If you HbA1c levels are high, it may be a sign of diabetes, a chronic condition that can cause serious health problems, including heart disease, kidney disease, and nerve damage. A Hemoglobin A1c (HbA1c) panel measures the amount of blood sugar (glucose) attached to hemoglobin. Hemoglobin in your red blood cells carries oxygen from your lungs to the rest of your body. This panel reveals the average amount of glucose attached to hemoglobin over the past three months. This test is pain-free and easy-to-use, enabling you to conveniently test from the comfort of home.