There are several instruments that are available. There are assessments that involve direct observation such as the autism diagnostic observation schedule (ADOS), inteviews such as the autism diagnostic interview revised (ADI-R), and rating forms such as the social responsiveness scale (SRS-2) and Autism spectrum rating scales (ASRS)
Here are some articles that summarize more diagnostic methods:
Penner, M., Anagnostou, E., Andoni, L. Y., & Ungar, W. J. (2018). Systematic review of clinical guidance documents for autism spectrum disorder diagnostic assessment in select regions. Autism, 22(5), 517-527.
Hayes, J., Ford, T., Rafeeque, H., & Russell, G. (2018). Clinical practice guidelines for diagnosis of autism spectrum disorder in adults and children in the UK: a narrative review. BMC psychiatry, 18(1), 1-25.
Internationally, M-CHAT revised is a screening questionnaire. Later detailed assessment can be done by Mental Health Professionals. This is also true in India.
Sim, há vários instrumentos de identificação (rastreio) que são utilizados para identificação do TEA na infância, um exemplo é o Modified Checklist for Autism in Toddlers - M-Chat.
The Autism Diagnostic Observation Schedule is an assessment used to indicate Autism Spectrum Disorders. The assessment is multiple interactional tasks that are developmentally appropriate for the individual being tested. The assessment requires rating individuals in various areas related to autism. Individuals should engage in extensive training before considering themselves qualified to administer this assessment.