Diagnosing Autism in Adults with Intellectual Disability: Validation of the DiBAS-R in an Independent Sample.

Manuel and his team tested the DiBAS-R. It is a 19-item caregiver checklist for autism in adults with intellectual disability (ID).

They gave the screener to the caregivers. Each adult also received a full gold-standard autism assessment. The team compared the two results to see how well the screener worked.

Overall, the DiBAS-R caught 82 out of the adults who truly had autism. It wrongly flagged 33 out of the adults who did not have autism.

The tool worked best for mild-moderate ID: it caught 79 % and wrongly flagged only 16 %. For severe-profound ID, it still caught 85 %, but wrongly flagged 66 %.

Derks et al. (2017) tested the SCQ-AID, another short caregiver screener. Both studies found the same sensitivity near 0.81–0.82. Both also showed modest specificity. The pattern is clear: brief tools flag possible autism, but you must follow up.

Roman-Urrestarazu et al. (2021) shortened the Q-CHAT for toddlers. Like Manuel, they proved a lean checklist can keep the same hit rate. Age and setting differ, yet the theme repeats: fewer items can still screen effectively.

Bhaumik et al. (2008) showed that behavior disorders and autism are the top psychiatric diagnoses in adults with ID. Manuel’s tool gives you a quick way to spot the autism slice of that pie before referral.

If you serve adults with mild-moderate ID, the DiBAS-R is a 5-minute gatekeeper you can trust. Score it during intake; a low score makes autism unlikely, so you can focus on other targets. A high score still needs a full assessment, but you will not miss many true cases. For severe-profound ID, expect more false alarms—use extra clinical judgment or pair with observation. Either way, you now have data to justify your next step to funders and families.