Autism spectrum presentation and assessment

Early social-communication features can include reduced reciprocal smile, limited showing or pointing, reduced response to name, less shared attention, unusual prosody or delayed communicative language. Some children speak on time but use language in scripted, literal or one-sided ways. Others use few words or augmentative communication. Eye contact varies with culture, anxiety and sensory load and is never a stand-alone test.

Restricted or repetitive features include repetitive movement or speech, intense or unusual interests, distress with change, ritualised routines, repetitive play and hyper- or hyporeactivity to sound, light, texture, pain, smell or internal sensations. The feature becomes diagnostically meaningful as part of a persistent pattern with developmental and functional context, not because every child with a preferred routine is autistic.

School-age presentation can be subtle. A child may have advanced vocabulary but struggle with reciprocal friendship, implied meaning, group rules, transitions, organisation or sensory environments. Distress can appear at home after sustained masking at school. In adolescence, rising social complexity may reveal exhaustion, shutdown, anxiety, depression, eating difficulty or school refusal that obscures the underlying neurodevelopmental profile.

Girls and gender-diverse young people may be under-recognised because interests appear socially typical, observation is internalised, imitation is strong or behaviour is less externally disruptive. Ask about the effort and recovery cost of social performance, scripted interaction, intense friendships, sensory coping and private repetitive behaviours. Do not require a stereotyped male presentation.

Referral starts with concern, not a screening cut-off. NICE advises taking parent and child concerns seriously, gathering observations and considering duration, severity, settings, developmental context and factors associated with autism. Likelihood tools can structure information, but positive results have other causes and negative results do not exclude autism. Include antenatal, perinatal, family, developmental, medical and educational information in the referral.

The autism team is multidisciplinary, with paediatric or psychiatric, speech and language and psychological expertise and access to occupational, neurological and educational input. The assessment includes concerns and strengths, home and education context, autism-focused developmental history, direct observation, medical history and examination, differential diagnosis, coexisting conditions and a functional needs profile. A named coordinator should reduce repeated history-taking.

No laboratory, scan, genetic test, questionnaire or observation schedule is a gold-standard diagnostic test. Structured tools such as ADOS-2 or ADI-R may support trained assessment but cannot replace clinical integration or independently exclude autism. Seek collateral information and, where uncertainty remains, observe in another setting, gather further reports, review over time or seek a second opinion.

Differential diagnosis is not a contest for one label. Developmental language disorder, intellectual disability, ADHD, hearing or visual impairment, anxiety, attachment disruption, trauma, selective mutism, OCD and motor coordination disorder can resemble parts of the profile and can coexist. Social-communication ability must be interpreted relative to overall developmental level and language access.

Medical assessment searches for coexisting needs rather than a physical ‘cause’ in every child. Measure growth and head circumference where relevant and assess dysmorphism, skin, neurology, hearing and vision. NICE recommends no routine medical investigation solely because autism is diagnosed. Consider genomic testing under current regional and national pathways when intellectual disability, dysmorphism or congenital anomalies are present, and EEG only when epilepsy is suspected.

Support begins before diagnosis. Provide predictable appointments, sensory adjustments, visual information, communication aids, transition preparation and school reasonable adjustments. A diagnosis may improve self-understanding and access but should not be required for every needs-led intervention. Explain autism using the child's preferred language and involve them in decisions at their developmental level.

NICE recommends a specific social-communication intervention for core features that uses play-based strategies with parents, carers and teachers to increase joint attention, engagement and reciprocal communication; delivery is adapted by age and may include peer mediation. The goal is meaningful communication and participation, not forced eye contact, suppression of harmless self-regulation or making the child appear non-autistic.

Behaviour that challenges is communication until proved otherwise. Assess pain, constipation, reflux, dental disease, epilepsy, sleep, anxiety, ADHD, communication frustration, sensory environment, unpredictability, demands, abuse and inadvertent reinforcement. Create a functional formulation and alter triggers and skills. Antipsychotic medication is considered only by specialists for severe behaviour when psychosocial intervention is insufficient or cannot be delivered, with explicit targets and early stop review.

Treat coexisting ADHD, anxiety, depression, sleep, epilepsy, feeding and gastrointestinal problems through their evidence-based pathways, with communication and sensory adjustments. Avoid chelation, secretin, hyperbaric oxygen, auditory integration, neurofeedback for speech, omega-3 for sleep and gluten- or casein-free diets for core autism features. Restricted diets need nutritional review rather than unsupported exclusion.

Follow-up monitors participation, communication, physical and mental health, family capacity, education and transitions. Puberty, changing school and reduced structure can alter support needs. Discuss sexuality, online safety, exploitation and independent living explicitly. Plan transfer to adult services early and record which service owns ADHD medicines, epilepsy care, mental health and annual health review where eligible.