Final answer:
The ADA recommends that all diabetic patients have the A1C test quarterly to monitor long-term blood glucose levels, as it reflects average levels over the previous two to three months.
Step-by-step explanation:
The American Diabetes Association (ADA) recommends that all clients with diabetes undergo the glycated hemoglobin (A1C) test quarterly. The A1C test is essential for monitoring the long-term control of blood glucose levels in patients with diabetes. It provides an average blood glucose level over the past two to three months, presenting a more comprehensive picture of how well diabetes is being managed as opposed to a single-point serum glucose test. This is particularly critical since blood glucose levels can fluctuate over a day and are affected by many factors, including food intake and fasting.