Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help if the person is in immediate danger, has suicidal thoughts with intent or a plan, is severely injuring themselves or another person, or has a seizure lasting longer than five minutes.
Emergency care is also appropriate for repeated seizures without recovery, serious injury, or breathing difficulty.
Arrange a prompt medical evaluation for loss of previously acquired skills, a major unexplained behavior change, possible seizures, persistent feeding problems, significant weight change, or worsening anxiety or depression.
Routine follow-up should review communication, learning or work, sleep, nutrition, emotional health, safety, medications, and access to needed services.
Children may need reassessment during major transitions, such as starting school or moving into adult care.
Adults may benefit from follow-up when support needs, relationships, work, housing, or mental health change.
Every sign above is quoted from the sofidex article on Autism spectrum disorder. If you are not sure, err upward — it is always reasonable to be checked.