Table 2.

NPUAP 2016 classification of Pressure Ulcers.

Stage 1 Pressure Injury	Non-blanchable erythema of intact skin
Stage 2	Partial thickness skin loss with exposed dermis May present as intact fluid filled blister. Adipose tissue not visible at base of wound
Stage 3	Full thickness skin loss Adipose tissue exposed. Muscle, tendon or bone are not exposed. If slough or eschar obscures extent of tissue loss, this is Unstageable Pressure Injury
Stage 4	Full thickness skin and tissue loss Exposed or directly palpable fascia, muscle, cartilage, tendon or bone.
Unstageable Pressure Injury	Obscured full-thickness skin and tissue loss Tissue loss in which extent of damage cannot be confirmed due to slough/eschar. When removed stage 3 or 4 injury will be revealed
Deep Tissue Injury	Persistent non-blanchable deep red, maroon or purple discolouration Persistent sheath/friction at bone-muscle interface resulting in intact, discoloured skin. May rapidly evolve to reveal actual extent of tissue injury