what blood test shows a1c

The A1C test, also known as the hemoglobin A1C or HbA1c test, is a blood test that measures your average blood sugar levels over the past 2 to 3 months. It does this by assessing the percentage of your red blood cells that have sugar-coated hemoglobin.

• How it works: Glucose in your blood attaches to hemoglobin, a protein in red blood cells. The A1C test measures the percentage of hemoglobin that has glucose attached to it.
• Purpose: This test is used to diagnose prediabetes and diabetes, as well as to monitor how well your diabetes is being managed.
• Frequency: People with diabetes typically have this test at least twice a year.

For more details, you can visit the CDC's A1C Test page.