What does the Hemoglobin A1c Test measure?

The Hemoglobin A1c test measures the average level of glucose in the blood over the last three months. This test provides valuable information for managing diabetes by reflecting how well blood sugar levels have been controlled over time. The A1c test works by measuring the percentage of hemoglobin (a protein in red blood cells) that is coated with sugar. Higher levels indicate poorer blood sugar control, which can help healthcare providers make recommendations about treatment and lifestyle changes.

In contrast, the other options do not pertain to this specific test. Monitoring blood pressure, cholesterol levels, and the presence of ketones in urine are important in managing other health conditions but are not assessed through the Hemoglobin A1c test. Therefore, the correct answer clearly relates to the function of the A1c test in diabetes management.