The Nurse Is Providing Care to a Postpartum Patient After

The nurse is providing care to a postpartum patient after an emergency cesarean due to eclampsia. The patient received spinal anesthesia prior to delivery. Magnesium sulfate is infusing 2 g/hr in 100 mL of IV fluid. Which assessment finding will cause the nurse to administer calcium gluconate to the patient via IV push?

A) Serum magnesium level is 10 mg/dL.
B) Patella reflexes are rated at zero.
C) Respiratory rate is 18 breaths/min.
D) Urinary output remains at 30 mL/hr.