AuDHD Assessment UK: Can You Be Assessed for Autism and ADHD Together?

When one diagnosis does not explain the whole picture

You finally get an ADHD diagnosis. Some things make sense straight away: the unfinished projects, the time blindness, the struggle to start a task until it becomes urgent.

But other things still do not fit. Why do changes of plan feel so destabilising? Why can a noisy room leave you unable to think? Why do you crave routine but repeatedly fail to maintain one? Or perhaps you were diagnosed as autistic first and still cannot explain the impulsivity, shifting interests and constant battle with time.

This is often where people start searching for an AuDHD assessment in the UK.

The short answer: You can be diagnosed with both autism and ADHD. Some services can assess both together, but many UK pathways still use separate referrals, teams and waiting lists. AuDHD itself is not a separate clinical diagnosis. You normally receive one diagnostic decision for autism and another for ADHD.

I regularly meet people who feel that one diagnosis has explained half of their life. Wanting the other half explored is not collecting labels. It is asking for an assessment that accounts for your full experience.

While you are working out the assessment route: AuDHD-informed mentoring cannot diagnose you, but it can help you identify conflicting needs, reduce day-to-day friction and test practical strategies that respect both sides of your neurodivergence. Learn about AuDHD mentoring.

What does AuDHD mean clinically?

AuDHD is a term used by the neurodivergent community for someone who is both autistic and has ADHD. It describes a real combination of two recognised neurodevelopmental conditions, but "AuDHD" is not the name of a separate diagnosis.

If an assessment finds that you meet the criteria for both, your records will normally list:

• Attention deficit hyperactivity disorder
• Autism spectrum condition or autism spectrum disorder, depending on the terminology used by the service

This matters when you contact a provider. Asking for an "AuDHD assessment" may help explain what you want, but you should also ask whether the service completes full diagnostic assessments for both autism and ADHD.

I have a separate guide to what AuDHD feels like. This article is about the assessment process rather than repeating the traits.

Can autism and ADHD be assessed together?

Yes, but availability depends on the service.

Some NHS neurodevelopmental services assess autism and ADHD within the same wider team. Nottinghamshire Healthcare's Neurodevelopmental Specialist Service, for example, publishes assessment information for both conditions and explains that each assessment considers developmental history, questionnaires and information from more than one source where possible. Its autism and ADHD pathways still use different diagnostic methods.

Other areas have one autism team and one ADHD team under the same service. Elsewhere, the pathways are completely separate. You may need two GP referrals and spend time on two waiting lists.

Private providers may advertise a combined assessment. Before booking, ask what "combined" means. It could mean coordinated appointments with one integrated report, or it could mean buying two assessments from the same company.

The NHS Nottinghamshire assessment guide is a useful example of what a detailed service explanation looks like. It describes separate autism and ADHD procedures while keeping both within one neurodevelopmental service.

Why the assessments are not identical

Autism and ADHD overlap, but clinicians are not asking exactly the same questions.

An ADHD assessment looks for persistent patterns of inattention and/or hyperactivity and impulsivity. It should explore whether those patterns began in childhood, appear in more than one setting and cause meaningful impairment.

An autism assessment looks at lifelong differences in social communication and interaction, alongside restricted or repetitive patterns, focused interests, routines and sensory experiences. The NHS guidance on autism in adults also notes that ADHD can make autistic signs harder to recognise.

A full assessment may include:

• Referral forms and screening questionnaires
• A detailed clinical interview
• Developmental and childhood history
• Examples from work, education, relationships and daily life
• Information from someone who knows you well, where available
• School reports or other historical records
• Consideration of physical health, mental health and other neurodevelopmental conditions
• A feedback appointment and written report

For ADHD, some services use structured interviews such as DIVA or ACE+. Autism services may use observational or developmental tools as part of a broader clinical assessment. No questionnaire or computer test should make the diagnosis by itself.

Will one assessment automatically find the other condition?

It might identify signs, but it will not always produce a second diagnosis.

A responsible ADHD assessment should consider whether anxiety, trauma, autism, sleep problems or another condition could better explain some of your difficulties. In the same way, an autism assessment should consider ADHD and other possible explanations.

That does not mean the assessor can diagnose everything they notice. They may not have the right professional expertise, enough assessment evidence or a service contract that allows them to complete the second assessment.

You may hear:

• "We noticed autistic traits and recommend an autism referral."
• "Your attention difficulties need a separate ADHD assessment."
• "We need more developmental information before reaching a decision."
• "One condition appears to explain the difficulties more fully."

If a clinician recommends another referral, ask them to include that recommendation in your report. Written clinical reasoning can be helpful when you return to your GP.

Which assessment should come first?

There is no single correct order.

Some people begin with the condition that is affecting them most. Someone struggling with impulsivity, missed deadlines and unsafe driving may prioritise ADHD assessment. Someone experiencing severe sensory overload, communication differences and distress around change may begin with autism.

Practical factors matter too:

• Which local service accepts your referral
• Whether you already have one diagnosis
• Waiting times in your area
• Whether a provider can assess both
• Whether you are considering ADHD medication
• What evidence you currently have

If you already have one diagnosis, take the full report to the second assessment. Do not assume the new assessor has access to it.

An existing diagnosis should not be used to explain away every difficulty. It should become part of the evidence. The assessor can then ask whether the second condition adds a better explanation for experiences that remain unaccounted for.

NHS, Right to Choose and private routes

Local NHS services

Start by asking your GP what adult autism and ADHD pathways operate in your area. Referral rules vary. Some services accept self-referrals, while others require a GP or mental health professional.

Ask specific questions:

1. Are autism and ADHD handled by the same service?
2. Do I need separate referrals?
3. Can the service assess coexisting autism and ADHD?
4. What screening forms or supporting evidence are required?
5. What support is available while I wait?

The NHS website advises adults who think they may be autistic to speak to a GP, who may refer them for assessment and explain local support.

Right to Choose

Right to Choose applies to eligible patients in England, not across the whole UK. Provider contracts and services change, so check what a provider is currently commissioned to assess before requesting a referral.

Do not assume that an ADHD Right to Choose provider also offers an NHS-funded autism assessment. You may need a different provider or referral. Confirm this with the provider and your GP rather than relying on an old list or social media post.

Private assessment

Private assessment may reduce the wait, but it is worth slowing down before paying.

Check:

• The clinician's professional registration and relevant experience
• Whether the process follows NICE guidance
• Whether both conditions are assessed in full
• What the quoted fee includes
• Whether you receive a detailed report
• How diagnostic uncertainty is handled
• Whether ADHD medication assessment and titration cost extra
• What post-diagnostic support is offered

If medication matters to you, discuss future prescribing with your GP before booking a private ADHD assessment. A private diagnosis does not automatically require your GP to accept shared care.

How to prepare without turning it into a second job

Preparing for two possible assessments can become a research project that swallows your life. You do not need a colour-coded dossier covering every unusual thing you have ever done.

Start with a simple timeline:

For each example, write what happened, how often it happened and what effect it had. "I struggle socially" is hard to assess. "I rehearse phone calls, miss hints that someone wants to end a conversation and need the evening alone after an office day" gives the clinician something concrete.

Bring school reports if you have them. If you do not, say so. Not everyone has contact with family, safe childhood informants or surviving records. Ask the provider what alternative evidence it accepts.

It also helps to note which strategies you already use. Arriving on time does not prove that time management is easy if you set six alarms, leave an hour early and spend the morning unable to do anything else.

What if the outcome is only one diagnosis?

You might receive both diagnoses, one diagnosis or neither. You might also receive a request for more information.

If the outcome surprises you, ask:

• Which criteria were and were not met?
• How did the team separate overlapping traits?
• What alternative explanations did it consider?
• Did masking or compensating strategies affect the assessment?
• Does the report recommend another assessment?
• What support is available based on my needs, regardless of diagnosis?

A diagnosis can be useful, but your practical needs do not disappear when a threshold is not met. Sensory adjustments, external planning systems, clearer communication and recovery time may still help.

Support while you wait

Assessment waiting lists can leave you feeling suspended between "I think this explains me" and "I am allowed to ask for help." You do not have to postpone every practical change until a clinician confirms a diagnosis.

You can:

• Track sensory, attention and energy patterns
• Experiment with flexible routines
• Request adjustments based on the difficulties you experience
• Use written instructions and external reminders
• Learn about AuDHD burnout
• Explore AuDHD-informed mentoring

Mentoring is not assessment, therapy or medical treatment. What it can offer is a place to work out why standard ADHD advice sometimes clashes with an autistic need for predictability, or why a perfect routine collapses when novelty disappears.

That is the work I do with AuDHD adults and students. We build support around the brain you are living with now, not the paperwork you may receive in two years.

You can read more about my mentoring services and session prices before deciding whether it feels right for you.

If you suspect you are both autistic and have ADHD, or one diagnosis has left you with more questions, book a free discovery call. We can talk about the practical challenges you want help with and whether my AuDHD mentoring approach fits what you need.