Problem: Azami, a 10-year-old boy with a history of cystic fibrosis, is admitted to the general pediatrics unit of a local hospital after presenting to his primary care physician with a 2-day history of fever and productive cough. His medical record lists him at 4' 2" tall with a weight of 50 lb. Vital signs show a temperature of 101 °F (38.3 °C), heart rate of 110 bpm, and respiratory rate of 23 /min. The admitting team orders laboratory studies, which show a white blood cell count of 18,000/µm, blood urea nitrogen of 10 mg/dL, and an SCr of 0.9 mg/dL. The nephrology team advises caution when using Azami's SCr to assess renal function. Which of the following factors is most likely contributing to the nephrology team's hesitancy to use SCr to assess kidney function in this patient? Need Professional Help? A. His age B. Presence of fever C. Positive systemic inflammatory response syndrome (SIRS) criteria D. His nutritional status