As your child enters their school years, social dynamics and communication expectations become much more complex. If you have noticed that your child struggles to connect with peers or adapt to new routines, you may be wondering if these behaviors are traits of autism. 

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The Childhood Autism Spectrum Test (CAST) is a widely recognized and scientifically validated screening tool designed to help parents identify autism spectrum traits in older children.

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Here is a factual, informational guide on what the CAST is, who it is for, and how you can access it to evaluate your child.

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For Whom is the CAST Designed?

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The CAST is clinically validated specifically for school-aged children between 4 and 11 years of age. It is tailored to older children who have surpassed early developmental milestones. (If your child is under 4 years old, the M-CHAT-R/F is the appropriate screening tool to use).

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What Does the CAST Assess?

Like the M-CHAT, the CAST is a "parent-report" questionnaire, meaning it relies entirely on your honest observations of your child's usual behavior in daily life, such as at the dinner table, during play, or when getting ready for school. You do not need a doctor present to fill it out.

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The assessment consists of 39 simple Yes/No questions (37 of which are scored) and typically takes about 15 to 20 minutes to complete. While toddler tests focus on basic interaction, the CAST evaluates more complex social skills and communication patterns, including:

• Peer Relationships: Does your child find it easy to interact with other children and make friends?
• Conversation Abilities: Can they keep a two-way conversation going, and do they take turns in conversation?
• Flexibility: Does your child become upset by minor changes, or do they impose routines on themselves or others in a way that causes problems?
• Specific Interests: Do they have an unusual memory for details, or interests that take up so much time they do little else?

What Do the Results Mean?

The CAST is a preliminary screening tool, not a formal medical or diagnostic instrument. The questionnaire is scored out of a maximum of 31 points.

• Standard Range (Score of 0–14): This indicates a low likelihood of autism spectrum traits. Parents are encouraged to continue monitoring their child's development as usual.
• At-Risk Range (Score of 15–31): A score in this range is above the clinical threshold. While this is not a diagnosis, it signifies a high likelihood of autism and serves as a strong indicator that a formal diagnostic referral and professional assessment (such as the ADOS-2) are needed.

Take the Next Step: Access the Tool

Understanding your child's social and communication style is the first step toward getting them the right educational and behavioral support. You can complete the questionnaire comfortably at home, and if your child scores in the at-risk range, it is strongly recommended that you share the results with your child's pediatrician or school's S

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