How is dementia diagnosed? What families can expect and how to feel prepared

Something has shifted with a person you love, a change that's hard to put into words but is proving to be difficult to ignore. Maybe you've noticed your mother repeating herself more than usual, or your father has gotten lost driving a route he's taken for years.

The question of whether it could be Demencia has crossed your mind, and that’s a lot to carry. Most families don't arrive at a dementia evaluation all at once. They get there after months of small moments, of wondering whether to say something, of waiting to see if things improve.

Wherever you are in the journey, understanding how dementia is diagnosed can take some of the uncertainty and fear out of the process and help you and your loved one move forward with a better idea of what things may look like for the road ahead.

Understanding the scope of dementia

According to Alzheimer's Disease International, someone develops dementia somewhere in the world every three seconds. In 2020, over 55 million people worldwide were living with dementia, and the number is expected to almost double every 20 years, reaching 78 million by 2030. In the United States, more than 42% of people over the age of 55 will develop dementia in their later years.

While these numbers are significant, they don't capture the very real, human experience of the families who are sitting in waiting rooms, searching for answers and wondering what comes next for their loved one.

Research shows that families wait an average of 3.5 years after noticing the first signs of cognitive change before seeking a medical evaluation. That delay is understandable. Watching someone you love change or struggle is emotional. But earlier conversations with a trusted provider open the door to earlier support, better planning and more time.

What are the early signs of dementia?

Dementia is not a single condition. It's an umbrella term that describes a group of symptoms affecting memory, thinking, behavior and the ability to perform daily tasks.

These symptoms result from changes in the brain, and they can stem from several different underlying causes. Many forms of dementia are progressive, meaning symptoms tend to worsen gradually over time.

Early dementia signs can vary widely depending on the type and the person, but some of the most common changes include:

• Forgetting recent conversations, appointments or names of familiar people
• Getting confused about the date, time or where they are
• Struggling to follow a conversation or find the right words
• Difficulty with tasks that once came easily, like managing finances or following a recipe
• Changes in mood, personality or social withdrawal
• Trouble with judgment or making decisions

If several of these sound familiar, it doesn't mean your loved one has a definitive diagnosis of dementia. It means there's a conversation worth having with a doctor.

Alzheimer's vs. dementia: Understanding the difference

One of the most common sources of confusion for families about how dementia is diagnosed is the relationship between Enfermedad de Alzheimer and dementia. They are not the same.

Demencia is the broader term, describing a decline in cognitive function severe enough to interfere with daily life. These symptoms can be caused by a variety of underlying conditions.

Enfermedad de Alzheimer, the most common cause of dementia that accounts for 60 to 80% of cases, is a progressive brain condition that gradually damages memory and thinking skills over time.

To put it simply, dementia describes what is happening, while Alzheimer’s explains why it is happening.

Related article: Is dementia hereditary? Understanding your family’s risk

The first step: A conversation with a primary care provider

The process towards a diagnosis of dementia typically begins with a visit to your loved one's primary care provider. This can be the most emotional step, because it makes the concern and potential reality feel more real.

Before the appointment, it helps to keep a log of the changes you've noticed. Write down specific examples, such as "she asked me the same question four times in one afternoon" or "he left the stove on twice this week." Concrete observations can be more useful than general descriptions, and they will help the doctor understand the pattern and timeline of what you have been seeing.

During the visit, the doctor will take a detailed medical history and ask about current medications, since some can affect memory and cognition. They'll also check for other potential explanations for the noticed symptoms, which can mimic those of dementia or worsen cognitive decline, including:

• Thyroid problems
• Vitamin deficiencies
• Infecciones del tracto urinario (ITU)
• Depresión
• Trastornos del sueño

How is dementia diagnosed? It starts with a cognitive screening

One of the earliest tools in the diagnostic process for dementia is cognitive screening. These are brief, structured assessments that a provider can administer right in the office. These tools help paint a picture of where someone is functioning cognitively at a given point in time.

Two of the most widely used screening tools for dementia are the Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA). Both involve a series of tasks that assess things like short-term memory recall, attention, language and the ability to follow instructions or copy a drawing.

The doctor may also use a simpler tool called the Mini-Cog, which combines a memory test with a clock-drawing exercise.

A screening result that suggests cognitive impairment doesn't necessarily confirm dementia on its own. It tells your doctor that a deeper evaluation may be warranted.

Referral to a specialist

If your loved one’s doctor wants a more thorough evaluation, they will refer them to a specialist. Depending on the situation, that might be a:

• Neurologist
• Geriatrician
• Geriatric psychiatrist
• Neuropsychologist

They will conduct a thorough neurological exam, looking at reflexes, balance, coordination and other indicators of how the brain and nervous system are working together. They will also dive deeper into personal and family medical history and spend more time talking with both your loved one and you, or anyone else who is accompanying them.

If you are the family member attending this appointment, your observations matter. You may have noticed things that your loved one doesn't. Specialists often rely on input from family members to understand how someone is functioning at home, not just in a clinical setting.

Neuropsychological tests for early signs of dementia

For a more detailed picture of how someone’s brain is functioning, the doctor may recommend a full neuropsychological evaluation. The evaluation can take several hours and covers a wide range of cognitive functions, including:

• Memory, both immediate and delayed recall
• Language and verbal fluency
• Processing speed
• Attention and concentration
• Visual-spatial abilities
• Executive function, which includes skills like planning, problem solving and mental flexibility

The results of neuropsychological testing can show two important things:

1. Determines whether cognitive impairment is present and how it compares to what would be expected for someone of that age and education level
2. Identifies the specific pattern of impairment, which can point toward a particular type of dementia or rule out other conditions

Brain imaging and lab work

While cognitive testing tells doctors how the brain is performing, brain imaging helps them see what's happening inside the brain itself. Two of the most commonly used imaging tools in the dementia evaluation process are magnetic resonance imaging (MRI) and computed tomography (CT) scans.

An MRI provides detailed images of brain structure and can reveal things like volume loss in specific regions, changes in white matter or evidence of past strokes.

A CT scan can also identify structural changes and is sometimes used when an MRI isn't an option. These scans don't diagnose dementia on their own, but they provide important context that helps complete the clinical picture.

In some cases, a doctor may order more advanced imaging, such as a positron emission tomography (PET) scan, which can detect the presence of protein fragments that accumulate between nerve cells in the brain or changes in the brain’s metabolism that are typically associated with Alzheimer's.

Lab work is also a routine part of the evaluation. Blood tests check thyroid function, vitamin B12 levels, kidney and liver health, and markers of other conditions that can affect cognition. In some cases, a cerebrospinal fluid (CSF) analysis, or spinal tap, may be recommended to look for specific proteins associated with Alzheimer's.

How long does the diagnosis process for dementia take?

The timeline for getting a dementia diagnosis varies depending on the complexity of the case, the specialists involved and the pace of scheduling. For some people, the process moves relatively quickly, a few weeks from the initial primary care visit to a referral and evaluation. For others, especially when multiple tests are needed or when symptoms are less clear-cut, the process can take several months.

Waiting can be the most challenging part, but a thorough evaluation, even when it takes time, leads to a more accurate diagnosis. And an accurate diagnosis makes everything that follows, from treatment decisions to care planning, more meaningful and tailored to your loved one's specific needs now and in the future.

What happens after a diagnosis of dementia?

Receiving a dementia diagnosis is a significant moment, for your loved one and for your entire family and can bring a mix of emotions.

A diagnosis of dementia also opens the door to treatment. While there is currently no cure for most types of dementia, there are some medications that can help slow progression or manage symptoms. You may also get guidance on helpful lifestyle changes to implement and information on Ensayos clínicos underway.

It also creates space for important conversations about Directivas avanzadas while your loved one can still participate in them, about wishes for future care, legal and financial planning and what matters most to them as life changes. While these conversations are hard, they’re also among the most meaningful ones a family can have.

Your care team can connect your family with resources, support groups, social services and long-term planning tools that can make a difference in quality of life, for your loved one and for you.

And don’t forget that caregiver well-being matters too. Nearly 12 million family members and unpaid caregivers have provided an estimated 19.2 billion hours of care to people with Alzheimer's or other dementias.

You are not alone in the journey with dementia

If you've been watching and worrying, you've already done something that matters, which is paying attention. Families who seek an evaluation earlier give their loved ones the best chance at accessing care and support.

The path from noticing changes to having answers won't look the same for every family. Each step in how dementia is diagnosed has a purpose, which is to understand what's happening in your loved one's brain and how to implement the best possible care plan moving forward together.

Want to learn more about getting a diagnosis of dementia for a loved one? Find a doctor near you.