Evidence guide
How Often Should A1C Be Checked With Prediabetes?
NIDDK generally recommends yearly diabetes testing after a prediabetes diagnosis, but some people may need earlier follow-up based on their results and health context.
Published 2026-08-20 · Updated 2026-08-20 · Author: Prediabetes.Life
Short answer
For someone diagnosed with prediabetes, NIDDK generally recommends testing for type 2 diabetes every year. A clinician may choose an earlier interval when results are close to the diabetes range, when tests disagree, when symptoms appear, or when other health factors make closer follow-up appropriate.
Is once a year the standard follow-up?
NIDDK states that people with prediabetes should be tested for type 2 diabetes every year. That is a general recommendation, not a rule that overrides your clinician’s judgment.
Why might a clinician repeat testing sooner?
Follow-up may be sooner when a result is close to the diabetes threshold, when different tests disagree, when there are symptoms or medication changes, or when another health condition affects how a test should be interpreted. NIDDK professional guidance notes that some people near the diagnostic range may be retested in about 3 to 6 months.
Does every follow-up have to be an A1C?
No. A1C, fasting plasma glucose, and the oral glucose tolerance test measure glucose differently. Your clinician may repeat the same test or use another test depending on the situation.
What should I track between lab checks?
You do not need to turn daily life into a laboratory. For many people, practical tracking means focusing on behaviors they can act on, such as weekly activity, meal patterns, weight when appropriate, and whether the plan is sustainable. Your clinician can tell you whether any home glucose monitoring is medically useful for you.
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