HbA1c 5.7%: what your result means
An HbA1c of 5.7% is the very first value in the band the American Diabetes Association calls prediabetes, which runs from 5.7% to 6.4%. It is not the diabetes range, and it sits only a hair above the normal cut-off, pointing to an average blood sugar of about 117 mg/dL (6.5 mmol/L) over the past two to three months. Values this close to a line often shift a little on a repeat test, because labs and methods vary slightly, so being re-tested is normal and not a bad sign.
5.7% in conventional NGSP/DCCT units is about 39 mmol/mol in SI (IFCC) units, the form used on many lab reports outside the United States. The matching estimated average glucose (eAG) is about 117 mg/dL, or 6.5 mmol/L.
What this test measures
HbA1c looks at haemoglobin, the protein inside red blood cells that carries oxygen. Sugar in your blood sticks to it in small amounts and stays stuck for the life of the cell. Red blood cells last around three to four months, so this test shows an average of your blood sugar over roughly the last two to three months rather than a single moment. No fasting is needed, and one heavy meal or one stressful week will not swing it much.
Where 5.7% sits
The American Diabetes Association Standards of Care use three bands: below 5.7% (below 39 mmol/mol) is normal, 5.7% to 6.4% (39 to 46 mmol/mol) is called prediabetes, and 6.5% (48 mmol/mol) or above is the diabetes range. A result of 5.7% (39 mmol/mol) lands on the very bottom edge of the middle band, as close to normal as a prediabetes-range result can be. Prediabetes is a label for a range of numbers, not a disease you have been diagnosed with, and only a doctor who can see your whole picture can tell you what this result means for you. If you are pregnant or might be, these bands do not apply to you: HbA1c is not used to diagnose gestational diabetes, which is screened for separately with a glucose tolerance test at a set point in pregnancy. Ask your maternity team whatever this number says.
What to do next
- Show the full report to the doctor who ordered it, and mention any symptoms and your family history. A borderline number is read in context, never on its own.
- Ask whether the test should be repeated, and when. A single value is a snapshot, labs differ a little from one another, and results sitting right on a cut-off are the ones most worth confirming.
- Ask whether anything could have pushed this result up or down. Anaemia, low iron, recent blood loss or a transfusion, pregnancy, kidney or liver problems, and inherited haemoglobin differences such as sickle cell trait or thalassaemia can all affect it.
- Ask whether any other check is worth doing, such as a fasting blood sugar or a glucose tolerance test, which look at your sugar in a different way.
- Write down your questions about eating, movement, sleep and stress before you go, so your doctor can tell you what makes sense for your situation rather than general advice from the internet.
Common questions
Does 5.7% mean I have diabetes?
No. 5.7% is below 6.5%, the level where the ADA's diabetes range begins. It is the first value in the middle band, the one called prediabetes. That band is a signal to look more closely, not a diagnosis, and no web page can diagnose you. Your doctor is the one who decides what it means for you.
Is 5.7% really different from 5.6%?
Biologically, barely at all. The cut-off has to be drawn somewhere, and 5.6% and 5.7% are practically the same amount of sugar stuck to your red blood cells. Labs also vary by a couple of tenths of a percent, so the same sample can land either side of the line. That is why doctors look at the trend over time rather than one digit.
Can an HbA1c in this band come back down?
HbA1c is an average that moves as your blood sugar changes, so it can go up or down over the following months. Nobody can promise you which way yours will go, and this page will not name anything you should take or do. What is realistic for you is a conversation with your doctor, who knows your full history.
What does prediabetes actually mean?
It is the name guideline bodies give to a range of results that sit above the usual range but below the diabetes range. It means the average amount of sugar in your blood is a little higher than typical. It is a reason to talk to a doctor and keep an eye on things, not a reason to panic, and many people in this band feel completely well.
How soon should the test be repeated?
That is your doctor's call. Because HbA1c reflects two to three months, repeating it too soon does not show much. Ask what interval they want and whether they would like any other test alongside it.