A 45-year-old client with type 2 diabetes mellitus has been NPO since midnight for a scheduled cholecystectomy. The client appears highly anxious about the procedure, and the 6:00 AM blood glucose reading is 180 mg/dL. Recognizing this value in the preoperative setting, what is the nurse's best action?

Elevated preoperative blood glucose levels significantly increase surgical risks and complications.

Preoperative blood glucose management in diabetic patients is extremely important because hyperglycemia greatly increases surgical complications.

This patient's blood glucose level of 180 mg/dL exceeds the preoperative threshold. According to the American Diabetes Association and surgical guidelines, preoperative blood glucose should ideally be maintained within the range of 80-180 mg/dL, and many healthcare institutions prefer levels below 140 mg/dL for optimal surgical outcomes.

Hyperglycemia impairs immune function, delays wound healing, and increases the risk of surgical site infections. Surgical stress triggers the release of stress hormones such as cortisol and epinephrine, which tend to further elevate blood glucose. Starting surgery with already elevated blood glucose levels further increases these risks.

The nurse's priority is patient safety, so this elevated blood glucose level must be immediately communicated to the surgical team. The surgeon may postpone the surgery to stabilize blood glucose, adjust insulin therapy, or implement an intraoperative glucose management protocol. This collaborative approach ensures optimal patient outcomes and reduces perioperative complications associated with uncontrolled diabetes.

Clinical Context and Significance
In the preoperative setting, a blood glucose of 180 mg/dL in a client with type 2 diabetes who is NPO and highly anxious is not just a number to document. Anxiety triggers a physiologic stress response, releasing catecholamines and cortisol, which promote hepatic gluconeogenesis and insulin resistance, directly elevating blood glucose. The primary clinical concern is that perioperative hyperglycemia, even in non-critically ill patients, impairs leukocyte function and increases the risk of postoperative surgical site infections and poor wound healing ^[1].

Analysis of Options
Option 1: Administer the client's regular morning insulin dose as prescribed. This is a high-risk action. The client is NPO, meaning they have no exogenous source of glucose. Administering a full dose of regular or basal insulin without a concurrent dextrose infusion or a clear plan for intraoperative glycemic management can precipitate dangerous hypoglycemia during surgery, which is often masked by anesthesia. The guideline emphasizes that management requires a tailored protocol, not automatic continuation of home regimens ^[1].

Option 2: Notify the surgeon immediately about the elevated blood glucose level. This is the best action. The surgeon, often in collaboration with the anesthesia team, is responsible for directing perioperative medical management. A blood glucose of 180 mg/dL represents hospital hyperglycemia that requires a coordinated decision. The guideline highlights that ensuring adequate glycemic control is a multidisciplinary effort to reduce risks like infections and prolonged hospital stay ^[1]. The surgeon may order an insulin infusion, adjust the IV fluids to contain dextrose, or proceed with the case while implementing a specific intraoperative insulin protocol. The nurse's role is to communicate this critical finding to prevent a preventable complication.

Option 3: Document the finding and prepare the client for surgery as scheduled. This is insufficient and fails to meet the standard of care. Simply documenting an abnormal value that is known to increase the risk of postoperative complications, including in-hospital mortality, without intervening or reporting it constitutes a missed opportunity to optimize the client's safety ^[1].

Option 4: Encourage the client to drink clear fluids to help lower blood glucose. This action is contraindicated. The client is strictly NPO to prevent pulmonary aspiration during general anesthesia. Encouraging oral intake violates a critical safety order and places the client at direct risk of a life-threatening complication.

Pathophysiology and Clinical Reasoning
The core issue is the management of hospital hyperglycemia in a fasting surgical patient. The stress of surgery and the underlying illness create a state of relative insulin deficiency and increased counter-regulatory hormones. The target is not to normalize the glucose aggressively but to prevent the harms of hyperglycemia (infection, osmotic diuresis, electrolyte shifts) while strictly avoiding hypoglycemia. The guideline's position is that a systematic, protocol-driven approach initiated by the perioperative team is essential ^[1]. By notifying the surgeon, the nurse activates this system, ensuring that the client’s intraoperative glycemic management is proactively planned rather than reactive.