Why do I need to know my hemoglobin a1c?

Risk increase. When the hga1c as it is commonly called, becomes uncontrolled (higher than 7.0%) the rate of retinopathy increases. The duration of uncontrol and level of uncontrol both play a factor.
Hgb A1c. Tells you how well your diabetic control is. If it's too high then there needs to be some adjustments in your therapy. .