Final answer:
The nurse should categorize the pressure ulcer with partial thickness and loss of dermis presenting as a red-pink wound bed as a Stage II pressure ulcer, which indicates an open wound without slough.
Step-by-step explanation:
The nurse will assign the pressure ulcer on the sacrum, which has partial thickness, loss of dermis, and a red-pink wound bed, as Stage II. In Stage II pressure ulcers, the skin is broken with partial-thickness loss of dermis presenting as a shallow open ulcer with a red-pink wound bed, without slough. This stage should not be used to describe skin tears, tape burns, perineal dermatitis, maceration, or excoriation.
Stage III and Stage IV ulcers involve full-thickness tissue loss with Stage III not involving underlying fascia and Stage IV involving damage to muscle, bone, or supporting structures. Stage I ulcers are characterized by intact skin with non-blanchable redness over a bony area.