For most non-pregnant adults with diabetes, the recommended A1c level is below 7%. That target comes from the American Diabetes Association and reflects a balance between keeping blood sugar low enough to prevent complications and avoiding the risks of pushing it too low. But “most adults” doesn’t mean everyone, and your ideal number may be higher or lower depending on your age, health, and how long you’ve had diabetes.
What an A1c of 7% Actually Means
The A1c test measures the percentage of your red blood cells that have glucose attached to them. Because red blood cells live about three months, the result captures your average blood sugar over roughly that same window. An A1c of 7% translates to an estimated average blood sugar of about 154 mg/dL. For comparison, an A1c of 6% corresponds to roughly 126 mg/dL, and 8% corresponds to about 183 mg/dL.
That distinction matters because small shifts in A1c represent meaningful changes in daily blood sugar. Dropping from 8% to 7% means your average glucose fell by nearly 30 mg/dL, which over years significantly reduces the risk of nerve damage, kidney disease, and vision problems.
When a Higher Target Makes Sense
The under-7% goal assumes you can reach it safely, without frequent episodes of dangerously low blood sugar. For some people, aiming that low creates more risk than benefit. Older adults with multiple chronic conditions, mild to moderate cognitive impairment, or difficulty managing daily tasks on their own are generally advised to aim for an A1c below 8% instead. That slightly looser target still protects against the worst effects of high blood sugar while reducing the chance of hypoglycemia, which can cause falls, confusion, and hospitalization in older or frailer adults.
For people in very poor health, with severe cognitive impairment or end-stage chronic illness, the focus shifts away from A1c entirely. The priority becomes avoiding both dangerously low blood sugar and symptoms of very high blood sugar, rather than chasing a specific percentage.
Tighter Targets for Some People
On the other end of the spectrum, some adults benefit from aiming lower than 7%. If you were recently diagnosed, are younger, have a long life expectancy, and can reach a lower number without hypoglycemia, your care team may set your goal closer to 6.5% or even the normal range. The logic is straightforward: decades of even modestly elevated blood sugar compound into serious damage, so starting tight and early pays off.
During pregnancy, the target drops to below 6%, as long as that level can be maintained without significant low blood sugar episodes. Blood sugar crosses the placenta and affects fetal development, so tighter control during those months reduces the risk of complications for both mother and baby.
Conditions That Skew A1c Results
The A1c test assumes your red blood cells have a normal lifespan of about 120 days. Anything that changes how long those cells survive can push the number artificially high or low, giving you a misleading picture of your actual blood sugar control.
Iron deficiency anemia is one of the most common causes of a falsely elevated A1c. When your body produces fewer new red blood cells, the existing ones circulate longer and accumulate more glucose, inflating the reading. Vitamin B12 and folate deficiency anemias have the same effect. Kidney disease with uremia can also push results higher than they should be.
Conditions that shorten red blood cell life do the opposite. Significant blood loss, hemolytic anemia (where red blood cells break down faster than normal), and an enlarged spleen can all produce falsely low A1c results. Advanced kidney disease, somewhat counterintuitively, often lowers A1c because the chronic anemia it causes accelerates red blood cell turnover. Pregnancy also shortens red blood cell lifespan from about 120 days to roughly 90, which is one reason A1c during pregnancy requires careful interpretation.
Hemoglobin variants, particularly hemoglobin S (associated with sickle cell disease) and hemoglobin C, can shift results in either direction depending on the specific variant and the lab method used. If you carry two copies of an abnormal hemoglobin gene, standard A1c tests are generally unreliable. If you carry one copy (sickle cell trait, for example), testing can still work as long as the lab uses an appropriate method. If you know you have a hemoglobin variant, mention it to your care team so they can choose the right test or use alternative measures of blood sugar control.
How Often to Get Tested
If your blood sugar is stable and you’re meeting your target, testing twice a year is typically sufficient. If your treatment recently changed, you’re not yet at goal, or your diabetes management is in flux, testing every three months gives your care team a clearer picture of whether adjustments are working. Because the test reflects a roughly 90-day average, checking more often than every three months won’t capture new information.
The A1c is a trend line, not a snapshot. A single result that’s slightly above or below target isn’t necessarily cause for alarm, especially if your previous results have been consistent. What matters most is the pattern over time and whether you’re moving in the right direction.