A client's Sodium level is 128 meq/L. The nurse knows that a likely cause of this lab finding is:

After spinal fusion surgery, it is important to limit the patient's activity and movement to allow for proper healing and to prevent complications. The order to have the patient out of bed three times daily and ad lib (as desired) is not appropriate immediately after surgery.

The other orders listed are appropriate for the postoperative care of a patient who has undergone spinal fusion surgery:

• Assess neurological status every 4 hours: This is important to monitor for any changes in neurological function, which could indicate complications such as nerve damage or spinal cord compression.
• Logroll only to change position: Logrolling is a technique used to move patients with spinal fusion surgery while keeping their spine aligned and minimizing stress on the surgical site. This order is appropriate to ensure proper positioning and prevent injury to the surgical area.
• Monitor vital signs every 4 hours: Monitoring vital signs helps to assess the patient's overall condition and detect any signs of complications such as bleeding or infection.

Prednisone is a corticosteroid medication that can increase blood glucose levels by promoting gluconeogenesis (the production of glucose from non-carbohydrate sources) and reducing glucose utilization in the body. This can lead to elevated blood sugar levels, especially in individuals with diabetes. The client's history of urinary tract infection and the use of Prednisone suggest that the infection might have triggered the development of DKA.

It's important to note that DKA can occur even when a person is taking insulin as prescribed and following their diet carefully if other factors contribute to the development of DKA, such as an underlying infection or the use of certain medications like Prednisone. The nurse should further assess the client's condition and notify the healthcare provider to initiate appropriate management for DKA.