The five stages of dementia are as follows, according to Healthline. Stage 1: CDR-0 or no impairment; stage 2, CDR-0.5 or questionable impairment; stage 3: CDR-1 or mild impairment; stage 4: CDR-2 or moderate impairment; and stage 5: CDR-3 or severe impairment. These stages evaluate the patient’s functioning in six areas.
The six areas of functioning taken into account for the five stages of dementia are judgment, memory, orientation, community, home and hobbies, and personal care, Healthline explains. As a patient progresses along the stages, their symptoms grow more severe. At stage 1, there is no damage to the patient’s ability to function whatsoever; the patient is well-adjusted at home and in the world at large; has no issues with memory; and is fully aware of time and place. At stage 2, the patient may exhibit slight difficulties, such as failing to handle timing well or failing to perform at full capacity in the workplace, but he is fully independent. At stage 3, the patient may not be able to function independently in some areas of life; following directions and maintaining knowledge of time and place becomes problematic. At stage 4, the patient needs significant help but can function autonomously in some settings. Short-term memory capacity is greatly reduced, and the patient is likely to be highly disoriented. At stage 5, the patient is completely dependent on others, suffers significant damage to memory and usually shows very little understanding of the world around him.