A Patient Who Has Diabetes and Uses Insulin to Control

A patient who has diabetes and uses insulin to control blood glucose has been NPO since midnight before having a knee replacement surgery. Which action should the nurse take?

A) Withhold the usual scheduled insulin dose because the patient is NPO.
B) Obtain a blood glucose measurement before any insulin administration.
C) Give the patient the usual insulin dose because stress will increase the blood glucose.
D) Give half the usual dose of insulin because there will be no oral intake before surgery.