Which of These Laboratory Results Would Be Most Important for a Nurse

Which of these laboratory results would be most important for a nurse to monitor for a patient who has lower abdominal pain and urinary urgency?

A) serum creatinine 1.20 mg/dL
B) urine Osmolality 400 mOsm/kg H₂O
C) BUN 30 mg/dL
D) urine culture 150,000 organisms/mL