Final answer:
A nurse should regularly monitor glycosylated hemoglobin (A1c), typically every 3 to 6 months, as it reflects the average blood glucose level over the past 3 to 4 months and is critical in evaluating and managing diabetes.
Step-by-step explanation:
For the evaluation of clients with poor glycemic control in persons aged 18 and older, a nurse should expect to monitor glycosylated hemoglobin (A1c). This test should be performed during an initial assessment and at regular intervals thereafter to maintain effective diabetes management. Notably, A1c testing is recommended every 3 to 6 months depending on individual needs and the level of glycemic control. Specifically, for individuals with poorly controlled glycemia, the test is often performed at no longer than 3-month intervals. The A1c level reflects the average blood glucose level over the previous 3 to 4 months and is critical for adjusting treatment plans to mitigate the risk of diabetes complications related to eyes, kidneys, and nerves. It provides a clear indicator of how well a person's blood glucose levels have been managed over a period and helps to diagnose and track the progress of diabetes mellitus.