HbA1c 5.8%
Converted with the published ADAG regression. What it means for you is a question for a doctor, not for this page.
120 mg/dL An HbA1c of 5.8% corresponds to an estimated average glucose of about 120 mg/dL, which is 6.6 mmol/L. In IFCC units the same result is 40 mmol/mol.
Against the American Diabetes Association criteria, 5.8% is inside the prediabetes range of 5.7% to 6.4%. 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 × 5.8 − 46.7 = 119.8 mg/dL · 119.8 ÷ 18.016 = 6.65 mmol/L
(5.8 − 2.15) × 10.929 = 39.9 mmol/mol
Rounded on this page to 120 mg/dL, 6.6 mmol/L and 40 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 5.8% sits
| HbA1c (%) | mmol/mol | eAG (mg/dL) | eAG (mmol/L) | Where it sits |
|---|---|---|---|---|
| 5.3% | 34 | 105 | 5.9 | Below the prediabetes range |
| 5.4% | 36 | 108 | 6.0 | Below the prediabetes range |
| 5.5% | 37 | 111 | 6.2 | Below the prediabetes range |
| 5.6% | 38 | 114 | 6.3 | Below the prediabetes range |
| 5.7% | 39 | 117 | 6.5 | In the prediabetes range |
| 5.8% | 40 | 120 | 6.6 | In the prediabetes range |
| 5.9% | 41 | 123 | 6.8 | In the prediabetes range |
| 6.0% | 42 | 126 | 7.0 | In the prediabetes range |
| 6.1% | 43 | 128 | 7.1 | In the prediabetes range |
| 6.2% | 44 | 131 | 7.3 | In the prediabetes range |
| 6.3% | 45 | 134 | 7.4 | In 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 5.8% 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 in this range is a reason to see a doctor and follow their advice about repeating the test — not a reason to start any diet, supplement or medicine you read about online.
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 5.8% mean?
What is 5.8% HbA1c in mg/dL?
What is 5.8% 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.