A nurse is providing teaching to a client who recently had a hemoglobin A1c level obtained. Which of the following statements should the nurse include in the teaching?

"This lab measures your average blood glucose over a 3-month period."

"An increase in your hemoglobin A1c level indicates glycemic control."

"This lab value is a good indicator of short-term nutritional status."

"You will need to fast before getting this test."