HbA1c 4.1%
Converted with the published ADAG regression. What it means for you is a question for a doctor, not for this page.
71 mg/dL An HbA1c of 4.1% corresponds to an estimated average glucose of about 71 mg/dL, which is 3.9 mmol/L. In IFCC units the same result is 21 mmol/mol.
Against the American Diabetes Association criteria, 4.1% is below the prediabetes range. That is a statement about a published threshold — it is not a diagnosis, and a diagnosis requires confirmation and a doctor.
Nothing here can diagnose you, and nothing here is a treatment plan. Blood glucose results are interpreted by a doctor alongside your history, your symptoms and a repeat test — a single number on a screen is not a diagnosis. If any reading concerns you, or if you feel unwell, see a doctor rather than a website.
The arithmetic
28.7 × 4.1 − 46.7 = 71.0 mg/dL · 71.0 ÷ 18.016 = 3.94 mmol/L
(4.1 − 2.15) × 10.929 = 21.3 mmol/mol
Rounded on this page to 71 mg/dL, 3.9 mmol/L and 21 mmol/mol. The equation is the ADAG regression from Diabetes Care 2008, which is the one the American Diabetes Association uses; the mmol/mol line is the NGSP master equation.
Source: Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ, for the A1c-Derived Average Glucose (ADAG) Study Group. Translating the A1C assay into estimated average glucose values. Diabetes Care 2008;31(8):1473–1478. Link
Source: National Glycohemoglobin Standardization Program (NGSP) — HbA1c and estimated average glucose (eAG). Link
Where 4.1% sits
| HbA1c (%) | mmol/mol | eAG (mg/dL) | eAG (mmol/L) | Where it sits |
|---|---|---|---|---|
| 4.0% | 20 | 68 | 3.8 | Below the prediabetes range |
| 4.1% | 21 | 71 | 3.9 | Below the prediabetes range |
| 4.2% | 22 | 74 | 4.1 | Below the prediabetes range |
| 4.3% | 23 | 77 | 4.3 | Below the prediabetes range |
| 4.4% | 25 | 80 | 4.4 | Below the prediabetes range |
| 4.5% | 26 | 82 | 4.6 | Below the prediabetes range |
| 4.6% | 27 | 85 | 4.7 | Below the prediabetes range |
Estimated average glucose is an average across roughly the previous three months. It is not a prediction of your reading tomorrow morning, and two people with the same HbA1c can have very different day-to-day swings.
What this page is careful not to say
It does not tell you whether 4.1% is good or bad for you, because that depends on things a web page cannot see — whether you have already been diagnosed, what else is on your report, whether you have a condition that makes HbA1c unreliable, and what your doctor is trying to achieve. It publishes no targets for anyone.
A result below the prediabetes range is reassuring at the moment it was taken. It is not a permanent result, and it does not mean testing never needs repeating.
PeakForm is a training and accountability programme. It is not a treatment for diabetes or prediabetes, it is not a substitute for your doctor's advice, and nothing on this site should be acted on before speaking to one.
Common questions
What does an HbA1c of 4.1% mean?
What is 4.1% HbA1c in mg/dL?
What is 4.1% in mmol/mol?
General information only — NOT medical advice, and never a diagnosis. Only a doctor can interpret your results and diagnose or treat diabetes. If a reading concerns you, see a doctor rather than a website. Every threshold, equation and glycemic index value used on this site is listed with its publication on the data & method page.