The Global Deterioration Scale (GDS) is a seven-stage rating for primary degenerative dementia, from no decline to very severe decline. Dr. Barry Reisberg of New York University developed the scale, published in 1982, and caregivers use stages 1-3 as pre-dementia and stages 4-7 as dementia stages.
The scale gives plain words for changes you see at home. As described in the Fisher Center for Alzheimer's Research Foundation's Fisher Center's 2020 clinical-stages update, it helps families match symptoms to care needs. Use it to plan help, not to diagnose alone.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What do stages 1 to 3 look like day to day?
- When does dementia begin in stage 4?
- What care do stages 5 and 6 require?
- What happens in stage 7, and what are the limits?
What do stages 1 to 3 look like day to day?
Stage 1 means no cognitive impairment and normal daily function. Stage 2 means very mild decline, when the person complains about forgetting names or where objects were placed. No clear deficit shows on interview, so others may see nothing wrong. Stage 3 means mild decline, close to mild cognitive impairment.
Others start to notice problems with finding words, concentrating, or remembering new material. The person may get lost in familiar places or perform poorly at work. For caregivers, stage 3 is the time to act early. Keep medical visits, medication lists, and finances organized in one place. Watch driving, cooking, and work tasks for safety gaps.
When does dementia begin in stage 4?
Stage 4 means moderate decline, or mild dementia. Memory for personal history weakens, and math and complex tasks become hard. As the Alzheimer's Association explains in its Alzheimer's Association stages guide, handling money and planning meals or travel often breaks down. The person may withdraw from hard or social situations.
They may deny problems or avoid challenges that expose mistakes. Families and clinicians often use this stage to mark diagnosable dementia. At this point, assign one person to track bills and appointments. Simplify choices, give step-by-step instructions, and arrange a full medical review.
What care do stages 5 and 6 require?
Stage 5 means moderately severe decline and more daily help. The person may pick the wrong clothes for weather, lose the date or home address, and forget major life details. They usually still eat, toilet, and recognize close family with cues.
Stage 6 means severe decline with rising safety needs. Help is often needed for dressing, bathing, and toileting. Memory worsens, personality may change, sleep breaks up, and wandering raises injury risk. Plan for 24-hour supervision during stage 6:.
- lock doors, stoves, cleaners, and medicines
- keep a steady sleep, meal, and bathing routine
- use simple clothing with elastic and Velcro
- keep ID, recent photo, and contacts ready for wandering
What happens in stage 7, and what are the limits?
Stage 7 means very severe decline, or late dementia. Speech and movement fade, and the person becomes fully dependent for eating, toileting, and moving. According to the National Institute on Aging's National Institute on Aging late-stage guide, swallowing can become unsafe and communication drops to a few words or none. Comfort, skin care, feeding support, and infection watch become central.
Ask the care team about hospice, feeding choices, and sensory comfort like touch and music. Keep visits short, calm, and familiar. The GDS was built around Alzheimer's disease, so other dementias may follow a different path. Stage lengths vary widely, and most people live 4-8 years after diagnosis, although some live up to 20 years.
