A nurse is caring for a child who has an exacerbation of cystic fibrosis. Which of the following laboratory findings should the nurse report to the provider immediately?

D. An oxygen saturation level of 85% is significantly below the normal range and indicates hypoxemia (low blood oxygen levels). This finding is concerning, especially in a child with cystic fibrosis, which can lead to respiratory complications such as airway obstruction, infection, or mucus plugging. A. A blood glucose level of 140 mg/dL is within the normal range for children, so this finding would not typically require immediate reporting to the provider. B. A serum sodium level of 156 mEq/L is significantly elevated and above the normal range. However, hypoxia is the priority. C. A red blood cell (RBC) count of 3.2 million/µL falls within the normal range for children, so this finding would not typically require immediate reporting to the provider.