Glycated hemoglobin

This test, more commonly known as hemoglobin A1c, is used in the management of diabetes mellitus. Unlike checking your blood sugar, which tells you how much sugar you have in your blood right now, hemoglobin A1c gives an indication of how high it's been over the previous few months. So even if any given blood sugar check is disturbingly high or deceptively low, this test will tell you how well you've really been doing overall.