What usually happens next
It's usually confirmed by repeating the A1C or adding a fasting glucose, and then rechecked about once a year.
In the Diabetes Prevention Program, people with prediabetes who lost about 7% of their weight and walked about 150 minutes a week cut their chance of developing diabetes by 58% over about 3 years.
When an A1C can read wrong
A1C counts sugar stuck to red blood cells over their roughly three-month life, so anything that changes how long those cells live can move it without your glucose changing: anaemia, iron deficiency, kidney disease, pregnancy, a recent blood transfusion, and some haemoglobin variants. If your A1C and your glucose readings don't agree, that's usually why, and a fasting glucose or fructosamine can settle it.
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Questions
Is an A1C of 5.9% good?
5.9% is in the prediabetes range (5.7 to 6.4%). It isn't diabetes, and it's the stage where changes in weight, activity and sleep shift the odds the most.
What average blood sugar is an A1C of 5.9%?
About 123 mg/dL (6.8 mmol/L). In the ADAG study, 95% of people with this A1C had an average between 98 to 149 mg/dL.
What is 5.9% in mmol/mol?
41 mmol/mol. Many countries print A1C in mmol/mol (the IFCC unit) rather than percent.
Can an A1C of 5.9% go back to normal?
It can. In the Diabetes Prevention Program, people with prediabetes who lost about 7% of body weight and walked about 150 minutes a week cut their chance of developing diabetes by 58% over about 3 years.
Worked out by LifeFrom from the ADA standards and the ADAG study, and not yet reviewed by a clinician. For your own understanding: only a lab test, read by your clinician, diagnoses anything.