During a post-operative assessment, a patient's incision site appears red, swollen, and warm to the touch. What is the next best action for the nurse?

Postoperative wound infection involves bacterial colonization, localized inflammatory response, and potential progression to cellulitis or systemic infection, characterized by erythema, edema, warmth, pain, and possible purulent exudate due to immune-mediated tissue response and microbial proliferation at the surgical site. Rationale: A. Encouraging ambulation may improve overall circulation but does not address active wound infection. Increased activity can potentially exacerbate local inflammation or disrupt wound healing. It is not an appropriate response to suspected infection signs. B. Notifying the healthcare provider and preparing for wound cultures is essential to confirm infection and identify causative organisms. Early culture allows targeted antimicrobial therapy and prevents progression to systemic infection. This is the priority action when infection is suspected. C. Increasing fluid intake supports general hydration but does not treat localized infection or inflammatory processes. While hydration is important in recovery, it does not address the underlying infectious etiology of wound changes. D. Applying heat packs may increase local blood flow but can also worsen infection by promoting bacterial proliferation and increasing inflammatory spread. Heat is not recommended when infection is suspected at a surgical site.