What are the six stages of pressure injuries as described in the chapter on Skin and Lymphatic Disorders?

The six stages of pressure injuries are Stage 1, Stage 2, Stage 3, Stage 4, Unstageable, and Deep Tissue Pressure Injury (DTPI).

Pressure injuries are categorized into six stages based on the extent of tissue damage. Stage 1 involves intact skin with nonblanchable erythema. Stage 2 is partial thickness skin loss with exposed dermis. Stage 3 involves full thickness skin loss where adipose tissue is visible. Stage 4 includes full thickness skin and tissue loss with exposed fascia, muscle, or bone. Unstageable injuries have full thickness skin and tissue loss obscured by slough or eschar. Deep Tissue Pressure Injury (DTPI) involves intact or nonintact skin with persistent nonblanchable deep discoloration or blood-filled blister.