A nurse assesses a client with diabetes mellitus 3 hours after a surgical procedure and notes the client's breath has a "fruity" odor. Which action should the nurse take?

Choice A rationale: Encouraging incentive spirometry is a pulmonary intervention designed to prevent atelectasis and pneumonia by promoting deep breathing. While important post-surgically, it does not address the metabolic emergency indicated by the fruity breath odor, which is a classic sign of excessive ketone production from fat metabolism due to severe insulin deficiency. Choice B rationale: Increasing intravenous fluids could worsen fluid overload in a dehydrated client without addressing the underlying metabolic imbalance. Although fluid resuscitation is part of the treatment for severe hyperglycemia, the primary intervention involves insulin administration to correct the metabolic derangement and halt ketone production, which is the root cause of the fruity odor. Choice C rationale: The fruity breath odor is caused by the exhalation of acetone, a type of ketone body produced during lipolysis when glucose is unavailable for cellular energy. This indicates the body is in a state of ketoacidosis, a life-threatening complication of uncontrolled diabetes. Consulting the provider for immediate testing and treatment is the priority action. Choice D rationale: Performing meticulous pulmonary hygiene, such as suctioning and chest physiotherapy, is indicated for clients with respiratory secretions or compromised lung function. While important for general post-operative care, it does not address the specific metabolic emergency of ketoacidosis indicated by the fruity breath odor, which requires immediate medical intervention.