Blood Sugar Levels: Normal Ranges for Men and Women

What does blood sugar mean?
Determining normal blood sugar levels
Comparative analysis of blood glucose levels in men and women
Methods for diagnosing blood glucose levels: necessary tests
Effective use of a glucometer to monitor blood sugar levels
8 unexpected reasons that contribute to the rise in blood glucose levels
What to do if your blood sugar is low?

Dream of working remotely? ➞ Study IT, design, or marketing. Get started with five online courses to immerse yourself in in-demand digital professions.

Learn more

In this article, you will learn about:

Blood sugar levels are an important indicator of a person's health. They can provide valuable information about metabolic function, especially the work of insulin, the hormone responsible for regulating glucose levels. Measuring blood sugar helps identify various conditions, such as prediabetes, type 1 and type 2 diabetes, and hypoglycemia, a condition in which glucose levels are too low.
Furthermore, fluctuations in sugar levels can indicate problems with the pancreas or other organs involved in metabolism. Regular monitoring of glucose levels is especially important for people with diabetes, as it allows for control of the condition and the prevention of complications. It's important to remember that blood sugar levels can be affected by a variety of factors, including diet, physical activity, stress, and even the time of day. Therefore, a comprehensive approach to analyzing this data will help create a complete picture of your health and promptly take appropriate action.
What blood sugar level is considered normal?
Several types of tests are typically used to assess blood glucose levels. The most common is a plasma glucose test, which can be performed either fasting or after a meal. A glycated hemoglobin test, which shows your average blood sugar level over the past three months, is also often prescribed. A glucose tolerance test, which involves giving the patient a glucose solution to drink and then measuring their blood sugar at regular intervals, can also be helpful. All of these tests help doctors get a complete picture of your carbohydrate metabolism and identify any potential problems.
Using a glucometer at home is an important process that helps manage your blood sugar levels. Here are a few steps to help you use this device correctly.
First, you need to prepare all the necessary materials. Make sure you have the meter itself, test strips, and lancets. Don't forget the alcohol solution for disinfection.
Before testing, wash your hands with soap and dry them thoroughly. This will help avoid contamination and ensure a more accurate result. Then, take the lancet and prick the side of your finger to obtain a drop of blood.
Now attach the test strip to the meter and wait until the device is ready for testing. Hold the drop of blood to the strip—depending on the meter model, the strip may absorb the blood automatically.
Once the test is complete, the result will appear on the device screen. Record it in a diary or monitoring app to track changes in your sugar levels.
Remember to regularly check the expiration dates of your test strips and follow the manufacturer's instructions for maintaining your glucometer. This will help maintain the accuracy of your readings and extend the life of the device.
Besides sugary foods, there are many factors and foods that can contribute to high blood glucose levels. For example, carbohydrates found in bread, pasta, and rice also have a significant impact on sugar levels. Additionally, some fruits, especially those with a high glycemic index, can quickly raise glucose levels when consumed.
Finally, it's worth considering that stress, lack of physical activity, and certain medical conditions can also lead to high blood sugar. Therefore, it's important to monitor your overall lifestyle and diet to manage your glucose levels.
If your blood sugar levels are below the normal range, it's important to take a number of steps to correct them. First of all, it is recommended to immediately consult a healthcare professional to determine the cause of hypoglycemia and receive appropriate recommendations.
If a sudden drop in blood sugar occurs, you can try to quickly raise it by consuming foods containing simple carbohydrates. These could include, for example, juice, a sweet treat, or glucose tablets. For a more lasting effect, it is worth supplementing your diet with foods with slow-release carbohydrates, such as bread, cereals, or fruit.
Equally important is monitoring your health, including regularly measuring your blood sugar levels, especially if you have a predisposition to diabetes or other endocrine disorders. Keeping a food and exercise diary can help identify factors contributing to glucose fluctuations.
It is also recommended to avoid excessive physical activity, especially on an empty stomach, and monitor your diet – regular meals will help maintain stable blood sugar levels. If low glucose levels become a frequent occurrence, this may require a review of your medication or lifestyle, which should also be discussed with your doctor.

What does blood sugar mean?

Biochemically, sugars are a variety of chemical substances classified as carbohydrates. However, when doctors mention the term "sugar," they are typically talking about the concentration of glucose in the blood or urine.

Glucose is a type of sugar that serves as a simple and easily digestible source of energy for the body, particularly for organs such as the heart, muscles, and brain.

Both too much and too little glucose can negatively affect the body.

Hypoglycemia is a condition characterized by low blood sugar levels. Without glucose, the brain, as well as muscles, including the heart, begin to function abnormally, allowing symptoms of this condition to be felt almost immediately after its onset.
Hyperglycemia is a condition in which blood glucose levels rise. This process typically leads to slow destruction of the body, and its effects may go unnoticed until serious complications occur. In most cases, elevated blood sugar can only be detected through testing.

Defining Normal Blood Sugar Levels

You've probably noticed the variety of normal values presented in lab tests. First, you'll notice that the measurements are presented in different units: some use mmol/L, while others use mg/dL. Second, the "normal" values themselves also vary. Let's take a closer look at this issue.

Both units of measurement used, mmol/L and mg/dL, have their own validity. In this case, we can't say that one is "correct" and the other is "outdated." They simply represent blood glucose levels in different ways.

mg/dL stands for milligrams per deciliter, which indicates the amount of glucose in 100 ml of blood. This unit is most commonly used in countries such as the United States, Japan, France, Egypt, and Colombia. The American Diabetes Association also uses mg/dL in its guidelines.
mmol/L stands for millimoles per liter. This unit reflects the number of glucose molecules in a given volume of fluid. This measurement method is used in the United Kingdom, Canada, Australia, and many other countries around the world.

The World Health Organization and the Russian Ministry of Health use the mmol/L unit. If your test was performed in this unit and you need to convert the value to mg/dL, simply multiply the resulting number by 18.02.

Let's move on to the numbers themselves.

To correctly interpret your glucose test results, it is important to consider the type of blood used as the sample. Results obtained from capillary blood (from a finger prick) and venous blood will differ. The difference in glucose concentration can reach 10-15% [8].

The fingertip contains capillary blood, which may contain a small amount of tissue fluid, lymph, and fragments of dead cells. In turn, venous blood contains a larger amount of liquid.

According to the World Health Organization, blood glucose levels are considered normal [7]:

However, if you pay attention to the information provided by the American Diabetes Association, you will notice that it indicates sugar levels in the range from 5.0 to 7.2 mmol / L. This range is a target mark - a conditional and adaptive norm that people with diabetes should strive for.

Comparative analysis of blood glucose levels in men and women

No. An exception is made for pregnant women, who may experience gestational diabetes. This is a temporary metabolic disorder that typically resolves after birth, but requires medical supervision and proper diet.

Blood Glucose Diagnostic Methods: Necessary Tests

A number of tests are performed to assess blood sugar levels.

This test allows you to determine the amount of glucose in the blood after an overnight fast, which should be at least 8 hours. It is most often performed in the morning, immediately after waking up, which corresponds to a night's rest of 7-8 hours.

However, this analysis does not always provide complete information, as it can show values within the normal range, even in patients with type 2 diabetes.

Type 2 diabetes has its own characteristics compared to type 1 diabetes: in the case of type 2, the body has a sufficient amount of insulin, and sometimes even an excess. However, the main problem is that cells lose their sensitivity to this hormone. Without insulin, the GLUT4 transporter, which is responsible for transporting glucose to muscle and fat tissue, does not function. As a result, a significant portion of glucose remains in the bloodstream.

The glucose tolerance test is used to assess the rate at which blood glucose levels are restored to normal values after a meal. This test is also known as a stress test. Its main purpose is to detect prediabetes, a condition bordering on normal levels and diabetes. In prediabetes, test results indicate impaired glucose tolerance.

Glucose tolerance is the body's ability to adequately respond to glucose. Once glucose enters the bloodstream, its concentration rises rapidly. However, after approximately two hours, glucose levels return to baseline, which can be recorded in a fasting blood test. Normal tolerance levels indicate that the pancreas produces sufficient insulin, which effectively transports glucose to the liver, muscle, and adipose tissue.

Surprisingly, glucose is transported in neurons by GLUT1, which is independent of insulin. This means that even when insulin levels are low or if cells lose sensitivity to it, the brain still receives the glucose it needs.

The glucose tolerance test is performed as follows [7]:

The blood test requires the patient to be fasting.
The patient is asked to drink a solution containing glucose.
Repeat blood tests are performed after 30, 60, 90, or 120 minutes.

The test has the following interpretation:

This test does not measure the level of sugar in the blood, but the amount of glucose bound to the protein hemoglobin. Hemoglobin is a component of red blood cells, known as erythrocytes, which have a lifespan of about 120 days. If during this time the blood glucose level was elevated and remained high, resulting in the formation of glycated hemoglobin. No preliminary preparation is required for this analysis.

Type 2 diabetes mellitus differs from type 1 diabetes in that in the case of type 2, the body produces enough insulin, and sometimes even in excess. However, the main problem is that the cells lose their sensitivity to this hormone. Without insulin, the GLUT4 transporter, which is responsible for transporting glucose to muscle and adipose tissue, does not function. As a result, a significant amount of glucose remains in the blood.

Effective use of a glucometer to monitor blood sugar levels

To independently monitor blood glucose levels, you can use a compact device - a glucometer. There are many models of such devices on the market, but they all function in the same way. Glucometers are equipped with a lancet for puncturing the skin and a special compartment for test strips.

Correct use of a glucometer involves several important steps that will help you achieve accurate blood sugar results.

First, make sure the device and all its components are clean and in good working order. Before starting the test, wash your hands thoroughly with soap and dry them to avoid transferring foreign substances to the test strip.

After preparation, take the glucometer and insert a new test strip into it, following the manufacturer's instructions. Make sure the strip is correctly positioned, as this is critical for accurate readings.

Next, you need to prepare your finger for the prick. It is usually recommended to use the sides of the finger, as this is less painful. Use the lancet to make a small prick and gently squeeze your finger to obtain a drop of blood.

Touch the drop of blood to the test strip. It's important that the blood completely fills the hole on the tape, otherwise the results may be inaccurate. After this, wait for the glucometer to process the data and display the result.

Record the readings to track changes in your blood sugar levels. This will help you better manage your condition and, if necessary, contact your doctor to adjust your treatment.

Remember to regularly check the expiration date of the test strips and monitor the calibration of your glucometer to ensure accurate measurements.

Clean your hands thoroughly.
Remove one test strip from the package and carefully insert it into the glucometer.
Massage the finger where you plan to perform the test to increase blood circulation in this area.
Prick your finger with a lancet, then squeeze a small amount of blood onto the test strip or simply touch the edge of the strip to the drop of blood.

After a few seconds, the glucometer will provide the results.

Use the glucometer to monitor your blood sugar levels both before meals and 1-2 hours after eating. Record the data you receive in a special app on your phone or on paper so you can show it to your doctor during your consultation.

8 Unexpected Causes of High Blood Glucose

Blood glucose levels can fluctuate greatly. This is not due to a faulty glucometer; do not shake or replace it. Blood sugar levels are variable. In most cases, glucose levels will increase in response to various actions. However, for healthy people, this indicator quickly returns to normal.

Factors that can increase blood sugar levels include:

Among artificial sweeteners, sucralose is of particular interest. This low-calorie sugar substitute can activate receptors responsible for the perception of sweet taste in the intestines, which, in turn, plays a role in regulating insulin production.
Sunburns occur for a fairly simple reason: even minor damage to the skin leads to painful sensations, which, in turn, is stress for the body. This stress activates the release of adrenaline and cortisol, which causes the liver to increase blood glucose levels.
Coffee. Occasionally, caffeine can slightly increase blood glucose levels, but with prolonged use, it, on the contrary, helps to decrease them.
Lack of sleep can negatively affect metabolism, and even one night without sleep can lead to a decrease in the efficiency of glucose absorption by the body.
In the morning hours, regardless of the presence of diabetes, people experience hormonal activation. As a result of this process, blood glucose levels increase, which has become known as the "dawn phenomenon."
Dehydration. As the volume of fluid in the blood decreases, the concentration of glucose dissolved in it increases.
Nasal sprays. Certain active substances contained in such sprays can stimulate the liver to increase the production of glucose in the bloodstream.
Skipping breakfast can cause blood sugar levels to rise significantly after lunch.

What should I do if my blood sugar is low?

There is a common misconception that hypoglycemia is observed exclusively in patients with diabetes and occurs only as a result of an incorrectly selected insulin dose.

However, blood sugar levels can also drop for other reasons, one of which is alcohol consumption.

Funnily enough, sometimes a person may not have any symptoms of this condition if the body quickly normalizes glucose levels using reserves from the liver. However, there are also the following complaints [19]:

irritability;
problems with concentration.
rapid pulse;
fatigue;
headache;
sweating;
tingling or loss of sensation in the upper and lower extremities;
vision problems.

The dangers of low blood sugar can be serious, but there are ways to manage them. If glucose levels drop below the target, it is recommended to use the "15-15 rule": consume 15 grams of carbohydrates that are low in fiber and fat. This should be repeated every 15 minutes until the sugar level is normal.

What product can be used to quickly increase blood sugar levels?

Half a glass of juice or plain soda without dietary additives.
One tablespoon of sugar, honey, or syrup.
chewable sweets, gummies, or dragees.

Sources

Berg, J. M., Tymoczko, J. L., Gatto, G. J., Jr., & Stryer, L. (2015). Biochemistry. W. H. Freeman.

Hyperglycemia (High Blood Glucose). American Diabetes Association.

3. Low Blood Sugar (Hypoglycemia). National Institutes of Health.

Mathew T. K., Zubair M., Tadi P. Blood Glucose Monitoring. [Updated April 23, 2023]. In: StatPearls [Internet]. Treasure Island, FL: StatPearls Publishing; Accessed January 2025.

5. Blood Glucose Monitoring. Diabetes Testing and Monitoring. American Diabetes Association.

6. Mean Fasting Blood Glucose. World Health Organization.

7. Type 2 Diabetes in Adults. Clinical Practice Guidelines. 2022.

Expand list

Blood Glucose Measurement: The Challenge of Sample and Method Inconsistency. AcuteCareTesting.org.

Olkhovik A. Y., Sadovnikov P. S., Vasiliev A. V., Denisov D. G., and Emanuel V. L. conducted a study comparing biochemical parameters of blood obtained by capillary and venous sampling. The results were published in the journal "Laboratory Service" in 2018, in issue 7, number 2, page 5. DOI: 10.17116/labs2018725-11.

ElSayed N. A., Aleppo G., Bannuru R. R., Bruemmer D., Collins B. S., Ekhlaspour L., Gaglia J. L., Hilliard M. E., Johnson E. L., Khunti K., Lingvay I., Matfin G., McCoy R. G., Perry M. L., Pilla S. J., Polsky S., Prahalad P., Pratley R. E., Segal A. R., and other authors. 2. Diagnosis and classification of diabetes: Standards of care for diabetes - 2024. Diabetes Care. 2023. 47 (Addendum_1). S20–S42. DOI: 10.2337/dc24-s002.

Hantzidiamantis P. J., Awosika A. O., and Lappin S. L. presented material on the physiology and role of glucose in 2024, published in StatPearls on the NCBI Bookshelf platform.

Classification and diagnosis of diabetes. Diabetes Care. 2015. 39(Supplement_1). S13–S22. DOI: 10.2337/dc16-s005.

Koepsell H. Glucose transport in the brain: health and disease. Pflügers Archiv — European Journal of Physiology. 2020. 472(9). 1299–1343. DOI: 10.1007/s00424-020-02441-x.

Saudek, C. D., and Brick, J. C. (2009). Clinical applications of hemoglobin A1C. Journal of Diabetes Science and Technology, 3(4), 629–634. DOI: 10.1177/193229680900300402.

15. Blood Sugar Testing: Why, When, and How. MayoClinic.

Pepino, M. Y., Thiemann, S. D., Patterson, B. W., Weiss, B. M., and Klein, S. conducted a study in which they examined the effects of sucralose on glucose levels and hormonal responses after oral glucose administration. Their findings were published in Diabetes Care in 2013, issue 36, number 9, pages 2530–2535. DOI: 10.2337/dc12-2221.

17. Ten Surprising Factors That Can Raise Blood Sugar. Centers for Disease Control and Prevention (CDC).

Reis, K. E., Dorey, J. G., and da Costa, T. H. The Effect of Coffee Consumption on Glucose Metabolism: A Systematic Review of Clinical Trials. Journal of Traditional and Complementary Medicine. 2018. 9(3). 184–191. DOI: 10.1016/j.jtcme.2018.01.001.

19. Low Blood Sugar. MedlinePlus.

20. Approaches to Treating Hypoglycemia (Low Blood Sugar). CDC.

The 15/15 Rule. MedlinePlus.

Blood sugar levels: norms for men and women

Contents: