Final answer:
The nurse should report the serum sodium level of 150 mEq/L to the provider as it indicates hypernatremia, a condition that requires medical attention. The other values listed are within normal ranges.
Step-by-step explanation:
The nurse should report finding D. Serum sodium level of 150 mEq/L to the provider. Normal serum sodium levels are between 135-145 mEq/L; a level of 150 mEq/L indicates hypernatremia, which means the sodium concentration in the plasma is higher than normal. This condition requires medical intervention. On the other hand, a serum potassium level of 3.8 mEq/L (option A), blood pressure of 120/80 mm Hg (option B), and urine output of 50 mL/hour (option C) are all within normal ranges for an adult and would not typically raise concerns.