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?

Choice A rationaleHbA1c testing does not measure oxygen-carrying capacity. Instead, that is assessed by the hemoglobin or oxygen saturation levels. HbA1c specifically evaluates glycosylated hemoglobin, indicating average blood glucose levels over time.Choice B rationaleTesting for urinary ketones is a separate diagnostic test used to detect ketoacidosis, a complication of diabetes. HbA1c does not assess ketones but reflects long-term glycemic control by analyzing glucose bound to hemoglobin.Choice C rationaleHbA1c does not measure total hemoglobin but rather the percentage of hemoglobin bound to glucose. Therefore, this test provides insight into blood sugar levels rather than the actual quantity of hemoglobin in the blood.Choice D rationaleThe HbA1c test reflects blood sugar control over the past 2-3 months by measuring the proportion of glycosylated hemoglobin. This provides a long-term overview of glucose management, crucial for optimizing treatment in diabetes mellitus.