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 rationaleThe HbA1c test measures the average blood glucose levels over the past two to three months by assessing the percentage of glycosylated hemoglobin. Hemoglobin within red blood cells binds to glucose, and the higher the blood glucose levels, the more glucose is bound to hemoglobin.Choice B rationaleThe HbA1c test does not check for ketones in the urine. Ketone testing is typically done using urine test strips, which indicate if the body is using fat for energy instead of carbohydrates, a condition that can occur in poorly managed diabetes.Choice C rationaleThe HbA1c test does not measure the amount of hemoglobin in the blood. It specifically evaluates how much glucose is attached to hemoglobin, providing insight into the effectiveness of diabetes management over a period of time.Choice D rationaleThe HbA1c test does not indicate oxygen-carrying capacity. Oxygen levels are assessed by different tests, such as arterial blood gas analysis or pulse oximetry, and are not related to the HbA1c measurement.