Blood Test Might Reveal Dementia

Overview

Dementia is a group of symptoms that affect memory, thinking, and social abilities. A new blood test looks for certain proteins in the blood that may be linked to dementia, such as Alzheimer's disease. This test is still being studied and is not yet a routine tool for everyone.

Dementia is very common worldwide. It affects millions of people, and the risk increases as you get older. However, it is not a normal part of aging.

Dementia mostly affects adults over the age of 65, but it can also affect younger people in rare cases, especially those with certain genetic conditions or other health problems.

Symptoms

Common symptoms

• Forgetting recent events or conversations
• Difficulty finding the right words
• Getting lost in familiar places
• Trouble solving problems or making decisions
• Changes in mood or behavior

Causes

Main causes

• Alzheimer's disease – the most common cause, linked to protein buildup in the brain
• Vascular dementia – caused by reduced blood flow to the brain
• Lewy body dementia – caused by abnormal protein deposits in the brain
• Frontotemporal dementia – damage to the front and side parts of the brain

Risk factors

• Older age
• Family history of dementia
• High blood pressure or diabetes
• Smoking or heavy drinking
• Poor diet or lack of physical activity

When to see a doctor

See a doctor urgently if:

• If someone suddenly becomes very confused, has a stroke-like symptom like face drooping or arm weakness, or cannot be woken, call emergency services immediately.

Book a routine appointment if:

• If you or a loved one has memory problems that are getting worse and affecting daily activities, make an appointment with a doctor.

Diagnosis

Doctors diagnose dementia by listening to your symptoms, doing a physical exam, and testing your thinking and memory. A new blood test can look for proteins linked to Alzheimer's disease, but it is not used alone – it is combined with other checks.

Tests that may be done

• Memory and thinking tests (cognitive assessments)
• Blood tests, including newer protein biomarker tests
• Brain scans, such as MRI or CT scans

What to expect at your appointment

Bring a family member or friend to help you remember what the doctor says. The doctor will ask about your daily life, any medicines you take, and how symptoms started. Blood tests are quick and rarely cause more than a brief sting.

Treatment

There is no cure for most types of dementia, but there are treatments and support that can help manage symptoms, slow decline, and improve quality of life.

Self-care at home

• Keep a daily routine and use memory aids like calendars and notes
• Stay socially active – meet friends or join a group
• Make your home safe, such as using labels and removing trip hazards
• Talk to your family about how you feel and what help you need

Medical treatments

Depending on the type of dementia, a doctor may suggest medications to manage memory, behavior, or mood. These are always tailored to the individual. Talk to your doctor about what options are right for you.

When is surgery considered?

Surgery is not a treatment for dementia itself, but it may be used for conditions that can cause dementia-like symptoms, such as a brain tumor or normal pressure hydrocephalus (fluid on the brain).

Living with this condition

A structured routine helps make life feel calmer and more familiar. Use labels, a whiteboard, or a daily checklist. Keep important items like keys and glasses in the same place every time.

Lifestyle tips

• Stay active – even a short daily walk can help
• Keep your brain engaged with hobbies, puzzles, or reading
• Avoid smoking and limit alcohol
• Get enough sleep and rest during the day as needed

Diet and exercise

A balanced diet rich in vegetables, fruits, whole grains, and healthy fats supports brain health. Regular physical activity, such as walking or gentle exercise, can improve mood and keep the body strong.

Mental health and emotional wellbeing

Dementia can bring feelings of anxiety, sadness, or anger. It is normal to grieve the changes. Talk to your doctor, a counselor, or a trusted friend. You do not have to face it alone.

Prevention

You cannot always prevent dementia, but healthy habits can lower your risk. Controlling blood pressure, keeping blood sugar in check, staying socially connected, and staying physically active all make a difference.

Vaccines

Staying up to date with vaccinations helps prevent infections that could affect overall health, but no vaccine prevents dementia itself.

Screening programmes

There is no routine screening for dementia in all adults. The new blood test may help in the future, but it is still being studied and is not yet a standard screening test.

Complications

If left untreated

• Difficulty performing daily tasks like cooking or managing money
• Higher risk of falls and injuries
• Poor nutrition or dehydration if eating and drinking become difficult
• Infections, such as pneumonia, in later stages

Long-term outlook

A dementia diagnosis is serious, but many people live well for years with the right support. Early detection – including through new blood tests – can help you get support sooner. There is hope for maintaining a meaningful and dignified life.

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