Free Autism Screening Test for Children

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What Does the Screening Assess?

The screening asks you to reflect on your child's behaviour across six key developmental domains. You do not need any clinical training to answer — the questions are written in plain language and based on everyday situations.

How This Differs from M-CHAT and Other Tools

The M-CHAT (Modified Checklist for Autism in Toddlers) is the most widely used screening tool for young children, but it was designed for ages 16–30 months and focuses primarily on observable behaviours visible to parents. It can miss children who mask well, who are verbal, or who are older than the target age range. Many autistic traits — particularly in girls and children who are intellectually able — do not present in ways the M-CHAT is designed to capture.

AskSheldon's screening goes beyond binary yes/no questions to explore patterns across social communication, sensory processing, play, and emotional regulation. It accounts for the fact that many children — especially girls and those who are intellectually able — learn to mask autistic traits early, leading to missed or delayed diagnosis. This adaptive approach helps identify children who would score “not at risk” on the M-CHAT but who may still benefit from evaluation.

When Should You Screen Your Child?

There is no single “right” age to screen, but certain signs tend to become more noticeable at different stages. Many parents first notice differences around 18 months to 3 years, when social and communication milestones become more apparent. Older children — particularly girls and those who mask well — may not raise concerns until school age or later.

If your child seems to struggle with social situations, has intense interests, finds change distressing, or responds unusually to sensory input, screening is a reasonable next step. Trust your instincts — you know your child better than anyone.

For a detailed breakdown of signs by age group, see our guide on autism signs in children.

What Do the Results Mean?

The screening produces a likelihood score across the six domains listed above. A higher score in a domain means your child's behaviour in that area is more consistent with autistic traits. This is not a diagnosis — it is a structured snapshot of your observations.

Low likelihood means the screening did not identify many traits in that area, but does not rule anything out. Some children present differently in familiar vs unfamiliar environments, and a screening completed at home may not capture what a teacher sees at school.

High likelihood means several traits were identified and a conversation with your GP or paediatrician is recommended. Many families find it helpful to bring the downloadable report to that appointment.

Next Steps After Screening

If the screening suggests your child may benefit from further evaluation, here are the most common next steps in the UK:

• Speak to your GP — share the screening results and ask for a referral to your local autism assessment pathway. NHS waiting times vary, so getting on the list early matters.
• Contact your health visitor — for children under 5, health visitors can initiate developmental reviews and referrals directly.
• Talk to the SENCO at school — the Special Educational Needs Coordinator can arrange in-school observations and support while you wait for a formal assessment.
• For a complete walkthrough of the diagnostic process, read our parent's guide to diagnosis.

Frequently Asked Questions

AskSheldon provides screening and educational support, not formal diagnoses. Always consult a qualified healthcare professional for clinical evaluation. Last updated: March 2026.