For most adults with diabetes, the target blood sugar range is 80 to 130 mg/dL before meals, according to the American Diabetes Association. After eating, the goal is to stay below 180 mg/dL. These numbers serve as a general framework, but your ideal targets may be tighter or more relaxed depending on your age, health status, and whether you’re pregnant.
Before and After Meals
The two checkpoints that matter most in daily blood sugar management are pre-meal and post-meal readings. Before eating, your blood sugar should fall between 80 and 130 mg/dL. One to two hours after the start of a meal, it should be under 180 mg/dL. These targets apply to most nonpregnant adults with either Type 1 or Type 2 diabetes.
Post-meal timing matters more than people realize. The clock starts when you begin eating, not when you finish. If you check too early or too late, you’ll get a reading that doesn’t reflect your true post-meal peak. Most guidelines reference the one- to two-hour window because that’s when blood sugar typically hits its highest point after a meal.
A1C: The Bigger Picture
While daily readings show what’s happening right now, your A1C reflects your average blood sugar over the past two to three months. The goal for most adults with diabetes is an A1C below 7%, which corresponds to an estimated average blood sugar of roughly 154 mg/dL. Think of A1C as your overall grade, while individual glucose checks are the daily quizzes.
There’s no universal A1C number that works for everyone. Your doctor may set a lower target (closer to 6.5%) if you’re younger, recently diagnosed, or managing diabetes without medications that cause low blood sugar. On the other hand, a higher target might be appropriate if you have a long history of diabetes, are prone to dangerous lows, or have other serious health conditions.
Targets During Pregnancy
Pregnancy calls for significantly tighter blood sugar control. For women with gestational diabetes or pre-existing diabetes during pregnancy, the recommended fasting level is below 95 mg/dL. After meals, the target is below 140 mg/dL at one hour or below 120 mg/dL at two hours. These stricter thresholds protect fetal development and reduce the risk of complications like high birth weight and preeclampsia.
Targets for Children and Teens
Children and adolescents with diabetes follow slightly different guidelines. Without a continuous glucose monitor, the recommended pre-meal range is 70 to 144 mg/dL, and post-meal readings should stay between 70 and 180 mg/dL. For kids using continuous monitoring or automated insulin delivery systems, the goal is to spend more than 70% of the day between 70 and 180 mg/dL, with less than 4% of time spent below 70 mg/dL.
A1C targets for young people have recently been updated. The International Society for Pediatric and Adolescent Diabetes now recommends an A1C of 6.5% or lower for children with access to advanced technology like continuous monitors and automated insulin pumps. In other situations, the target is 7% or lower. These goals are only appropriate when they can be reached safely, without frequent lows or a heavy burden on the child and family.
Adjusted Targets for Older Adults
Blood sugar targets loosen as health becomes more complex in older age. For older adults with significant chronic conditions or a life expectancy under ten years, a reasonable A1C target is 8% or lower, with fasting levels between 160 and 170 mg/dL. For those in poor overall health, with severe illness or cognitive decline, goals may be set even higher, with A1C up to 8.5% (equivalent to an average blood sugar around 200 mg/dL).
The logic behind these relaxed targets is straightforward: the risks of low blood sugar become more dangerous with age. A fall caused by dizziness from a low can lead to a broken hip. Confusion from hypoglycemia can be mistaken for dementia. For older adults, avoiding dangerously low readings often matters more than hitting tight targets.
When Blood Sugar Gets Dangerously Low
A reading below 70 mg/dL counts as low blood sugar, or hypoglycemia. This is classified as a Level 1 low and typically causes symptoms like shakiness, sweating, and hunger that you can treat yourself with fast-acting carbohydrates like juice or glucose tablets.
Below 54 mg/dL is a Level 2 low, which is more serious. At this point, your brain is running low on its primary fuel, and you may feel confused, have blurred vision, or struggle to think clearly. Level 3 hypoglycemia is any episode severe enough that you need someone else’s help to recover, regardless of the number on your meter. This can involve seizures or loss of consciousness.
When Blood Sugar Gets Dangerously High
On the other end, blood sugar that stays above 240 mg/dL combined with ketones in your urine signals a risk for diabetic ketoacidosis, a potentially life-threatening condition most common in Type 1 diabetes. Symptoms include nausea, vomiting, abdominal pain, and a fruity smell on the breath.
An even more extreme scenario, called hyperosmolar hyperglycemic state, involves blood sugar climbing above 600 mg/dL. This occurs more often in Type 2 diabetes, particularly in older adults, and develops gradually over days. Severe dehydration and confusion are hallmark signs. Readings above 350 mg/dL in older adults with multiple health conditions should prompt immediate action, even if symptoms seem mild. Any reading over 300 mg/dL that doesn’t respond to your usual correction plan warrants a call to your care team.