Aclient tells the health care provider that he has been very compliant over the last 2 months in the management of his diabetes. the best diagnostic indicator that would support the client's response would be:

hemoglobin A1c (HbA1c)

Explanation:

Hemoglobin is a protein present in blood is responsible for imparting red color to blood as well as it also transfers oxygen, carbon dioxide and nutrients to different parts of the body.  

Hemoglobin A1c is a glycated hemoglobin. It is a hemoglobin which is attached with the glucose. The test for this hemoglobin is useful to evaluate the average amount of sugar(glucose) in the blood last for 2 to 3 months. This is done by measuring the percentage of glycate hemoglobin present in the blood.  

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