An A1c of 5.7% is not quite “good” by standard medical definitions. It falls right at the boundary between normal and prediabetes, making it the lowest possible prediabetes reading. Normal is anything below 5.7%, so a result of exactly 5.7% means your average blood sugar over the past two to three months has just crossed into a range that deserves attention, but it’s far from alarming.
Where 5.7% Falls on the A1c Scale
The American Diabetes Association breaks A1c results into three categories:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or higher
At 5.7%, you’re sitting at the very bottom edge of the prediabetes window. Using the standard conversion formula, a 5.7% A1c translates to an estimated average blood glucose of about 117 mg/dL. That’s mildly elevated but well below the diabetes threshold. Think of it as an early signal, not a diagnosis of disease.
Why Prediabetes Usually Has No Symptoms
If you feel perfectly fine and were surprised by your result, that’s typical. Prediabetes almost never causes noticeable symptoms. Most people find out through routine bloodwork, not because something felt wrong. The one physical sign that occasionally shows up is darkened patches of skin on the neck, armpits, or groin, which can indicate insulin resistance. But most people at 5.7% have no outward signs at all.
The classic symptoms people associate with diabetes, like increased thirst, frequent urination, blurred vision, and fatigue, generally don’t appear until blood sugar levels climb significantly higher, into the diabetes range.
What 5.7% Means for Your Long-Term Health
Being in the prediabetes range does carry some additional health risk beyond blood sugar alone. A study in the Journal of Clinical Endocrinology and Metabolism found that people with prediabetes had a 38% higher risk of cardiovascular events like heart attack and stroke compared to people with normal blood sugar. The same study found a more than twofold increase in risk for peripheral artery disease, a condition that restricts blood flow to the legs. Prediabetes was also linked to higher rates of heart failure.
These risks exist on a spectrum, though. Someone at 5.7% carries less risk than someone at 6.3%, and the risks are substantially lower than those faced by someone with full diabetes. The important takeaway is that elevated blood sugar doesn’t just affect blood sugar. It reflects broader metabolic changes that can stress the heart and blood vessels over time.
The Good News: 5.7% Is Highly Reversible
A 5.7% A1c is one of the easiest readings to bring back into the normal range. The landmark Diabetes Prevention Program trial showed that modest lifestyle changes, primarily losing 5% to 7% of body weight and getting about 150 minutes of moderate exercise per week, reduced the risk of progressing to type 2 diabetes by 58%. For people over 60, that figure jumped to 71%. Even after 10 years, the benefits held, with participants maintaining a 34% lower risk compared to those who made no changes.
At 5.7%, you don’t need dramatic interventions. The kinds of changes that move the needle include replacing refined carbohydrates with whole grains, adding a daily 30-minute walk, and cutting back on sugary drinks. For many people, losing just 10 to 15 pounds is enough to push A1c back below 5.7%. These same changes also lower the cardiovascular risks that come with prediabetes, so the benefit extends beyond blood sugar.
How Often to Recheck
Once you have a reading in the prediabetes range, retesting every year is standard practice. If you make lifestyle changes and want to see whether they’re working, checking again in three to six months is reasonable since the A1c reflects a rolling two-to-three-month average. A single reading of 5.7% can also be influenced by factors like illness, stress, or certain medications, so a repeat test helps confirm whether the result is consistent.
If your number stays at 5.7% or drops below it, you’re in a strong position. If it starts creeping toward 6.0% or higher despite lifestyle changes, that’s when your doctor may discuss additional options. But at 5.7%, the trajectory is very much in your control.
Putting 5.7% in Perspective
A 5.7% A1c is not a “bad” result, but it’s also not one to ignore. It means your body is starting to handle sugar a little less efficiently than it should, and catching it at this stage is genuinely valuable. Most people who act on a 5.7% result with basic diet and exercise changes never progress to diabetes. It’s the kind of number that rewards attention, not worry.