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 has gained 2 lb (0.9 kg) since yesterday.
c. The patient is scheduled for a chest x-ray in an hour.
d. The patient's blood urea nitrogen (BUN) level is 52 mg/dL.
