How Is Dementia Diagnosed in the UK?

Forgetting the occasional name or misplacing your keys is a normal part of life, particularly as we get older. However, when everyday forgetfulness gives way to noticeable disorientation, missed appointments, or difficulty managing familiar routines, it is natural for concerns about dementia to surface.

While jumping to conclusions is easy during moments of worry, memory loss and behavioral changes are not exclusive to dementia. A wide spectrum of medical conditions, ranging from vitamin deficiencies, thyroid imbalances, and urinary tract infections (UTIs) to stress, poor sleep, and medication side effects, can produce similar symptoms. Even normal ageing leads to a general decline in physical and cognitive abilities.

As so many distinct health issues share overlapping warning signs, attempting to self-diagnose often leads to unnecessary anxiety or missed treatment opportunities. Seeking a thorough, professional evaluation from a doctor is the crucial first step toward gaining clarity, ruling out reversible causes, and securing the right care.

What Is Dementia?

Dementia is an umbrella term for a group of conditions related to the decline of brain health. For many people, this will show through memory loss, difficulty communicating or keeping up with conversations, thinking speed, and reduced mobility.

Although all types of dementia affect the brain, they don’t all cause the same symptoms. The four most common types include:

  • Alzheimer’s Disease makes up 60-80% of all dementia cases. It often begins with short-term memory loss before gradually affecting thinking, language, orientation, and everyday functioning.
  • Vascular Dementia develops when reduced blood flow damages the brain. It can occur after a stroke or as a result of several smaller strokes or other blood vessel conditions. 
  • Lewy Body Dementia commonly causes movement difficulties, fluctuating attention and visual hallucinations, alongside memory and thinking problems. 
  • Frontotemporal Dementia mainly affects personality, behaviour and language. Memory is often less affected during the early stages, although it may decline as the condition progresses. 

When Should You See a GP?

While dementia symptoms are gradual and progressive, you should seek medical advice from a GP if you notice:

  • Increasing memory loss.
  • Confusion.
  • Difficulty managing finances.
  • Getting lost in familiar places.
  • Personality changes.
  • Communication difficulties.
  • Struggling with everyday tasks.

It is important to seek advice as early as possible if these symptoms persist or begin affecting everyday life. Even if it is not dementia, you will be able to catch potential health conditions, vitamin deficiencies, and medication side effects that could be causing this.

An early diagnosis gives people access to treatment, support and advice sooner. Although dementia cannot currently be cured, some medications may temporarily manage symptoms for certain people. An early diagnosis also gives individuals and families time to plan for the future, including arranging a Lasting Power of Attorney and discussing future care preferences.  

The Initial GP Appointment 

During this first GP appointment, you will discuss symptoms, how long they have been occurring, and your medical history. They may review the medications that you are currently taking to eliminate the chance of side effects.

The GP may also contact a family member for observations. This will only be done with consent. They may also carry out some simple memory and thinking tests to assess areas such as memory, concentration, language and problem-solving. 

In many cases, a GP cannot diagnose dementia during the first appointment. Instead, they’ll use the information they’ve gathered to decide whether further tests or a referral to a specialist memory clinic are needed. 

What Tests May Be Conducted?

Photo of a nurse holding a binder and pen, talking to an elderly couple, who appear out of focus in the foreground

Following the GP appointment, several tests may be carried out to assess whether you are suffering from dementia.

Memory and cognitive tests

Tests of memory and cognitive function are an effective way to identify changes in thinking and memory. These tests don’t diagnose dementia on their own. Instead, they help healthcare professionals build an overall picture of a person’s cognitive abilities. These tests will usually involve simple questions that are designed to assess your:

  • Memory.
  • Attention.
  • Language.
  • Problem-solving.
  • Orientation.

There are a range of tests that may be conducted, including:

Blood tests

Blood tests are usually conducted to eliminate other potential causes of your symptoms. Some dementia symptoms can be very similar to those of:

Brain scans

Once the preliminary tests have been completed, you may also have brain scans, through an MRI scan and a CT scan. A CT scan is effective in identifying structural changes to the brain, tumours, or strokes. An MRI scan provides more detailed images of the brain and may show changes that are commonly associated with particular types of dementia.

Brain scans also help doctors rule out other possible causes of symptoms, such as tumours or evidence of previous strokes, although not everyone will require one.

Referral to a Memory Clinic

Many people are referred to a specialist memory clinic following these preliminary tests. This could include assessment by a range of healthcare professionals, depending on your symptoms and previous tests, including:

  • Multidisciplinary teams.
  • Specialist nurses.
  • Psychiatrists.
  • Neurologists.
  • Geriatricians.
  • Psychologists.

These assessments will usually be longer interviews alongside detailed cognitive testing. With the person’s permission, family members or carers are often invited to share their observations, as they may have noticed changes that the individual is unaware of. 

What Happens After a Diagnosis?

If you receive a dementia diagnosis, it does not mean that you suddenly lose all capabilities. Many people will continue to live independently and healthily for years following their diagnosis.

However, this is a good opportunity to consider some future planning, such as finances and care, while you are still able to express your preferences. Doing so now will ensure that the decisions made align with their wishes.

There is a range of community support, support groups, therapy, and dementia advisors that are there to guide someone with dementia and their families through this diagnosis. 

Although receiving a dementia diagnosis can feel overwhelming, it also provides answers and opens the door to treatment, specialist support and future planning. Seeking medical advice early allows people to access the right help sooner and gives families the time they need to make informed decisions together.