What test detects the average blood glucose levels over previous 3 weeks?

The test that detects the average blood glucose levels over the previous 3 weeks is called the hemoglobin A1c (HbA1c) test. This test measures the percentage of hemoglobin in your blood that has glucose attached to it. The higher your blood sugar levels, the more hemoglobin will have glucose attached to it.

The HbA1c test is a simple blood test that can be performed in a doctor's office or lab. It does not require fasting, and it provides a measure of your average blood sugar levels over the previous 3 weeks. This makes it a useful test for monitoring blood sugar control in people with diabetes.

The HbA1c test is reported as a percentage. A normal HbA1c level is below 5.7%. A level of 5.7% to 6.4% is considered prediabetes, and a level of 6.5% or higher is considered diabetes.

The HbA1c test is a valuable tool for monitoring blood sugar control in people with diabetes. By working with your doctor, you can use the HbA1c test to make adjustments to your diabetes treatment plan and keep your blood sugar levels in a healthy range.