Q-CHAT/POSI

It is an Autism specific screen that has been shown in 18-month-olds to be significantly more sensitive (0.62 vs. 0.48) but just as specific (o.82 vs 0.81) and no different in positive predictive value PPV (0.37 vs 0.32) than the M-CHAT even with a follow-up interview. It does not require a follow-up interview. Because of the low PPV positives might benefit from another screen at 20 months.

 

18 month check up visit. 16 – 20 months.

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