CAST Autism Screening for 6-Year-Olds
At 6, social interaction with peers becomes more complex and rule-governed. Group dynamics, classroom expectations, and the beginnings of close friendship formation can highlight differences in social communication that were less visible at home or in nursery.
- Questions
- 31
- Format
- Yes / No
- Time
- ~8 minutes
- Completed by
- Parent or caregiver
- Age range
- 4–11 years
About the CAST
Six-year-olds are typically developing close same-age friendships, showing awareness of social hierarchies, and becoming more skilled at reading others' emotional states. Collaborative and competitive games with rules are a central part of peer interaction at this age.
For children with autism traits, the increased social complexity of Year 2 often coincides with increasing difficulty. Children who are academically capable may mask well during structured lessons but struggle intensely during unstructured social time. The CAST can identify this pattern through its items on social engagement, imagination, and communication.
Source: Childhood Autism Spectrum Test — Baron-Cohen et al., Autism Research Centre, Cambridge
Frequently asked questions
- My 6-year-old is doing well academically but struggles in the playground. Is that significant?
- Yes. Good academic performance does not exclude autism. Many autistic children thrive in the structured predictability of classroom learning while finding unstructured peer interaction confusing or exhausting. The CAST specifically covers both academic and social domains and is sensitive to this pattern.
- My child has very intense interests and talks about them constantly. Is that a concern?
- Intense, focused interests are one of the autism traits the CAST assesses. In themselves they are not a problem — but when combined with differences in social reciprocity, communication, or imagination, they contribute to the overall profile. Completing the full CAST gives you a structured picture across all domains.
- What happens if my child screens at risk?
- A positive CAST result means enough traits are present to warrant professional follow-up. The recommended next step is a referral to a paediatric psychologist, developmental paediatrician, or specialist autism assessment service. Bringing printed results to your GP or school SENCO can support the referral conversation.
- Does a positive screen mean my child has autism?
- No. A positive screen is not a diagnosis. Many children who score above the CAST threshold do not receive an autism diagnosis after full evaluation. Only a qualified clinician conducting a comprehensive developmental assessment can diagnose autism spectrum disorder.
- How long does the CAST take?
- Most parents complete the 31 CAST items in 8 to 10 minutes. Your result with a score band and guidance is available immediately after the last question.
Free · Private · Results in under 15 minutes