The pre-linguistic autism diagnostic observation schedule.

The team built a short play-based test for toddlers who do not yet speak.

They called it the Pre-Linguistic Autism Diagnostic Observation Schedule, or PL-ADOS.

Clinicians watched kids play with toys for about 30 minutes and scored social and communicative acts.

The scores cleanly split autistic preschoolers from other delayed non-verbal children.

Inter-rater agreement was high, so different observers reached the same yes-or-no autism call.

Barthelemy et al. (1989) created the original ADOS for school-age children who could talk. The new PL-ADOS keeps the same idea but trims tasks and norms for kids without words.

Noterdaeme et al. (2002) and Zander et al. (2015) later showed that adding a parent interview like the ADI-R boosts accuracy. Their work extends this paper by showing two tools beat one, even though the PL-ADOS alone already works for tiny non-verbal kids.

van der Miesen et al. (2024) mined ADOS-2 non-verbal items and found five toddler profiles. That study extends PL-ADOS by revealing which scattered gestures most often slip past parent screens, so clinicians know what to watch for.

If you assess toddlers who point, babble, or speak in single words, the PL-ADOS gives a quick, reliable autism yes-or-no. Use it while the child plays with bubbles and cars; you will finish before snack time. Pair it with a parent interview when you can, but even alone it guards against long wait-lists and missed early intervention windows.