HbA1c is an indicator of blood sugar levels by measuring the amount of blood sugar that is attached to your red blood cells. Testing your HbA1c levels can give you insight into what your average blood sugar level was over the past two to three months. This can be very helpful for people managing diabetes or prediabetes. There are a lot of factors that can influence blood sugar and diabetes monitoring—keep reading to learn more about HbA1c from medical experts, plus find out more about our HbA1c Test.