For most adults with type 2 diabetes, a good A1c is 7% or lower. That’s the general target recommended by the American Diabetes Association and the CDC. But “good” isn’t one-size-fits-all. Your ideal number depends on your age, overall health, how long you’ve had diabetes, and your risk of low blood sugar episodes.
What A1c Numbers Actually Mean
A1c measures the percentage of your red blood cells that have sugar attached to them. Because red blood cells live about three months, the test reflects your average blood sugar over roughly the past 90 days rather than a single moment in time. A normal A1c in someone without diabetes is below 5.7%. Prediabetes falls between 5.7% and 6.4%, and diabetes is diagnosed at 6.5% or above.
Some people with type 2 diabetes bring their A1c below 6.5% through medication, diet changes, and exercise. That doesn’t mean the diabetes is gone, but it does mean blood sugar is well managed. On the other end, an A1c consistently above 8% or 9% signals that blood sugar is running high enough to accelerate complications like nerve damage, kidney disease, and vision loss.
The Standard 7% Target
The 7% threshold exists because large clinical trials showed that keeping A1c below this level significantly reduces the risk of the small-vessel complications of diabetes: damage to the eyes, kidneys, and nerves. For a younger or middle-aged adult who is otherwise healthy, 7% or below is a solid goal, and getting closer to 6.5% offers additional protection as long as it doesn’t come with frequent low blood sugar episodes.
Pushing aggressively below 6.5% with medication, however, doesn’t always pay off. Trials that forced very tight control in people with longstanding diabetes or heart disease found more episodes of dangerously low blood sugar without a clear reduction in heart attacks or strokes. The sweet spot for most people is an A1c that’s low enough to prevent complications but not so low that it creates new risks.
When a Higher Target Makes Sense
Not everyone should chase 7%. Guidelines from the ADA, the International Diabetes Federation, and European expert panels all agree that older adults and people with other serious health conditions benefit from a more relaxed target. The reasoning is straightforward: tight blood sugar control takes years to pay off in reduced complications, and the risk of dangerous lows increases with age, kidney problems, and certain medications.
Here’s how those targets break down by health status:
- Healthy older adults (few other medical conditions, mentally sharp, living independently): A1c below 7.5%
- Adults with multiple chronic conditions or mild cognitive decline: A1c below 8%
- Frail adults, those in long-term care, or those with severe chronic illness: A1c below 8.5%, with the focus on avoiding symptoms rather than hitting a number
The American College of Physicians goes further, recommending that for people over 80, those living in nursing homes, or those with conditions like advanced kidney disease, dementia, or heart failure, clinicians should focus on keeping blood sugar low enough to prevent symptoms (excessive thirst, frequent urination, fatigue) rather than targeting any specific A1c number. At that stage, the side effects of aggressive treatment outweigh the long-term benefits.
Factors That Shift Your Personal Goal
Your doctor will consider several things when setting your target. If you were recently diagnosed and are managing with lifestyle changes alone or a single medication, aiming for closer to 6.5% is reasonable because the risk of low blood sugar is minimal. If you’ve had diabetes for 15 or 20 years and take insulin or medications that can cause lows, a target closer to 7.5% may be safer.
People who have already experienced severe hypoglycemia (episodes where they needed help from someone else to recover) generally get a more relaxed goal. The same applies if you have a physically demanding job or drive for a living, where a sudden low could be dangerous. Pregnancy is a different situation entirely, with much tighter blood sugar targets set on a case-by-case basis.
When A1c Results Can Be Misleading
A1c is reliable for most people, but certain conditions can throw the number off. Because the test depends on hemoglobin in red blood cells, anything that changes how long those cells survive or how hemoglobin behaves will skew the result.
Iron deficiency anemia can make your A1c read falsely high. Conditions that destroy red blood cells faster than normal, like hemolytic anemia or recovery from major blood loss, will make it read falsely low because the cells haven’t been around long enough to accumulate sugar. Sickle cell trait and other hemoglobin variants can also affect accuracy in either direction depending on the lab method used. Chronic kidney disease, especially in people on dialysis, tends to make A1c underestimate true blood sugar levels.
If you have any of these conditions, your doctor may use an alternative test called fructosamine or rely more heavily on home glucose monitoring to get an accurate picture of your control.
How Often to Get Tested
If you’re meeting your treatment goals, testing twice a year is typically enough. If you’ve recently changed medications, adjusted your diet significantly, or your numbers have been above target, testing every three months gives you and your doctor faster feedback. Since A1c reflects a three-month average, testing more frequently than that doesn’t add useful information.
Keep in mind that A1c is an average, which means it can mask big swings. Someone with frequent highs and frequent lows might land at a “good” A1c of 7% while experiencing dangerous variability day to day. If your A1c looks fine but you’re having symptoms of highs or lows, home blood sugar monitoring or a continuous glucose monitor can reveal patterns the A1c misses.