top of page

ASQ-3 vs. SWYC vs. PEDS: Which Screening Tool is Best?

You've probably heard of "developmental screening," but what does it actually entail? How often should your child be screened? What does screening look for?

This article will seek to briefly explain the importance of screening and introduce the three primary types of screening tools used by healthcare providers and childcare professionals today.

In this article:

What is “screening”?

Why is developmental screening so important for young children?

Brain growth

Early intervention

Parent engagement in child development

How does screening work?

Administration of developmental screenings

Types of screening tools

1. ASQ-3



Comparing ASQ-3, SWYC, and PEDS screening tools

Accuracy of Developmental Screening Tools

Final verdict

What is “screening”?

Screening is used by medical professionals to detect potential health conditions in people who do not yet show any symptoms. It allows them to quickly and easily assess risk and identify who requires more comprehensive follow-up, such as additional testing.

The type of widespread screening done in early childhood is known as developmental screening. Developmental screening refers to a formal assessment of the milestones that a child has achieved at a very specific point in time, which provides important insights into how the child is developing, where they might need additional help, and what might come next.

The American Academy of Pediatrics (AAP) recommends every child be screened five times before the age of three for developmental health, including Autism.

Unfortunately, most primary care providers are not following through–nationally, developmental screening rates are an abysmal 17%.

Why is developmental screening so important for young children?

Brain growth

The first five years after your child’s birth are particularly crucial to their health, well-being, and the overall trajectory of their life. In fact, 90% of your child's brain develops by age five. This is the time when the foundations for future learning, health, and behavior are established.

During these 5 years, your child will achieve hundreds of developmental milestones–tasks or skills that most children can do by a certain age. Generally, children achieve milestones in a set pattern: for example, they crawl, then stand, then walk.

Developmental milestones are a way of tracking a child's development and making sure that they are progressing normally. If a child has not reached a specific milestone by a certain age–for example, if they have not said a single word by 12 months–it suggests that there could be a concern in that area and follow-up is warranted.

Pathfinder Health divides child and baby milestones into four major developmental domains:

(1) movement,

(2) social and emotional,

(3) language, and

(4) cognitive

Other sources sometimes divide these developmental domains differently, so don’t be confused if you’ve seen a slightly different version elsewhere.

Each one of these areas is equally important in helping your child reach full developmental maturity.

Early intervention

While developmental delays may sound scary, it's important to remember that early intervention and proper support provide many benefits for infants and toddlers with developmental delays or disabilities and can even change your child's developmental path.

Early intervention services can help your young child learn the skills they need to be successful in school and life, reducing the need for more costly special education and related services later on.

The key is to identify concerns as early as possible.

Parent engagement in child development

Screening is not just about detecting developmental delays–it’s also about tracking developmental milestones and celebrating your child’s accomplishments!

It’s exciting to know that your child is achieving milestones and fun to understand why those milestones are so significant to their future development.

If you would like more information about the significance of particular milestones as your child achieves them, visit the Pathfinder Help app and begin tracking your child's progress!

> Related: How To Help Your Child Reach Their Full Potential: The PROE Framework

How does screening work?

Administration of developmental screenings

For the most part, parents can complete screening questionnaires (at home, in a doctor's waiting room, or as part of an in-person or phone interview).

The questionnaires can also be completed by a caregiver or teacher. Healthcare professionals then score the questionnaires.

Types of screening tools

There are only three screening tools validated by the American Academy of Pediatrics—the ASQ-3, SWYC, and PEDS.

All are relatively quick to complete (under 15 minutes) and easy to score.

As we describe below, there are pluses and minuses to each and different providers may use or recommend different screening tools. If you have any questions or concerns about the type of screening instrument used or the results of any screening, speak with your child's healthcare provider.


The Ages and Stages Questionnaire Version 3 (“ASQ-3”) is a series of 21 individual age-specific questionnaires that cover five areas of child development: communication, gross motor, fine motor, problem-solving, and personal-social.

Physicians generally administer the ASQ-3 at every well-child visit from 1 to 66 months (although Medicaid restrictions may limit how frequently it can be given).

To conduct the screening, the healthcare provider asks the parent whether their child does or does not do a certain task or skill and assigns points depending on their response (5 points for “sometimes,” 10 points for “always,” and 0 for “never”).

The healthcare provider then uses the total points to determine if the child's development appears to be on schedule, in the monitoring zone, or below the cutoff (meaning that follow-up is suggested).

ASQ-3 is recommended by the American Academy of Pediatrics.


The Survey of Well-being of Young Children ("SWYC") is a comprehensive screener for children under 5 years of age that features separate forms for every age on the pediatric well-child visit schedule.

The SWYC age forms include separate sections relating to three primary areas of child development: developmental milestones, behavioral and emotional development, and family risk factors.

The forms for certain ages also feature a special screening for autism. On each form, parents respond "Not at all/Not Yet" (0 points), "Somewhat" (1 point), or "Very Much" (2 points). Each section has its own point threshold that indicates whether a child is “at risk” and should be further evaluated.

SWYC is recommended by the American Academy of Pediatrics. It is available online ONLY in the Pathfinder Health app.


The third approved screening tool is the Parents' Evaluation of Developmental Status (“PEDS”). The PEDS is designed for children ages 0 to 8 years and covers expressive and receptive language, gross and fine motor skills, behavior, self-help, and school and social skills.

The questionnaire uses the same 10 questions across the entire age range and was specifically designed to be more open-ended in order to elicit parents’ concerns about their child’s development, behavior, and mental health.

Questions ask about concerns in certain areas and the parent circles "No," "Yes," or "A Little" and adds comments where necessary.

The scoring form for PEDS identifies the concerns that predict developmental problems and provides evidence-based guidance on next steps.

PEDS is recommended by the American Academy of Pediatrics.

Comparing ASQ-3, SWYC, and PEDS screening tools




Child age

1-66 months

2-60 months

Birth to 8 years


21 age-specific questionnaires

12 age-specific forms on the well-child visit schedule; each form includes separate sections related to developmental milestones, behavioral/emotional development, and family risk factors. Certain ages also include an autism screening section.

One questionnaire is administered to all ages containing 10 open-ended questions designed to elicit and address parents’ concerns.

Developmental domains​

ASQ-3: Communication, gross motor, fine motor, problem solving, and personal/social

ASQ-SE-2: self-regulation, compliance, adaptive functioning, autonomy, affect, social communication, and interaction with people

Cognitive, language, motor, behavior, social-emotional interaction

Expressive language, receptive language, fine motor, gross motor, social/emotional, self-help, academics (older children)

Sample question

Does your child stack a small block or toy on top of another one? (18-month questionnaire)

Does your child name at least 5 familiar objects – like ball or milk? (18 month developmental milestone form)

Do you have any concerns about how your child talks and makes speech sounds?

Parent input

The parent answers Yes, Sometimes, or Not Yet.

The parent indicates Not Yet, Somewhat, or Very Much.

In response to questions about concerns, the parent circles No, Yes, or A Little and adds comments.


The results clearly indicate whether to (1) evaluate the child further, (2) closely monitor the child, or (3) provide information to parents about the child’s strengths and recommend activities for healthy development

The results indicate whether the child should be referred for counseling and/or intervention and provide some options for immediate counseling and intervention.

PEDS “provides decision-making paths to aid in interpreting parents’ responses to questions.”

Time required

10-15 min to complete; 2-3 min to score

15 min or less

Approx. 2 min to administer and

score if healthcare provider interviews parent based on form

Adapted from ASQ Comparison Chart 2018

Accuracy of Developmental Screening Tools

A 2020 study tested the diagnostic accuracy of all 3 questionnaires using a pool of 1495 families.

This study determined that all three had trade-offs in highlighting developmental delays and weeding out false positives, but no single instrument was clearly superior to the others.

These results suggest that developmental screeners can provide valuable information to healthcare professionals, but by itself should not be relied on to provide definitive recommendations.

Instead, screening questionnaires should be considered only one element in a larger system of care.

Final Verdict

The main strength of the ASQ-3 is that it highlights results that fall in a “monitoring zone,” which helps to keep track of children who may be at risk of developmental delay but do not yet require intervention.