The nurse is reviewing the patient's morning laboratory results. Which of these results would the nurse be most concerned about?
A. Serum calcium level of of 10.5 mEq / L
B. Serum magnesium level of 0.8 mEq / L
C. Serum potassium level of 5 mEq / L
D. Serum sodium level of 13 5mEq / L
D. Serum sodium level of 135 mEq / L
A serum sodium level of 135 mEq / L is below the normal range of 135-145 mEq / L and could indicate hyponatremia, which can be a serious condition that may lead to neurological symptoms and complications. The nurse would be most concerned about this result and would need to monitor the patient closely and potentially notify the healthcare provider.