Identifying children with developmental disabilities is critical in providing early intervention services. This study aimed to evaluate the concurrent validity information of the 24-, 30-, and 36-month Indonesian Ages and Stages Questionnaires third edition (ASQ-3) with Bayley Scales of Infant and Toddler Development 3rd Edition (BSID-III) in Indonesian children. Children living in Tanah Tinggi subdistrict, Central Jakarta, within the 24-, 30-, or 36-month age group, were assessed for Indonesian ASQ-3 concurrently with BSID-III. Screening test accuracy was measured in sensitivity, specificity, and predictive values for both overall dan specific domains. A total of 131 children were included as study participants. Sensitivity, specificity, positive predictive value, and negative predictive value (NPV) for 24-, 30-, and 36- month ASQ-3 questionnaires were 80.6%, 69.5%, 50%, and 90.4%, respectively. Age-specific sensitivity and specificity were 72.7%–84.6% and 59.4%–79.4%, with accuracy increasing from 65.9% at 24-month to 77.8% at 36-month. The accuracy in detecting language delay (88.5%) is higher than cognitive delay (77.9%) and motor delay (64.1%). ASQ-3 overall and age-specific sensitivities were good enough, given they were above 70%. The 36-month questionnaire had the best accuracy. A high NPV supports using the ASQ-3 Indonesian version to exclude developmental delay.

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