A nurse in a provider's office is monitoring the laboratory results of a client who has type 1 diabetes mellitus. Which of the following results indicates that the client demonstrates acceptable glycemic control?

The correct answer is C: HbA1c 6.8%. HbA1c reflects average blood glucose levels over the past 2-3 months. An HbA1c level of 6.8% indicates good glycemic control in a client with type 1 diabetes, as it falls within the recommended target range of 6.5-7.5%. Choices A, D, and E are measurements of blood glucose levels at a single point in time and do not provide a comprehensive view of glycemic control over time. Choice B, triglycerides, is not directly related to glycemic control and does not indicate the client's blood glucose levels.