Learn
Learn about A1c
Short explainers. Each one links every claim to its source.
What the A1c test measures
Glucose sticks to hemoglobin. The test reads how much did, over about 3 months.
A1c, fasting glucose and GMI
Three numbers that describe blood sugar in different ways, and why they can disagree.
The prediabetes A1c range
What 5.7% to 6.4% means, how it is confirmed, and what lowered risk in the DPP trial.
A1c high, glucose normal
Six reasons the two tests disagree, and how a repeat test settles it.
How fast A1c can change
Why a week shows little, a month shows part, and about 3 months shows most of a change.
A1c goals in diabetes
Why 7% is a common goal, and when a different goal is safer.
When A1c can mislead
Anemia, blood loss, kidney or liver disease, hemoglobin variants and pregnancy.