What Level of Blood Sugar Is Dangerous in Canada?

Maintaining a healthy blood sugar level is not only important for individuals with diabetes but for everyone’s overall well-being. In Canada, where over 11 million people are living with diabetes or prediabetes, understanding what level of blood sugar is considered dangerous is crucial. Whether you are personally affected by diabetes or simply curious about the risks associated with fluctuating blood sugar levels, this article will delve into the specific guidelines and thresholds set in Canada. By gaining a better understanding of blood sugar regulation, we can all take steps towards optimal health and wellness. So, let’s explore what level of blood sugar is dangerous in Canada and why it matters.

Understanding Blood Sugar Levels: An Overview

Blood glucose, also known as blood sugar, is a crucial energy source derived mostly from the food we consume. Maintaining normal blood sugar levels is essential for overall health, particularly in managing diabetes. In Canada, blood sugar levels are measured in mmol/L (millimoles per liter), and understanding these measurements helps in effective diabetes management. For reference, a person without diabetes usually has a blood sugar level between 3.5 mmol/L and 7.8 mmol/L. However, diabetes is diagnosed when blood sugar is greater than 11 mmol/L.

normal blood sugar levels

1. What is Blood Glucose?

Blood glucose is the sugar present in your bloodstream that comes primarily from the carbohydrates in your diet. It is a vital energy source for your body’s cells but requires delicate balance. Factors such as food intake, physical activity, and insulin doses significantly influence blood glucose levels. For instance, blood sugar levels for children with type 1 diabetes vary by age group, from 6 to 10 mmol/L for children younger than six years, 4 to 10 mmol/L for those aged 6 to 12 years, and 4 to 7 mmol/L for teenagers. Keeping these targets helps prevent complications from either low or high blood glucose.

2. Role of Insulin in Blood Sugar Management

Insulin, a hormone produced by the pancreas, plays a vital role in managing blood glucose. It allows glucose to enter cells to be used for energy. Without sufficient insulin function, blood sugar levels can become dangerously high. People with type 1 diabetes require external insulin administration because their pancreas does not produce the hormone. Proper insulin function is necessary to maintain normal blood sugar levels and prevent the development of diabetes-related complications. Insulin facilitates the uptake of glucose, ensuring cells get the energy they need while avoiding high blood sugar levels, which can lead to severe health issues.

Furthermore, consistency in routine, effective communication between home and school, and vigilant monitoring are crucial for managing blood sugar levels in children and youth with diabetes. Blood sugar readings are not “good” or “bad”; they are simply indicators that guide necessary actions to maintain normal blood sugar levels.

What Level of Blood Sugar Is Dangerous in Canada?

Understanding the dangerous thresholds of blood sugar levels is crucial for managing diabetes effectively and maintaining overall health. This section delves into the specifics of low and high blood sugar levels, providing insights into hypoglycemia and hyperglycemia.

1. Low Blood Sugar (Hypoglycemia)

Hypoglycemia occurs when blood sugar levels drop below 4 mmol/L. Severe cases, characterized by levels less than 2.8 mmol/L, can lead to confusion, loss of consciousness, and seizures. Common causes include increased physical activity, delayed meals, excessive medication intake, and alcohol consumption.

Maintaining a proper blood sugar range is essential. Rapidly acting carbohydrates like glucose tablets, sugar dissolved in water, juice, or soft drinks can be used to treat hypoglycemia. After ingestion, it is recommended to wait 15 minutes and re-check the blood sugar levels to ensure they rise above 4 mmol/L. Repeat the treatment cycle if necessary.

high blood sugar levels

2. High Blood Sugar (Hyperglycemia)

Hyperglycemia refers to high blood sugar levels exceeding 11 mmol/L in a diabetic person. When untreated, hyperglycemia can result in severe health complications, including nerve damage, cardiovascular problems, and kidney disease.

Hyperglycemia symptoms often include frequent urination, increased thirst, and blurred vision. It is vital for individuals with diabetes to frequently monitor their blood sugar range, maintaining levels within the target range specified by healthcare providers. For most adults with type 1 or type 2 diabetes, an A1c of 7.0% or less is suggested.

Blood Sugar Level (mg/dL) Classification Implications
Below 70 Low Blood Sugar (Hypoglycemia) Can lead to fainting and seizures if severe
70-99 Normal (Fasting) Healthy blood sugar range
100-125 Prediabetes (Fasting) Increased risk of developing diabetes
126 or higher Diabetes (Fasting) Diagnosis of diabetes
140 or lower Normal (Non-fasting) Healthy blood sugar range
140-199 Prediabetes (Non-fasting) Increased risk of developing diabetes
200 or higher Diabetes (Non-fasting) Diagnosis of diabetes
240 or higher High Blood Sugar (Hyperglycemia) Increased risk of serious health issues

Managing blood sugar requires a meticulous approach tailored to the individual’s medical needs. For children and youth, or women with gestational diabetes, specific targets are important to mitigate risks and promote health during different life stages.

Signs and Symptoms of Dangerous Blood Sugar Levels

Recognizing the signs of high blood sugar levels and low blood sugar is crucial for effective blood sugar control and preventing severe health complications. Let’s delve into the specific symptoms of these conditions.

1. Symptoms of Low Blood Sugar

Low blood sugar, known as hypoglycemia, occurs when blood sugar levels drop below 70 mg/dL. This condition can manifest through various physical and cognitive symptoms, including:

  • Shakiness
  • Sweating
  • Hunger
  • Confusion
  • Inability to concentrate

Severe low blood sugar, or hypoglycemia, can potentially lead to unconsciousness, seizures, and other life-threatening issues if not promptly addressed.

2. Symptoms of High Blood Sugar

High blood sugar levels, or hyperglycemia, generally occur when blood sugar levels exceed 240 mg/dL. People may not experience symptoms until levels reach 250 mg/dL or higher, which highlights the importance of regular monitoring. Symptoms of hyperglycemia include:

  • Increased thirst
  • Frequent urination
  • Difficulty concentrating
  • Blurred vision
  • Fatigue

High blood sugar levels left untreated can lead to serious complications, such as diabetic ketoacidosis, and potentially result in coma or even death.

high blood sugar levels

Understanding and monitoring these signs of diabetes is essential for effective blood sugar control. Here is a comparative table highlighting normal, prediabetic, and diabetic ranges for blood sugar levels:

Condition Fasting Blood Sugar Levels (mg/dL) Non-Fasting Blood Sugar Levels (mg/dL)
Normal 99 or lower 140 or lower
Prediabetes 100 to 125 140 to 199
Diabetes 126 or higher 200 or higher

By recognizing these symptoms and regularly monitoring blood sugar levels, individuals can maintain better blood sugar control and reduce the risk of dangerous complications.

Causes of Dangerous Blood Sugar Levels

Understanding the causes behind dangerous blood sugar levels is crucial for effective blood sugar management and mitigating diabetes health risks. Both low and high blood sugar levels can be triggered by various factors, making comprehensive knowledge essential for those managing diabetes in Canada.

1. Causes of Low Blood Sugar

Low blood sugar, or hypoglycemia, can occur due to several factors including insufficient food intake, skipping meals, excessive physical activity, and overmedication. Certain medications that lower blood sugar can also precipitate hypoglycemia. For instance, excessive exercise without adequate nutrition or alcohol intake can lead to significant drops in blood glucose levels.

blood sugar management

  • Insufficient food intake
  • Skipping meals
  • Excessive physical activity
  • Overmedication
  • Alcohol consumption

2. Causes of High Blood Sugar

High blood sugar, or hyperglycemia, might result from factors such as missing medication doses, eating too many calories, physical inactivity, infections, or illness. Stress, injury, or surgery can also elevate blood sugar levels. Effective blood sugar management involves careful monitoring and appropriate interventions.

  • Missing medication doses
  • Eating too many calories
  • Physical inactivity
  • Infections or illness
  • Stress, injury, or surgery

Prolonged high blood sugar can lead to serious complications such as ketoacidosis, which is a medical emergency, and requires immediate intervention to prevent further diabetes health risks. Managing these causes effectively is paramount for maintaining healthy blood glucose levels and overall well-being.

Treating Dangerous Blood Sugar Levels

Managing dangerous blood sugar levels is critical to maintaining overall health and preventing complications. Both low and high blood sugar levels require prompt and appropriate interventions. Below, we outline the treatments commonly recommended for both conditions, ensuring a comprehensive understanding of individualized treatment plans.

1. Treatment for Low Blood Sugar

Treating low blood sugar involves the immediate consumption of fast-acting carbohydrates. This can include glucose tablets, fruit juice, or regular soda. Once blood sugar levels begin to normalize, it is advisable to re-evaluate and potentially consume additional carbohydrates coupled with a protein source to maintain stable levels. Continuous blood sugar monitoring is essential to assess the effectiveness of these interventions and make necessary adjustments.

2. Treatment for High Blood Sugar

Treating high blood sugar often involves administering insulin. An effective insulin treatment plan might require adjustments to dietary habits and physical activity levels. Individuals must work with healthcare providers to create a personalized plan that addresses their unique needs. Additionally, continuous blood sugar monitoring can help to track and manage blood glucose levels, making it easier to identify trends and act swiftly in case of hyperglycemia.

Understanding and promptly treating both low and high blood sugar levels can significantly improve quality of life and help in achieving recommended blood glucose targets.

Blood Glucose Level (mg/dL) Condition Recommended Action
Below 70 Hypoglycemia Consume fast-acting carbs, re-evaluate, eat carbs with protein if needed
70-180 Normal Range Maintain through balanced diet and regular monitoring
Above 180 Hyperglycemia Administer insulin, adjust diet and activity, monitor levels

How to Monitor and Maintain Healthy Blood Sugar Levels?

Effectively managing diabetes begins with regular monitoring of your blood sugar levels. Utilizing blood sugar monitoring devices such as glucose meters or continuous glucose monitors (CGMs) can keep you informed and within target ranges, enabling adjustments in lifestyle and medication as necessary.

Frequent monitoring with these blood sugar monitoring devices is imperative for maintaining blood sugar levels. These devices provide real-time insights, facilitating better management of diabetes and helping to prevent complications like kidney disease and vision loss, as noted by the U.S. Centers for Disease Control and Prevention (CDC).

According to Diabetes Canada, one in three Canadians are living with diabetes or prediabetes. This highlights the crucial need for effective monitoring practices. Whether you are newly diagnosed or have been managing diabetes for years, continuous assessment of blood glucose levels is essential for optimal health.

Healthcare providers play an integral role in guiding you on how to use your blood sugar monitoring devices effectively. They offer personalized advice, helping you make necessary adjustments in diet, physical activity, and medication to ensure you are maintaining healthy blood sugar levels.

Several factors can impact blood sugar levels, including physical activity, diet, sleep, and stress. The American Diabetes Association suggests aiming for 150 minutes of moderate to vigorous physical activity per week to aid in managing blood sugar levels. Additionally, breaking down sedentary time with smaller bouts of exercise, such as taking 250 steps per hour, can be beneficial.

Regular check-ups with healthcare providers are crucial. Dr. Kaberi Dasgupta advises that most individuals should get their first blood sugar test around the age of 40. Regular testing coupled with a healthy lifestyle can make a significant difference in managing diabetes efficiently.

Recognizing the importance of blood sugar monitoring devices and maintaining blood sugar levels through consistent observation and lifestyle modification is pivotal. By doing so, you are proactively managing diabetes and improving overall health outcomes.


Understanding what level of blood sugar is dangerous is a cornerstone of effective diabetes management in Canada. For those without diabetes, normal blood sugar levels range from 70–99 mg/dl (3.9–5.5 mmol/L) and should not exceed 140 mg/dl (7.8 mmol/L) after meals. In contrast, individuals with diabetes should aim to maintain their blood sugar between 80–130 mg/dl (4.4–7.2 mmol/L) and below 180 mg/dl (10.0 mmol/L) postprandially, as recommended by the American Diabetes Association (ADA). Maintaining a Hemoglobin A1c level of less than 7.0% is crucial for preventing high blood sugar complications.

High blood sugar levels for extended periods can cause significant damage to vital organs, including the kidneys, blood vessels, eyes, and nerves, increasing the risk of severe conditions like diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemic state (HHS). Conversely, hypoglycemia, often resulting from excessive insulin or diabetic medications, can lead to various concerning symptoms. Recognizing and managing these extremes is vital for those living with diabetes to avoid life-threatening complications.

Effective diabetes management involves a comprehensive approach: immediate treatment during episodes of hypo- or hyperglycemia, consistent monitoring, and adopting preventive measures like a fiber-rich diet. Pregnant women with gestational diabetes and critically ill patients need to pay special attention to glucose control to mitigate risks. With over ten million Canadians living with diabetes or prediabetes, it’s crucial to employ these strategies to ensure a healthy and active life.


1. What is considered a dangerous blood sugar level in Canada?

Hypoglycemia occurs when blood sugar drops below 4 mmol/L, and it is deemed severe if it falls below 2.8 mmol/L. Hyperglycemia is considered dangerous when blood sugar exceeds 11 mmol/L in individuals with diabetes.

2. What is blood glucose?

Blood glucose, also known as blood sugar, is an energy source derived primarily from food. It plays a crucial role in providing energy for the body’s cells and functions.

3. What role does insulin play in blood sugar management?

Insulin, a hormone produced by the pancreas, helps manage blood sugar levels by allowing glucose to enter cells for energy. In conditions like type 1 diabetes, the pancreas does not produce insulin, necessitating external administration and careful monitoring.

4. What are the symptoms of low blood sugar?

Symptoms of low blood sugar, or hypoglycemia, include shakiness, sweating, hunger, confusion, increased heart rate, and in severe cases, loss of consciousness or seizures.

5. What are the symptoms of high blood sugar?

Symptoms of high blood sugar, or hyperglycemia, include increased thirst, frequent urination, and difficulty concentrating. It requires prompt attention to prevent severe complications.

6. What causes low blood sugar levels?

Low blood sugar can result from excessive physical activity, delayed or inadequate nutrition, excessive medication, or alcohol consumption. These factors necessitate careful blood sugar management to maintain healthy levels.

7. What causes high blood sugar levels?

High blood sugar can stem from insufficient insulin, dietary choices, physical inactivity, illness, or stress. Managing these factors is essential in maintaining safe blood sugar levels.

Leave a Reply

Your email address will not be published. Required fields are marked *