Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Acute change in an autistic child
Autism does not explain sudden loss of consciousness, motor function, speech after age 3, catatonic change, severe self-injury or inability to eat and drink.
Action: Use ABCDE and assess pain, infection, constipation, injury, medication, intoxication, seizure and mental-health risk. New motor regression at any age or language regression after age 3 requires paediatric or neurological assessment. Severe agitation needs a low-stimulation environment, familiar communication and the least restrictive safe intervention. Escalate safeguarding, crisis mental health or paediatric care according to immediate risk rather than attributing change to ‘behaviour’.
Synopsis
Recognise diverse and masked autistic presentations, refer on clinical concern without misusing screening scores, complete multidisciplinary diagnostic and coexisting-needs assessment, and provide strengths-based support before and after diagnosis.
Autism is a lifelong neurodevelopmental difference characterised by persistent social-communication differences plus restricted or repetitive patterns, interests or sensory responses with functional impact.
Presentation varies by age, language, intellectual ability, sex, culture and environment; masking can delay recognition, especially in girls and adolescents.
Take child, parent and professional concerns seriously even when different settings report different behaviour.
Key red flags
Language or social regression under age 3 requires autism-team referral; language regression after 3 and motor regression at any age first requires paediatric or neurological assessment.
Investigation priorities
01
Reference standard: multidisciplinary autism diagnostic assessmentFirst stepReference standard
Integrate development, direct observation, diagnostic features, function, differentials and coexisting needs.
02
First-line: developmental history and multi-setting collateralFirst line
Establish early features, persistence, masking, strengths and impact across home, education and community.
Management branches
RecognitionBuild a pattern, not a stereotype
Development, behaviour, communication or wellbeing raises possible autism.
Hear child and caregiver concerns and gather examples of reciprocity, communication, flexibility, interests and sensory response.
Review development, function and masking across settings and assess hearing, language, cognition and coexisting conditions.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.