Diagnosis of Alzheimer’s Disease - Understanding Tests and Evaluation

You notice your mother asking the same question three times within an hour. She forgets where she kept her keys, then forgets why she was looking for them. At first, you put it down to normal forgetfulness. Over time, she cannot recall what she had for breakfast or find her way home from the corner shop. For many Indian families, the path to an Alzheimer's diagnosis starts this way, with small changes that seem harmless until they begin to affect daily life.

Alzheimer's disease is the most common cause of dementia. In fact, according to Alzheimer’s Disease International, over 55 million people worldwide are living with dementia. Yet, many families delay seeking help because the early signs are easy to dismiss as normal ageing.

This article covers the diagnostic process of Alzheimer's and what happens after to help you make better decisions for yourself or someone you care for.

What Is Alzheimer's Disease?

Alzheimer's disease is a common form of dementia. The condition affects the person’s memory, thinking, and ability to perform everyday tasks. The symptoms of this progressive brain disorder grow severe enough to interfere with the daily life of an individual.

The exact cause of Alzheimer's disease is unknown. But, as per a review report from the Dementia Platform, Alzheimer’s can occur due to the accumulation of two abnormal proteins in the brain:

• Amyloid Plaques: These are Clumps of a protein fragment that accumulate between nerve cells.
• Tau Tangles:Twisted strands of another protein that build up inside cells.

These proteins interfere with the communication between neurons and even destroy them entirely. They mainly affect the hippocampus (the brain region that forms new memories) in the brain.

What are the Stages in Alzheimer's Disease?

Alzheimer's mainly occurs in three stages. Here is a quick overview of each stage and the level of care it requires:

Note: Individual progression of the condition varies widely from person to person basis the age, overall health, and how early treatment and support begin.

Who Is Most at Risk of Alzheimer's Disease?

Several factors increase the chances of developing Alzheimer's disease, though having one or more does not guarantee the condition will develop. The common risk factors are:

• Age above 65 (risk roughly doubles every five years after this age).
• Family history of Alzheimer's (in a parent or sibling).
• Cardiovascular conditions (high blood pressure, high cholesterol, and diabetes).
• History of head injury or trauma (with loss of consciousness).
• Reduced cognitive activity (little or no level of reading, learning, or social interaction).
• Smoking (reduces blood flow to the brain).
• Social isolation (faster cognitive decline in older adults).
• Untreated hearing loss (a modifiable risk factor).

Which Alzheimer's Symptoms Should You Watch Out For?

Early Alzheimer's disease symptoms are subtle and easy to overlook. If you notice several of these in yourself or a family member, reach out to their doctor immediately:

• Memory loss that affects daily life (repeatedly asking the same questions or forgetting a familiar recipe).
• Confusion with time or place, like losing track of dates, or getting lost in a familiar place.
• Problem with language, such as struggling to find the right word, or calling familiar objects by the wrong name.
• Poor judgment (neglecting personal hygiene).
• Withdrawal from social activities, hobbies, or work-related tasks.
• Mood and personality changes (anxiety, suspicion, depression, or irritability without any reason).

How Is Alzheimer's Disease Diagnosed?

There is no single test for Alzheimer’s diagnosis. The assessment has several stages carried out by a doctor or specialist in a clinic. Each step rules out possible causes and explains what is happening in the brain. Here is how Alzheimer's disease diagnosis works:

Medical History and Informant Interview

The doctor begins by talking with the patient and a close family member or caregiver. This is a standard first step, since the person affected may not notice or may underplay their own changes. The interview covers when symptoms started, how they have progressed, and their impact on daily life.

Cognitive Screening Tests

The Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA) are brief, in-clinic tests that check memory, attention, language, and orientation. These are used universally as the initial cognitive screen and take around ten minutes to complete.

Detailed Neuropsychological Testing

When screening tests suggest impairment, a neuropsychologist carries out longer, more detailed testing. The results help in measuring the effect on memory, language, or attention and distinguishing Alzheimer's from other conditions.

Physical Examination

A doctor will perform a physical examination to check your reflexes, coordination, balance, and senses. The test rules out other neurological conditions, such as Parkinson's disease or the effects of a stroke with similar symptoms.

Brain Imaging: MRI and CT scans

MRI and CT scans give detailed images of the brain's structure. They help doctors to check for shrinkage in parts of the brain linked to memory. They also rule out other causes of cognitive decline, such as strokes, tumours, or fluid build-up.

Blood Tests

Blood tests rule out reversible causes of memory loss in the individual. It includes thyroid dysfunction, vitamin B12 deficiency, and infections, where proper treatment can resolve the symptoms. Doctors suggest blood tests as a standard one before any imaging tests.

PET Scans

Positron emission tomography (PET) scans show activity inside the brain. FDG (Fluorodeoxyglucose)-PET measures how the brain uses energy, while amyloid PET can detect the build-up of amyloid protein. These scans are useful to diagnose atypical or early-onset cases.

Cerebrospinal Fluid (CSF) Analysis

A lumbar puncture (a procedure in which a needle is inserted into the lower back) collects a small sample of cerebrospinal fluid to measure amyloid and tau protein levels. This is an established biomarker test used in memory clinics to add diagnostic clarity, particularly when imaging results are unclear.

Genetic Testing

Routine APOE genetic testing is generally not recommended for diagnosing Alzheimer's disease because it indicates risk rather than confirming disease. Genetic testing may be considered in selected individuals with a strong family history or suspected inherited early-onset Alzheimer's disease, usually with genetic counselling. It is usually carried out alongside genetic counselling, since carrying the gene increases risk but does not guarantee the disease will develop.

Functional Assessment

The test assesses the person's ability to manage daily activities such as cooking, handling finances, and taking medication correctly. Doctors use the test to determine the stage of the condition to suggest the level of care and support needed at home.

What Is the SAGE Test?

The Self-Administered Gerocognitive Examination (SAGE) is a 12-question, pen-and-paper screening tool which takes about 10 to 15 minutes. Families can use it at home before seeking a formal medical opinion.

The test checks memory, reasoning, language, and problem-solving ability. However, SAGE is not a standard test for Alzheimer’s diagnosis. It is the first step to take before you seek professional help for further cognitive testing.

What Happens After an Alzheimer's Diagnosis?

Once your doctor confirms the Alzheimer’s diagnosis, you need to build a plan for care, treatment, and support. Here’s what to expect after diagnosis:

Discussing the Diagnosis and Care Planning

The doctor explains the diagnosis to the patient and family together. They will discuss what to expect at each stage. In this stage, you can begin care planning and opt for the right treatment. Also, plan for legal and financial matters, while the person can still take part in those decisions.

Treatment and Medication Options

At present, there is no cure for Alzheimer's disease. But medications are a common part of alzheimer's disease treatment. Theycan ease symptoms and help maintain quality of life in the long term. For instance, your doctor might prescribe:

• Cholinesterase Inhibitors: Maintain levels of a chemical messenger involved in memory and judgment (for the early stage),
• Memantine: Regulates another chemical involved in learning and memory (for moderate and severe stages).

Newer disease-modifying therapies targeting the amyloid protein are also being used in some specialist settings. But make sure to discuss the treatment plan with a neurologist.

Therapy and Caregiver Support Services

Cognitive stimulation therapy and occupational therapy can help maintain skills and independence for longer. Caregiver support programmes and home safety adjustments, such as removing trip hazards and labelling rooms, are an important part of ongoing management for the whole family.

How to Choose a Health Plan for Alzheimer's Care?

According to the World Dementia Council, more than 75% of Alzheimer's cases globally will occur in low and middle-income countries. In India, that means millions of families will face the financial weight of long-term care. Before choosing a health plan, here’s what to check:

• Pre-existing disease (PED) coverage: Insurers classify Alzheimer's as a pre-existing condition if it was diagnosed before the policy was purchased. Confirm the waiting period and exactly what it covers during that time.
• Diagnostic test coverage: The plan should cover the expenses of cognitive assessments, MRI scans, and PET scans.
• Domiciliary or home healthcare cover: Alzheimer's care happens at home in the later stages. Look for a plan that covers home nursing, physiotherapy, or domiciliary treatment.
• Critical illness or long-term care add-on: these provide a lump sum that covers ongoing care costs a standard hospitalisation plan may not.
• Renewal terms: Choose a lifetime renewable plan that does not introduce condition-specific exclusions at renewal.

Secure Your Health Cover While Your Mind Is Sharp

Alzheimer's disease has no cure. An early Alzheimer diagnosis, however, gives families more time to plan for best care and treatment options. If you notice persistent memory changes in yourself or a loved one, speak with a doctor and ask for proper assessment.

Reader Information: This article is intended for informational and educational purposes only and should not be considered medical advice, diagnosis, or treatment. If you or a loved one are experiencing memory loss, confusion, or other cognitive changes, consult a qualified healthcare professional for a comprehensive evaluation and personalized guidance.

FAQs

1. How do you diagnose Alzheimer's?

Alzheimer's diagnosis begins with the review of your medical history and symptoms. Then your doctor will suggest cognitive screening tests (MMSE or MoCA), blood tests and brain imaging (MRI or PET scans) to rule out other causes and determine the severity of the condition.

2. Can a blood test diagnose Alzheimer's?

No, standard blood tests cannot directly diagnose Alzheimer's disease. But they can rule out thyroid disorders or vitamin B12 deficiency, which show similar symptoms to Alzheimer's.

3. Can Alzheimer's be reversed?

No, Alzheimer's disease cannot be reversed. The damage to brain cells is permanent. But with early treatment and lifestyle changes, people can slow down the progression of symptoms in some cases.

4. At what age does Alzheimer's typically begin?

Alzheimer's disease most commonly begins after the age of 65. In rare cases, early-onset Alzheimer's can begin between the ages of 30 and 65 due to genetic factors.

5. Is Alzheimer's genetic?

Family history increases the risk of developing the condition. The APOE-e4 gene carries a higher risk. However, it doesn’t mean a person will develop the condition. Early-onset Alzheimer's has a stronger genetic link and may run more directly in families.