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Private Adult Autism Assessment and Diagnosis

Private Adult Autism Assessment and Diagnosis

Gold-standard adult autism assessments designed to provide insight, reassurance and ongoing support.

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Private Autism Services for Adults

Private Autism Services for Adults

Adult autism assessments are available for individuals aged 18 and over, combining neurodevelopmental expertise with a supportive, person-centred approach to help you gain clarity and confidence.

Start your assessment within 24 hours of booking
Dedicated Patient Support Coordinator – a single point of contact throughout your journey
Online or in-person appointments available
Adheres to NHS and NICE guidelines with gold-standard assessment methods
Personalised recommendations for next steps and ongoing support
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Expert Adult Autism Assessments You Can Trust

Our adult autism assessments are available online across the UK or in person at our Kent and Cheltenham clinics, adhering to NHS and NICE guidelines. Our experts receive ongoing training to understand how autism presents across different genders, ages, and cultural backgrounds. Combining specialist knowledge, evidence-based tools, and a person-centred approach, we deliver clear, comprehensive assessments that reflect each individual’s unique profile.

Common Signs of Autism in Adults

Autism presents differently in everyone. Many autistic adults share traits, but these experiences vary widely and can be shaped by a wide range of factors. Recognising these patterns can help people better understand themselves and access the right support.

Unique communication style or preference for direct, honest conversation
Strong need for routine or predictability
May have a passion for special interests
Heightened sensitivity to sensory input such as sounds, lights, textures or smells
Feeling socially drained or misunderstood in certain settings
Tendency to take things literally, preferring clear, direct language
Feeling “different” or misunderstood throughout life
May have repetitive behaviours or physical movements
Using strategies (often called masking) to manage social expectations
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What Happens in an Adult Autism Assessment?

1

Before Your Diagnostic Interview

To ensure we’re the right service for you, we’ll begin with a brief triage process. You will also complete a set of questionnaires, alongside someone who knows you well (often referred to as an informant), helping us build a comprehensive understanding of your experiences.
2

Your Diagnostic Interview

Your assessment takes place via secure video consultation with an experienced clinician and lasts up to 90 minutes. Sometimes we will ask your informant to attend with you. We’ll explore your developmental and family history, alongside key areas such as social communication, sensory processing, and behavioural patterns, to provide a thorough and evidence-based evaluation.
3

Your Outcome & Report

Following your assessment, our multidisciplinary team carefully reviews the findings against recognised diagnostic criteria. You will be invited to attend a feedback appointment to discuss the outcome, ask questions, and explore tailored support options such as talking therapy. Your detailed clinical report will be provided within 10 working days and, with your consent, shared with your GP.

Support for Autism in Adults

RTN Mental Health offers follow-up recommendations post-diagnosis and ongoing support for autistic adults, including talking therapies. Our therapists help clients manage anxiety, develop coping skills, and build confidence for everyday life.

CBT for autism
Support for Autism in Adults
Why Choose RTN Mental Health for Your Private Assessment?

Why Choose RTN Mental Health for Your Private Assessment?

Fast Assessments

Complete Adult Autism diagnosis with assessments starting within 24 hours, online or in person.

Nationwide Coverage

Access clinicians anywhere in the UK.

NHS-Standard Assessments

Meets NHS and NICE diagnostic standards.

Ongoing Personalised Care

Ongoing support with therapy and coaching.

What Our Patients Say

See what our patients have to say about their experience with RTN Mental Health. We’re proud to provide trusted, compassionate, and effective care that makes a real difference.

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We’re here to help

If you’re ready to talk and share your experiences, we’re ready to listen. Schedule your assessment with one of our expert assessors today.

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Adult Autism Assessment FAQs

Who can have an adult autism assessment with RTN?
Our adult autism assessments are designed for individuals aged 18 and over who may experience social, communication, or sensory differences, or who suspect they may be autistic. You can self-refer for a private assessment.
Are assessments available online?
Yes. Assessments are delivered online for accessibility and convenience. Private assessments can take place online or in person at our Kent and Cheltenham clinics.
What happens during an autism assessment?
Assessments are led by experienced Neurodevelopmental Assessors using gold-standard diagnostic tools such as the ADOS-2 and ADI-R, alongside a detailed clinical interview. The process is collaborative, person-centred, and designed to help you feel comfortable, understood, and supported at every stage.
Do you understand how autism presents differently across genders?
Yes. Our Neurodevelopmental Assessors receive ongoing training to recognise how autism can present differently across genders, ages, and cultural backgrounds. Many traditional diagnostic tools were developed around male traits, meaning autism in women and girls can sometimes be missed or misunderstood. RTN’s clinicians are trained to look beyond standard checklists to ensure every assessment reflects the individual’s unique presentation.
How soon can I start my assessment?
Once you book a private assessment, your process can begin within 24 hours. We don’t commit to fixed completion timeframes, as progress depends on completing pre-assessment forms and appointments.
What does “adheres to NICE guidelines” mean?
It means our experts follow the standards set out by the National Institute for Health and Care Excellence (NICE) for autism diagnosis in adults. This ensures your assessment meets the same quality and clinical standards used in NHS services.
What support is available after diagnosis?
You’ll receive a detailed report with clear recommendations for next steps, including therapy, workplace support, or community resources. You can also access ongoing help through RTN Therapies, which provides tailored talking therapies and emotional regulation support for autistic adults.
Can I pay for my assessment in installments?
Yes. Flexible payment options are available, allowing you to spread the cost of your assessment.
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Have A Question?

If you have a question about our Adult Autism Assessments please complete the form and we’ll get back to you.

Enquiries:
0333 772 1164
enquiries@rtnmentalhealthsolutions.com
For feedback, complaints and SAR requests:
feedback@rtnmentalhealthsolutions.com
71-75 Shelton St, London WC2H 9JQ
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