What is the correct statement about M-CHAT-R/F and autism?

• A. It confirms autism on a positive screen.
• B. It is used to diagnose all developmental delays.
• C. A positive screen indicates a definite autism diagnosis.
• D. A positive screen indicates increased risk and warrants further evaluation.

Answer: (D)

M-CHAT-R/F is a screening tool, not a diagnostic test. It’s used during toddler visits to flag children who may be at increased risk for autism and therefore should receive a more thorough evaluation. The Follow-Up portion helps clarify responses to reduce false positives, which is why a positive screen means there is increased risk and warrants further diagnostic assessment—not a definite diagnosis. A definitive autism diagnosis requires a comprehensive clinical evaluation, often with standardized diagnostic tools. It’s also not used to diagnose all developmental delays, since its purpose is specifically to screen for autism risk.