Which Finding Indicates a Need to Contact the Health Care

Which finding indicates a need to contact the health care provider before the nurse administers metformin (Glucophage) ?

A) The patient's blood glucose level is 174 mg/dL.
B) The patient is scheduled for a chest x-ray in an hour.
C) The patient has gained 2 lb (0.9 kg) in the past 24 hours.
D) The patient's blood urea nitrogen (BUN) level is 52 mg/dL.