Final answer:
HbA1c test is used to indicate blood glucose levels from preceding months.
Step-by-step explanation:
To indicate blood glucose levels from preceding months, the most appropriate test is HbA1c, also known as the A1c test. This test measures the average blood sugar levels over the past 2-3 months. It provides an indication of long-term blood glucose control and is commonly used in the management and diagnosis of diabetes mellitus.