The answer to the question what is a normal blood sugar level is as follows:
Fasting normal blood sugar
Normal for person without diabetes: 70–99 mg/dl (3.9–5.5 mmol/L)
Official ADA recommendation for someone with diabetes: 80–130 mg/dl (4.4–7.2 mmol/L)
Normal blood sugar 2 hours after meals
Normal for person without diabetes: Less than 140 mg/dl (7.8 mmol/L)
Official ADA recommendation for someone with diabetes: Less than 180 mg/dl (10.0 mmol/L)
Normal for person without diabetes: Less than 5.7%
Official ADA recommendation for someone with diabetes: Less than 7.0%
Source: American Diabetes Association: Checking Your Blood Sugar, American Diabetes Association: Diagnosis
If you have diabetes, you may be wondering (or, have wondered at some point) what your blood glucose (sugar) “should” be. Hopefully your doctor, nurse practitioner, physician’s assistant or whoever diagnosed you has given you answers to that question. Unfortunately, though, not everyone is given glucose goals. Or in some cases, it may have been a long time ago, and they’ve since been forgotten. No worries — we’ll go over all that!
Blood glucose, or sugar, is sugar that is in your blood (easy enough!). It comes from the food that you eat — foods that contain carbohydrate, such as bread, pasta, and fruit are the main contributors to blood glucose. The cells in our bodies need glucose for energy — and we all need energy to move, think, learn, and breathe. The brain, which is the command center, uses about half of all the energy from glucose in the body.
When we eat food, the pancreas (an organ that sits between the stomach and the spine) goes to work, releasing enzymes that help to break down food and hormones that help the body handle the influx of glucose. One of these hormones is insulin, and it plays a key role in managing glucose levels in the blood.
And here is where things can go wrong. If the pancreas doesn’t make enough insulin — or stops making it altogether, in the case of type 1 diabetes — glucose levels in the blood can rise too high. Another scenario is that the pancreas makes enough insulin but the cells have trouble using it properly, causing blood glucose levels to rise. This is called insulin resistance and is the hallmark of type 2 diabetes.
In the short term, high blood glucose levels can make you feel downright bad. Thirst, frequent trips to the bathroom, fatigue, and weight loss are all symptoms of high blood glucose (hyperglycemia). If not treated, more serious issues can occur, such as diabetic ketoacidosis (DKA). Chronic high blood glucose levels can lead to complications such as heart, kidney and eye disease, as well as nerve damage. So, it’s all about the blood glucose.
For the most part, you can’t “feel” what your blood glucose level is — unless it’s fairly high or it’s low. You may not even always have symptoms of either high or low blood glucose; in fact, many people with type 2 diabetes don’t have the usual symptoms of high blood glucose, and for this reason, it’s not uncommon for people to go undiagnosed for many years.
The best way to know your blood glucose level is to check it with a glucose meter. This means doing a finger-stick with a lancet and getting a drop of blood onto a test strip, then inserting the strip into the meter for a reading. Your doctor may be able to give you a meter free of charge, but you’ll likely need to pay for test strips and lancets. But check with your health plan, as there are likely one or two “preferred” meters that they want you to use.
Another way to know what your glucose levels are up to is to use a continuous glucose monitor, or CGM, which reads glucose in the interstitial fluid (the fluid between cells) about every five minutes. Continuous glucose monitoring is expensive and may or may not be covered by your health plan.
Depending on your diabetes treatment plan, your doctor or diabetes educator may advise you to check once a week, once a day or up to 10 times a day (hint: if they don’t tell you, ask!). But what does it mean when you see a 67, 101, or 350 on your meter? And what is a “normal” blood sugar, anyway? Great questions! After all, if you don’t know what the numbers on your meter mean, it’s hard to know how you’re doing.
(Here’s where the term “normal” comes in. According to the Merriam-Webster dictionary, one definition of normal is “conforming to a type, standard, or regular pattern.” It’s a term that not everyone takes kindly to, because if you’re not “normal,” you might be considered “abnormal,” which means, “unusual in an unwelcome or problematic way.” Rather than thinking of your blood sugars as being normal or abnormal, you might think of them as being “in range,” “in target” or “at goal.”)
The American Diabetes Association (ADA) provides guidelines (not mandates) for blood glucose goals for people with diabetes, and the goals vary depending on when you’re checking your glucose:
• Fasting (before eating the first meal of the day) and before meals: 80–130 mg/dl (4.4–7.2 mmol/L)
• Postprandial (one to two hours after a meal): Less than 180 mg/dl (10.0 mmol/L)
By the way, these guidelines are for non-pregnant adults with type 1 or type 2 diabetes. Children, adolescents and pregnant women may have different goals.
Your blood glucose goals may be different, however. If you’re younger, have had diabetes for a shorter amount of time, or are not taking any medicine for your diabetes, your glucose goals might be a little “tighter,” or lower. Likewise, your blood glucose goals may be higher than what ADA recommends if you’re older, have diabetes complications, or don’t get symptoms when your blood glucose is low.
Bottom line: talk with your health care provider about the following:
• When to check your blood glucose
• How often to check your blood glucose
• What your blood glucose goals are (don’t forget to ask about your A1C goal, as well)
Consider keeping a log of your glucose levels. You can use good old-fashioned pencil and paper, a spreadsheet, a logbook, or a smartphone app to track your levels. If you’re not inclined to do this, your meter will capture up to a certain number of glucose values and let you download them to a computer for your viewing pleasure.
It’s important to look at all of your glucose values to get the big picture — not just a single point in time. By doing so, you can spot trends (for example, your fasting blood glucose levels are consistently above target or you tend to go low every afternoon around 4 p.m.). Your numbers are information for both you and your health care team to learn how your diabetes treatment plan (medication, food intake, physical activity) are working for you. Bring your logs or, at least, your meter to all of your regular provider visits and make sure your provider looks at your numbers.
Remember: If your blood glucose levels aren’t at goal, ask your provider or diabetes educator what you can do to tweak your diabetes treatment plan. Not every blood sugar that you check needs to be at target, but the closer you keep them within your target range, the lower the chance of complications. And the more often you check your blood glucose, the more information you have at your fingertips (literally) to do a course correction, if needed.
Learn blood sugar basics with our free guide!
Interested in learning more about blood sugar? Check out our blood sugar chart and learn about using blood sugar monitoring to manage diabetes in “Managing Your Blood Glucose Ups and Downs.”
En Español: ¿Qué es Un Nivel Normal de Azúcar en Sangre?
Source URL: https://www.diabetesselfmanagement.com/blog/what-is-a-normal-blood-sugar-level/
Amy Campbell: Amy Campbell is the author of Staying Healthy with Diabetes: Nutrition and Meal Planning and a frequent contributor to Diabetes Self-Management and Diabetes & You. She has co-authored several books, including the The Joslin Guide to Diabetes and the American Diabetes Association’s 16 Myths of a “Diabetic Diet,” for which she received a Will Solimene Award of Excellence in Medical Communication and a National Health Information Award in 2000. Amy also developed menus for Fit Not Fat at Forty Plus and co-authored Eat Carbs, Lose Weight with fitness expert Denise Austin. Amy earned a bachelor’s degree in nutrition from Simmons College and a master’s degree in nutrition education from Boston University. In addition to being a Registered Dietitian, she is a Certified Diabetes Educator and a member of the American Dietetic Association, the American Diabetes Association, and the American Association of Diabetes Educators. Amy was formerly a Diabetes and Nutrition Educator at Joslin Diabetes Center, where she was responsible for the development, implementation, and evaluation of disease management programs, including clinical guideline and educational material development, and the development, testing, and implementation of disease management applications. She is currently the Director of Clinical Education Content Development and Training at Good Measures. Amy has developed and conducted training sessions for various disease and case management programs and is a frequent presenter at disease management events.
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