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We can identify autism and its severity with meaningful accuracy within less than 10 minutes using a test that is completely nonverbal and entails no task to follow. This raises the hope that these findings could form the base for development of a diagnostic tool that can be applied very early on, such as in toddlers only a few months old. Such early diagnosis would allow for more effective intervention.

Source: Could a ‘sniff test’ lead to early autism diagnosis? – Medical News Today