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www.healthline.com/health/type-2-diabetes/ac1-test

A1C measures the amount of hemoglobin in the blood that has glucose attached to it. Hemoglobin is a protein found inside red blood cells that carries oxygen to the body. Hemoglobin cells are ...

diabetes.org/.../treatment-and-care/blood-glucose-control/a1c

A1C and eAG. The A1C test gives you a picture of your average blood glucose (blood sugar) control for the past 2 to 3 months. The results give you a good idea of how well your diabetes treatment plan is working.

www.webmd.com/diabetes/guide/glycated-hemoglobin-test-hba1c

The hemoglobin A1c test tells you your average level of blood sugar over the past 2 to 3 months. ... so the test shows the average level of glucose in your blood for the past 3 months.

labtestsonline.org/tests/hemoglobin-a1c

The A1c test evaluates the average amount of glucose in the blood over the last 2 to 3 months by measuring the percentage of glycated hemoglobin in the blood. Hemoglobin is an oxygen-transporting protein found inside red blood cells (RBCs).

www.niddk.nih.gov/.../overview/tests-diagnosis/a1c-test

The A1C test is sometimes called the hemoglobin A1C, HbA1c, glycated hemoglobin, or glycohemoglobin test. Hemoglobin is the part of a red blood cell that carries oxygen to the cells. Glucose attaches to or binds with hemoglobin in your blood cells, and the A1C test is based on this attachment of glucose to hemoglobin.

medlineplus.gov/lab-tests/hemoglobin-a1c-hba1c-test

A hemoglobin A1c (HbA1c) test measures the amount of blood sugar (glucose) attached to hemoglobin. Hemoglobin is the part of your red blood cells that carries oxygen from your lungs to the rest of your body.

www.mayoclinic.org/tests-procedures/a1c-test/about/pac...

The A1C test is a common blood test used to diagnose type 1 and type 2 diabetes and to monitor how well you're managing your diabetes. The A1C test goes by many other names, including glycated hemoglobin, glycosylated hemoglobin, hemoglobin A1C and HbA1c.

www.medicinenet.com/hemoglobin_a1c_test/article.htm

Hemoglobin A1c is a protein on the surface of red blood cells that sugar molecules stick to, usually for the life of the red blood cell (about three months).; The higher the level of glucose in the blood, the higher the level of hemoglobin A1c is detectable on red blood cells. Hemoglobin A1c levels correlate with average levels of glucose in the blood over an approximately three-month time.

www.everydayhealth.com/type-2-diabetes/treatment/ways...

The A1C test measures the glucose (blood sugar) in your blood by assessing the amount of what’s called glycated hemoglobin. “Hemoglobin is a protein within red blood cells.

www.medicalnewstoday.com/articles/265443.php

Fast facts on the A1C test. A1C measures glycated hemoglobin, which forms when glucose attaches to a protein in red blood cells. An initial diagnosis of diabetes is made if A1C levels are 6.5 ...