Can you be diagnosed with both autism and ADHD?

Yes. Autism and ADHD commonly co-occur, and many people meet the criteria for both. They are, however, two separate conditions with different diagnostic criteria, so a combined assessment is needed to look at each one in its own right and reach a clear diagnostic picture — sometimes referred to as AuDHD.

AuDHD is an informal term that describes the co-occurrence of autism and ADHD in the same person. It is not a separate clinical diagnosis in its own right. Within a combined assessment, autism and ADHD are each formally assessed and diagnosed against their own diagnostic criteria, and you may receive a diagnosis of one, both, or neither.

Will a private AuDHD diagniosis be recognised by the NHS and other organisations?

The NHS will accept private AuDHD assessments as long as they have been completed robustly and in line with national standards. As long as you use a reputable company, such as ourselves, you can be assured that your assessment, report and diagnostic outcome are evidence-based and will be recognised by other services. To be recognised, an assessment must: Meet NICE guidelines Be completed by appropriately registered clinicians (HCPC, NMC, etc.) Produce a comprehensive diagnostic report You can read more about whether a private assessment will be recognised in our information section here.

Are your combined autism and ADHD assessments for adults NICE-compliant?

The National Institute for Clinical Excellence (NICE) sets out the expected standards for both autism and ADHD assessments in its NICE Guidelines. Our adult AuDHD assessments follow NICE guidelines; therefore, you can be assured that our assessments are NICE compliant. You can find out more about the NICE guidelines here.

What if I’m unsure whether I need an autism or ADHD assessment, or both?

If you are not sure whether your experiences point to autism, ADHD or both, our free pre-screening process is designed to help. You provide us with some background information, and one of our clinicians reviews it and advises which assessment — if any — is the right fit for you. There is no cost or obligation at this stage, and the aim is simply to make sure you are pointed towards the most appropriate assessment. Feel free to contact us to discuss.

How much does a combined autism and ADHD assessment for an adult cost?

You do not need a referral from your GP or another professional to access a combined autism and ADHD assessment with us. You can self-refer by completing our online form, calling or emailing us.

Can I use a private AuDHD diagnosis for workplace adjustments?

Employers have a duty to make reasonable adjustments for employees with a disability. They must ensure that employees are not at a disadvantage because of their disability. Some employers will require proof of the disability, and your private AuDHD diagnosis can be used as evidence for this. You can find out more about workplace adjustments here.

Adult Combined Autism and ADHD Assessment

Private, NICE-COMPLIANT Diagnosis for Adults

If you are an adult who recognises traits of both autism and ADHD, a combined autism and ADHD (AuDHD) assessment can provide clarity, validation, and a fuller understanding of your neurodivergence.

We provide private adult combined autism and ADHD assessments that are NICE-compliant, personalised, and neurodiversity-affirming. Our assessments are designed specifically for adults who may have masked their traits for years or who feel that a single-condition assessment does not fully reflect their lived experience.

Adults aged 18+
No GP referral required
Experienced, registered clinicians
Clear diagnostic outcomes and practical recommendations

Start your free pre-assessment screening here.

Start Your Assessment

What is a combined autism and ADHD (AuDHD) assessment?

AuDHD is an informal term used to describe the co-occurrence of autism and attention-deficit/hyperactivity disorder (ADHD). Although autism and ADHD are distinct conditions with separate diagnostic criteria, they frequently overlap.

Research suggests that 50-70% of autistic individuals also meet criteria for ADHD. When autism and ADHD are assessed in isolation, important aspects of a person’s neurodivergence can be missed. A combined assessment allows both conditions to be explored together, with careful consideration of how traits interact, mask one another, or create internal conflict.

Our adult combined autism and ADHD assessment provides a joined-up, clinically sound exploration of your neurodivergence as a whole.

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Why choose a combined autism and ADHD (AuDHD) assessment?

Many adults are assessed for autism or ADHD separately and later realise that the assessment did not fully explain their experiences. A combined approach reduces the risk of partial or incomplete understanding.

The benefits of an AuDHD assessment include:

One coordinated assessment journey, rather than multiple separate referrals
Improved diagnostic accuracy by understanding how autism and ADHD interact
Lower overall cost compared with completing two separate assessments
A clear, joined-up explanation of your strengths, challenges and needs
Personalised recommendations you can use in work, education and daily life

Signs of AuDHD in adults

Adults with AuDHD often describe a lifelong sense of internal contradiction, overwhelm or burnout, particularly where autistic needs for structure conflict with ADHD-related impulsivity or inattention. Many people experience years of self-doubt, low self-esteem or feeling “too complex” for simple explanations.

Some signs of AuDHD may include:

Wanting to connect with others, but feeling exhausted or overwhelmed by social interaction
Needing structure and planning, but finding it difficult to create or maintain routines
Feeling calmer in an ordered environment, while struggling to organise or declutter
Finding routines comforting, yet difficult to stick to
Difficulty focusing on tasks unless they are intensely interesting
Feeling more regulated when fidgeting or moving
Heightened sensitivity to sound, light, smells or tastes

Everyone’s profile is different, and a diagnostic assessment explores how these traits have been present across your life.

Who is this assessment for?

Many adults mask their neurodivergence and have spent years feeling different, not fitting in and wondering why everyday life is so much harder for them. Our adult combined autism and ADHD (AuDHD) assessment is suitable if you:

Are aged 18 or over
Identify with traits of both autism and ADHD
Struggle with daily activities, work, relationships or burnout
Have previously been told you are “too complex” for a single assessment
Would like a clearer understanding of your neurodivergence
Need others to recognise and respond to your differences

What does a combined autism and ADHD assessment involve?

Our process is designed to be thorough, supportive, and clinically robust. Assessments are completed by experienced clinicians trained in the diagnosis of adult autism and ADHD and follow recognised best-practice standards.Our process adheres to the National Institute for Clinical Excellence (NICE) guidelines for both autism and ADHD, thereby using recognised diagnostic criteria and evidence-based assessment tools.

Onboarding

You will be allocated a dedicated assessment coordinator who will support you throughout your assessment journey. They will gather your details, set you up on our secure system and remain your point of contact at every stage.

Background Information Gathering and Pre-Screening

You will complete screening questionnaires and provide background information about your experiences. These can be completed on a laptop, tablet, or smartphone.

A clinician will carefully review this information and check whether an AuDHD assessment is indicated. If our clinical team feel that the information you have shared with us does not indicate AuDHD, they will discuss this with you. They may feel that an individual autism or ADHD assessment is a better fit, or that no assessment is needed. We do not want you to pay for an assessment you do not need, and we will share our clinical opinion with you.

Assessment Sessions

Your assessment includes three clinical sessions:

A direct observational assessment
An autism diagnostic history interview, completed with you or an informant who knew you in childhood
An ADHD diagnostic interview with you

We use gold-standard diagnostic tools, including:

Autism Diagnostic Observational Assessment – 2nd Edition (ADOS-2)
Autism Diagnostic Interview – Revised (ADI-r)
Autism Clinical Interview for Adults (ACIA)
Diagnostic Interview for ADHD in adults (DIVA-5)

Different clinicians complete each part of the assessment to ensure a balanced and objective outcome.

Multi-Disciplinary Review

All information is reviewed by our multi-disciplinary clinical team, including screening results, assessment observations and history.
This includes:

Information provided by your informant
Results from screening questionnaires
Observations from the assessment sessions
Scores and findings from the assessment sessions

The team will carefully decide whether the diagnostic criteria for autism spectrum disorder and attention deficit hyperactivity disorder are met and what recommendations will be most helpful.

Report and Feedback

You will receive a detailed diagnostic report outlining the assessment process, findings, and outcome. A feedback session is then offered to discuss the report, answer questions, and explore your next steps.

What are the benefits of receiving an AuDHD assessment?

Many adults describe receiving a diagnosis as life-changing. It is the first step toward better self-understanding and self-acceptance. Understanding your neurodivergence can help you view and understand your life experiences through a different lens.

A diagnosis can also help:

Others recognise your strengths, challenges, and needs.
Support requests at work, including reasonable adjustments
Access further support or treatment, if you wish to explore this

Your report can be used as evidence in workplace adjustments that employers have a legal duty to consider.

Start Your Assessment

Why choose a private adult autism and ADHD assessment?

Many adults choose a private assessment due to long NHS waiting times and the need for timely answers.

Benefits of choosing a private provider include:

Being seen in weeks rather than years
Online or hybrid online/ in-person session options
No need for a GP referral
A dedicated assessment coordinator throughout
A comprehensive diagnostic report

Our friendly, professional team will support you throughout your assessment journey. Our clinicians are highly experienced, qualified, and registered with the appropriate professional bodies.

Start Your Assessment

Ready to take the next step?

If you think a combined autism and ADHD assessment may be right for you, we’re here to help.

Enquire about an adult combined autism and ADHD assessment here.

Start Today

Frequently Asked Questions

Can you be diagnosed with both autism and ADHD?
Yes. Autism and ADHD commonly co-occur, and many people meet the criteria for both. They are, however, two separate conditions with different diagnostic criteria, so a combined assessment is needed to look at each one in its own right and reach a clear diagnostic picture — sometimes referred to as AuDHD.
What is AuDHD?
AuDHD is an informal term that describes the co-occurrence of autism and ADHD in the same person. It is not a separate clinical diagnosis in its own right. Within a combined assessment, autism and ADHD are each formally assessed and diagnosed against their own diagnostic criteria, and you may receive a diagnosis of one, both, or neither.
Will a private AuDHD diagniosis be recognised by the NHS and other organisations?
The NHS will accept private AuDHD assessments as long as they have been completed robustly and in line with national standards. As long as you use a reputable company, such as ourselves, you can be assured that your assessment, report and diagnostic outcome are evidence-based and will be recognised by other services.
To be recognised, an assessment must:
- Meet NICE guidelines
- Be completed by appropriately registered clinicians (HCPC, NMC, etc.)
- Produce a comprehensive diagnostic report
You can read more about whether a private assessment will be recognised in our information section here.
Are your combined autism and ADHD assessments for adults NICE-compliant?
The National Institute for Clinical Excellence (NICE) sets out the expected standards for both autism and ADHD assessments in its NICE Guidelines. Our adult AuDHD assessments follow NICE guidelines; therefore, you can be assured that our assessments are NICE compliant. You can find out more about the NICE guidelines here.
What if I’m unsure whether I need an autism or ADHD assessment, or both?
If you are not sure whether your experiences point to autism, ADHD or both, our free pre-screening process is designed to help. You provide us with some background information, and one of our clinicians reviews it and advises which assessment — if any — is the right fit for you. There is no cost or obligation at this stage, and the aim is simply to make sure you are pointed towards the most appropriate assessment. Feel free to contact us to discuss.
How much does a combined autism and ADHD assessment for an adult cost?
You do not need a referral from your GP or another professional to access a combined autism and ADHD assessment with us. You can self-refer by completing our online form, calling or emailing us.
Can I use a private AuDHD diagnosis for workplace adjustments?
Employers have a duty to make reasonable adjustments for employees with a disability. They must ensure that employees are not at a disadvantage because of their disability. Some employers will require proof of the disability, and your private AuDHD diagnosis can be used as evidence for this. You can find out more about workplace adjustments here.

Adult Combined Autism and ADHD Assessment

Private, NICE-COMPLIANT Diagnosis for Adults

What is a combined autism and ADHD (AuDHD) assessment?

Why choose a combined autism and ADHD (AuDHD) assessment?

Signs of AuDHD in adults

Who is this assessment for?

What does a combined autism and ADHD assessment involve?

Onboarding

Background Information Gathering and Pre-Screening

Assessment Sessions

Multi-Disciplinary Review

Report and Feedback

What are the benefits of receiving an AuDHD assessment?

Why choose a private adult autism and ADHD assessment?

Ready to take the next step?

Frequently Asked Questions

Can you be diagnosed with both autism and ADHD?

What is AuDHD?

Will a private AuDHD diagniosis be recognised by the NHS and other organisations?

Are your combined autism and ADHD assessments for adults NICE-compliant?

What if I’m unsure whether I need an autism or ADHD assessment, or both?

How much does a combined autism and ADHD assessment for an adult cost?

Can I use a private AuDHD diagnosis for workplace adjustments?