A nurse is reinforcing teaching about the purpose of the HbA1c test with an adolescent who has type 1 diabetes mellitus. Which of the following statements by the adolescent indicates an understanding of the teaching?

A. The HbA1c test does not check for ketones in urine. Ketone testing is separate and used to assess for diabetic ketoacidosis or inadequate insulin use, not for monitoring long-term blood glucose control. B. While the HbA1c test involves hemoglobin, it does not measure the total amount of hemoglobin in the blood. Instead, it reflects the percentage of hemoglobin that has glucose attached to it over a period of time. C. The HbA1c test does not measure oxygen levels in the blood. It specifically measures the average blood glucose level over a 2-3 month period by assessing the percentage of glucose-bound hemoglobin. D. The HbA1c test provides an indication of long-term blood glucose control, reflecting the average blood glucose levels over the past 2-3 months. It is a crucial tool for managing diabetes and monitoring the effectiveness of treatment plans.