what is glycohemoglobin
test overview a glycohemoglobin test or hemoglobin a1c is a blood test that checks the amount of sugar glucose bound to the hemoglobin in the red blood cells when hemoglobin and glucose bond a coat of sugar forms on the hemoglobinthat coat gets thicker when there s more sugar in the blood1c is a blood test that checks the amount of sugar glucose bound to hemoglobin the result is shown as a percentage the result of your a1c test can also be used to estimate your average blood sugar level