUC ~0.85 for identifying children with developmental delay. Validated in over 100 countries and translated into many languages. Performance is consistent with other validated developmental screens; the convenience of parent-report makes it widely used.
When is ASQ-3 used?
Universal screening at AAP-recommended well-child visit ages (9, 18, 30 months), plus at any visit if a concern is raised. Can also be used: by Early Head Start / Head Start programs for enrolment; by Early Intervention systems for eligibility screening; by paediatric practices as part of developmental surveillance. Takes parents 10-15 minutes; takes clinicians 2-3 minutes to score.
What if my child screens positive?
A positive screen warrants further evaluation. Next steps: (1) Talk to your paediatrician about the specific concerns. (2) Referral to Early Intervention (US Part C of IDEA, under-3s) or local equivalent. (3) For older children, referral to school-based services or community paediatric assessment. (4) Diagnostic evaluation if indicated — developmental paediatrician, paediatric neurologist, child psychologist. Many positive screens are followed by reassuring detailed evaluations; some lead to early intervention that significantly improves outcomes.
ASQ-3 vs M-CHAT-R vs CDC milestones?
Different tools for different purposes. ASQ-3 is a BROAD developmental screen across 5 domains, validated for ages 1-66 months. M-CHAT-R is AUTISM-specific, validated for 16-30 months, asks about specific autism-related behaviours. CDC milestones (LTSAE 2022) are a free developmental SURVEILLANCE checklist — not a formal screen. AAP recommends: M-CHAT-R + ASQ-3 (or equivalent) at 18-month visit; M-CHAT-R at 24 months; ASQ-3 at 30 months. CDC milestones throughout. These are complementary.
Where can I access ASQ-3?
ASQ-3 is a copyright-protected product of Brookes Publishing. Available for purchase from agesandstages.com. Some U.S. state Early Intervention programs distribute it free to enrolled families. Some healthcare systems have site licences. The official version (paper or online) is required for clinical use; informal reproductions don't have validated scoring.
What's the difference between screening and surveillance?
Developmental surveillance = ongoing observation across visits, asking about concerns, recording milestones, monitoring trajectory. Done at every well-child visit. Developmental screening = formal validated questionnaire (ASQ-3 or equivalent) at specific ages. AAP Bright Futures recommends both — surveillance throughout, screening at 9, 18, 30 months. The CDC LTSAE milestone tracker is a surveillance tool; ASQ-3 is the corresponding screening tool.