Final answer:
The A1C test is a blood test that determines the adequacy of treatment before and after by measuring average blood glucose levels over a longer period of time.
Step-by-step explanation:
One blood test that determines the adequacy of treatment before and after is the A1C test. This test measures the average blood glucose levels over the past two to three months, providing information about how well the blood glucose is being managed over a long time. For example, in the case of diabetes mellitus, the A1C test can help assess the effectiveness of treatment in maintaining blood glucose levels within a normal range.