A parent-completed questionnaire screens development, not diagnoses

The play

The Ages & Stages Questionnaires, Third Edition, known as ASQ-3, is a set of paper or online forms a caregiver fills out about a child, published by Paul H. Brookes Publishing Co. The publisher's product page describes it as covering children from one month to five and a half years, split into 21 separate questionnaires timed to specific ages, including 2, 9, 18, 24, and 36 months. Each form takes about 10 to 15 minutes and asks concrete questions about everyday behavior, such as whether a baby picks up a small object between thumb and finger. A program or pediatric office is the usual administrator; the form itself is meant to travel home and come back filled in.

What the evidence says

The publisher's own description of how ASQ works lays out a workflow: complete, score against a printed cutoff, then discuss results with parents and determine next steps, including a suggestion of resources for follow-up, monitoring, or further assessment if needed. That phrasing matters: the site treats a scored questionnaire as a prompt for conversation and possible referral, not an endpoint. The product page also reports the tool's own sensitivity and specificity figures, meaning how often it correctly flags a delay and correctly clears typical development, which is the kind of performance statistic a screening instrument reports rather than a diagnostic one. Both figures come from the publisher's own materials, not an independent journal audit.

Age fit and safety

The stated age range is one month through 5.5 years, delivered through fixed-age intervals rather than one all-ages form. Nothing in the pages reviewed here claims a completed ASQ-3 constitutes a diagnosis; the language throughout is screening, flagging, and referral. Treating a screening score as a verdict, rather than one data point that may lead to a professional evaluation, risks either false reassurance or unwarranted alarm.

What to look for

This is an editorial checklist. Confirm which edition and language version a program uses, since intervals and items changed between editions. Ask what happens after a flagged score, since the publisher's own workflow treats that as a referral conversation, not a conclusion. Keep any single result in context: one questionnaire on one day is a snapshot, and the tool is meant to sit inside a caregiver-professional conversation, not replace one.

• Which specific ASQ-3 age interval is being used, and does it match the child's corrected age if relevant?
• What happens next if a score falls outside the expected range, and who explains that to the family?
• Is the screening result being treated as a conversation starter or as a final judgment about the child?

A screening tool earns its keep by starting the right conversation early, not by rendering a verdict. ASQ-3's own materials are consistent on that point, even where they also market the tool's speed and ease of use.