Glycosylated Hemoglobin
(HbgA1C)

Alternate Names

  • A1C and Estimated Average Glucose (eAG)
  • Hemoglobin A1c
  • HbA1c
  • Glycohemoglobin
  • Glycolated Hemoglobin
  • Diabetic Control Index

Blood sugar (glucose) is normally bound to RBCs and transport to the cells for energy. A larger amount of glucose binds to RBCs when blood sugar levels are high over a long period of time, which can then be measured. Since RBCs live for up to 120 days, the amount of glycosylated hemoglobin is an indication of blood sugar levels over this timeframe. These levels are used to determine how long you have had diabetes mellitus (DM)when you are first diagnosed, and how well you are following your diet and medication schedule. Normal levels will vary according to the lab that is doing the testing.

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