The Nurse Obtains the Following Information About a Client Before

The nurse obtains the following information about a client before administration of metformin. Which of the following findings indicate a need to contact the health care provider before giving the metformin?

A) The client's blood glucose level is 9.2 mmol/L.
B) The client's blood urea nitrogen (BUN) level is 21.4 mmol/L.
C) The client is scheduled for a chest x-ray in an hour.
D) The client has gained 1 kg since yesterday.