Hold the insulin. NPO means they havent eaten and can not eat before surgery. The novolog is a fast acting insulin and the client would need to eat when taking it. The levemir should also be held because it is unclear as to how long it would be before the patient would be able to eat again.
As an energy source, To heal and build and repair tissue, To sustain growth, To help transport oxygen to the cells, To regulate body functions. hope this helped :)