Autism (M-CHAT-R) Screening
Autism (M-CHAT-R) Screening
The Modified Checklist for Autism in Toddlers, Revised (M-CHAT-R) is the most widely used autism screening tool for children aged 16–30 months. Developed by Dr. Diana Robins and colleagues, it consists of 20 yes/no questions that parents complete in about 5 minutes. The American Academy of Pediatrics recommends universal autism screening at 18 and 24 months of age. The M-CHAT-R has a sensitivity of approximately 85% and specificity of 50–70%, meaning it correctly identifies most children with autism but also flags some children who do not have autism for further evaluation.
According to the CDC, approximately 1 in 36 children is identified with autism spectrum disorder (ASD). Early identification and intervention can significantly improve language, social, and cognitive outcomes. The M-CHAT-R is a screening tool — not a diagnostic instrument. A positive screen does not mean your child has autism, but it does mean further evaluation by a developmental specialist is needed.
M-CHAT-R Screening Tool
M-CHAT-R Autism Screening (20 items)
Please answer about how your child USUALLY behaves. If behavior is rare (happens once or twice), answer based on what usually happens.
Written by Dr. Emily Chen, MD (Pediatrics) | Medically approved by Dr. Ahmed Raza, MD (Pediatrics) | Updated for 2026
Disclaimer: This tool is for general informational purposes only and is not a substitute for professional medical advice. Always consult your pediatrician.
Pediatric clinical calculators are essential tools for healthcare providers, but understanding the underlying formulas, clinical context, and safety considerations is equally important. This Autism (M-CHAT-R) Screening provides fast, accurate calculations based on validated pediatric reference standards, but effective clinical use requires more than just entering numbers—it requires understanding when and how to apply the results in real patient care.
Clinical background and context
This tool is designed for use in clinical settings including emergency departments, pediatric wards, intensive care units, and outpatient clinics. Pediatric patients differ significantly from adults in pharmacokinetics, fluid requirements, growth patterns, and disease presentation. Reference ranges, formulas, and safety thresholds that work for adults often require adjustment for children based on weight, age, and developmental stage.
How to use this calculator effectively
- Gather accurate patient data: Weight should be measured on a calibrated scale, not estimated.
- Verify the formula being used: Confirm which standard your facility follows.
- Check for contraindications: Some calculations may need adjustment for renal impairment, cardiac disease, or other comorbidities.
- Document the calculation: Record the input values and result in the medical record for transparency and safety.
- Double-check critical values: For high-risk medications or interventions, always verify with a second clinician.
Safety considerations and limitations
While this tool is designed for accuracy, it should be used as part of a comprehensive safety protocol. Always apply clinical judgment, follow institutional protocols, and consult with qualified healthcare professionals when making patient care decisions.
