A client with diabetic ketoacidosis (DKA) is receiving an IV infusion of 0.9% sodium chloride and insulin.
Two hours later, the client’s serum laboratory results show a decrease in the serum blood glucose from 580 to 430 mg/dL (32.2 to 23.86 mmol/L). What additional laboratory result is most important for the nurse to monitor?

Choice A rationale
Sudden onset of confusion in an older adult could be a sign of a urinary tract infection (UTI). UTIs can cause delirium and behavioral changes in older adults. Therefore, asking if the client is experiencing any pain with urination could help identify a potential UTI.
Choice B rationale
While high protein foods are generally beneficial for health, there is no direct link between increased intake of high protein foods and sudden onset of confusion. Therefore, this option is not the most appropriate action in this situation.
Choice C rationale
Reviewing the client’s current food and medication allergies is always important in healthcare settings. However, it may not directly address the sudden onset of confusion unless the client has had a recent change in diet or medication that could have triggered an allergic reaction leading to confusion.
Choice D rationale
A recent fall could potentially cause a sudden change in mental status due to a head injury or other trauma. Therefore, determining if the client has recently experienced a fall is an appropriate action.
Choice E rationale
Fever can cause confusion, especially in older adults. Therefore, providing instruction on taking the client’s temperature can help the caregiver monitor for signs of infection that could be contributing to the client’s confusion.

Choice A rationale
A chest x-ray is a critical diagnostic tool for a patient presenting with flu-like symptoms, fever, chest congestion, and increased breathing difficulties. It can help identify conditions such as pneumonia or other lung diseases, which could be causing the patient’s symptoms.
Choice B rationale
While hydration is important, running a 0.9% sodium chloride IV infusion at 150 mL/hour is not the most immediate need for this patient. The patient’s symptoms are primarily respiratory, and there is no indication of dehydration.
Choice C rationale
A sputum culture could be useful for diagnosing bacterial infections of the respiratory tract. However, it is not the most immediate need for this patient, as the results of a culture test can take time to come back.
Choice D rationale
This is the correct answer. Given the patient’s increased breathing difficulties, starting oxygen therapy can help improve the patient’s oxygen levels and ease their breathing.
Choice E rationale

Starting a peripheral IV might be necessary for administering medications or fluids, but it is not the most immediate need in this scenario.
Choice F rationale
While controlling the patient’s fever is important, it is not as immediate a need as performing a chest x-ray and starting oxygen therapy.