Marker · Ranges for learning, not a diagnosis
HbA1c
Also called A1c, glycated hemoglobin.
The share of the oxygen-carrying protein in red blood cells (hemoglobin) that has sugar stuck to it. It estimates your average blood sugar over about three months.
Read this first
- Coach, not doctor. Aaron Cuha is a coach, not a doctor. No medical credential is claimed for him, or for these pages. A number on a blood test is something to talk over with a doctor, not something to diagnose yourself with. Nothing here is a prescription, a plan to follow, or a reason to start or stop a medicine. Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.
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Why a longevity audience asks
It is the number the owner's berberine rule waits on. It is also how doctors diagnose and track diabetes. This page will not diagnose you.
How a coach reads it
Doctors often use about 5.7 to 6.4 percent as the early blood sugar problem (prediabetes) range, and 6.5 percent and above as the diabetes range. Those are for doctors to diagnose with, not numbers you treat with a capsule at home. The owner's rule: if HbA1c or fasting blood sugar is high, talk about food, training and sleep first. Then, maybe, berberine, with the doctor who made the diagnosis. This is not a diagnosis.
Units on this page: percent, mmol/mol
When it is low
Unusually low numbers can come from a lab test problem, blood loss, or something a doctor should look at. They are not a supplement target.
When it is high
Means your average blood sugar has been high. That is a job for a doctor, not a berberine shopping list. Retest after the thing you actually changed.
Easy ways to misread it
- Low red blood cells (anemia), unusual forms of hemoglobin, and a recent blood transfusion can change A1c without changing average blood sugar.
- A1c is a three-month average. Fasting blood sugar and insulin are one morning.
- Do not stop a prescribed diabetes medicine because a capsule moved a number.
What to ask your doctor
Ask for HbA1c with fasting blood sugar. Add fasting insulin if you want to know how well your body responds to insulin, not just the average.
Related supplements
Related when-playbooks
The ranges on this page are labeled as a doctor's ranges or the owner's. They are not a trial result made up for the page. The related compound pages show the trials.