The nurse is reviewing the laboratory results for a client who is scheduled for knee arthroplasty later in the day. Which laboratory value is most important to report to the health care provider before the surgery?

A hematocrit level of 33.4% is slightly below the normal range, which may indicate mild anemia. While this is important to monitor, it is not as urgent as a high white blood cell count, which could indicate an infection. Mild anemia can typically be managed perioperatively without significant risk. A white blood cell count of 15.5 x10/uL is significantly elevated and suggests an active infection or inflammatory process. Before proceeding with surgery, it is crucial to identify and treat any infections to prevent postoperative complications, such as sepsis. This value is the most critical to report to the healthcare provider to ensure the safety of the surgical procedure. A platelet count of 386,000 mm³ is within the normal range and does not indicate any immediate risk of bleeding or clotting disorders. Thus, this value does not necessitate urgent reporting before surgery. A hemoglobin level of 12.2 g/dL is at the lower end of the normal range, indicating borderline anemia. Although it is important to consider, it does not present as immediate a concern as a potential infection. The surgery can generally proceed with closer monitoring of the client's hemoglobin levels.