Final answer:
The A1C level can drop by about 1-2% when a patient starts taking metformin, reflecting a decrease in average blood glucose level.
Step-by-step explanation:
Initiating metformin treatment for diabetes has been associated with a notable 1-2% reduction in A1C levels, reflecting improved glycemic control. The A1C, representing a 4-month average of blood glucose, is a crucial marker for diabetes management. A 1% decrease in A1C correlates with an approximate 30 mg/dl (1.67 mmol/L) decline in average blood glucose, underscoring the significant impact of metformin on glucose regulation. Achieving and maintaining lower A1C levels through medications like metformin is integral to minimizing the risk of diabetes-related complications, emphasizing the importance of timely intervention and ongoing monitoring to support overall health and well-being.