Your Blood Sugar Level Chart: Decoding Normal, Low, and High Readings

30 Aug 2025

Your Blood Sugar Level Chart: Decoding Normal, Low, and High Readings Related reading: How To Read A Blood Glucose Bg Meter Accurately Every TimeUnder...

Your Blood Sugar Level Chart: Decoding Normal, Low, and High Readings

Related reading: How To Read A Blood Glucose Bg Meter Accurately Every Time

Understanding your blood sugar levels is crucial for managing your health, especially if you have diabetes or are at risk of developing it. Blood sugar, or glucose, is the main sugar found in your blood and comes from the food you eat. It's your body's primary source of energy. A blood sugar level chart can help you monitor whether your levels are within the healthy range. This article provides a comprehensive guide to decoding normal, low, and high blood sugar readings, empowering you to take control of your well-being.

Understanding Blood Sugar and Its Importance

Blood sugar levels fluctuate throughout the day based on various factors, including what you eat, your activity level, and any medications you're taking. Maintaining stable blood sugar is important because chronically high or low levels can lead to serious health complications.

Related reading: How To Lower Your A1C Blood Sugar 10 Proven Strategies

  • High blood sugar (hyperglycemia): Can damage blood vessels, nerves, and organs over time, increasing the risk of heart disease, kidney disease, nerve damage (neuropathy), and eye damage (retinopathy).
  • Low blood sugar (hypoglycemia): Can cause symptoms like shakiness, confusion, and even loss of consciousness if left untreated.

Regular monitoring using a blood sugar level chart enables individuals to make informed decisions about their diet, exercise, and medication, helping them maintain optimal health and prevent long-term complications.

Normal Blood Sugar Level Chart for Adults

Here's a general blood sugar level chart for adults without diabetes. Note that these are general guidelines, and your healthcare provider may recommend different target ranges based on your individual health needs.

| Time of Day | Normal Range (mg/dL) | | ---------------------------- | ---------------------- | | Fasting (upon waking) | 70-99 | | Before a meal | 70-99 | | 1-2 hours after a meal | Less than 140 |

Related reading: The Relationship Between Your A1C Test And Daily Blood Sugar Readings

Key Takeaways:

  • Fasting blood sugar: Measured after at least eight hours of not eating. This is a common test to screen for diabetes.
  • Postprandial (after-meal) blood sugar: Measures how your body processes sugar after eating.

Blood Sugar Level Chart for People with Diabetes

For individuals diagnosed with diabetes, target blood sugar levels are often different than those for people without diabetes. Here's a typical blood sugar level chart for people with diabetes:

| Time of Day | Target Range (mg/dL) | | ---------------------------- | ---------------------- | | Fasting (upon waking) | 80-130 | | Before a meal | 80-130 | | 1-2 hours after a meal | Less than 180 | | HbA1c (3-month average) | Less than 7% |

Understanding HbA1c:

The HbA1c test provides an average of your blood sugar levels over the past 2-3 months. It's a crucial measure for managing diabetes effectively and assesses long-term glycemic control. The higher your HbA1c level, the greater your risk of developing diabetes-related complications.

Hypoglycemia (Low Blood Sugar): Symptoms and Treatment

Hypoglycemia occurs when your blood sugar level drops too low, typically below 70 mg/dL.

Common Symptoms:

  • Shakiness or tremors
  • Sweating
  • Dizziness or lightheadedness
  • Confusion or difficulty concentrating
  • Irritability or anxiety
  • Rapid heartbeat
  • Blurred vision
  • Headache

Immediate Treatment (Rule of 15):

  1. Check your blood sugar: Confirm that it's below 70 mg/dL.
  2. Consume 15 grams of fast-acting carbohydrates: Examples include:
    • 4 ounces of juice or regular soda (not diet)
    • Glucose tablets (follow package instructions)
    • 1 tablespoon of honey or sugar
  3. Wait 15 minutes: Recheck your blood sugar.
  4. Repeat if necessary: If your blood sugar is still below 70 mg/dL, repeat steps 2 and 3.
  5. Eat a meal or snack: Once your blood sugar is above 70 mg/dL, eat a meal or snack containing complex carbohydrates and protein to stabilize your blood sugar levels.

Important Note: If someone is experiencing severe hypoglycemia and is unable to swallow or is unconscious, administer glucagon if available and call for emergency medical assistance immediately.

Hyperglycemia (High Blood Sugar): Symptoms and Management

Hyperglycemia occurs when your blood sugar level is too high, generally above 180 mg/dL after meals or above 130 mg/dL fasting.

Common Symptoms:

  • Frequent urination, especially at night
  • Increased thirst
  • Blurred vision
  • Fatigue
  • Headaches
  • Slow-healing cuts or sores

Management Strategies:

  • Check your blood sugar frequently: Monitor your levels to understand how different foods and activities affect them.
  • Adjust medication: If you take insulin or oral diabetes medications, your doctor may need to adjust your dosage based on your blood sugar readings.
  • Dietary changes: Follow a balanced meal plan recommended by a registered dietitian or diabetes educator. Focus on whole, unprocessed foods, and limit sugary drinks, refined carbohydrates, and saturated fats.
  • Regular exercise: Physical activity helps lower blood sugar levels and improves insulin sensitivity. Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Stay hydrated: Drink plenty of water to help flush out excess sugar through urine.

When to Seek Medical Attention:

  • If your blood sugar is consistently high despite following your treatment plan.
  • If you experience symptoms of diabetic ketoacidosis (DKA), a serious complication of hyperglycemia, which includes:
    • Nausea and vomiting
    • Abdominal pain
    • Fruity-smelling breath
    • Rapid, deep breathing
    • Confusion

Factors Affecting Blood Sugar Levels

Many factors can influence your blood sugar levels, making it essential to understand these variables for effective management.

  • Diet: The type and amount of carbohydrates you consume have the most significant impact on blood sugar. Foods high in refined carbohydrates, such as white bread, pasta, and sugary drinks, can cause rapid spikes.
  • Physical Activity: Exercise helps lower blood sugar levels by increasing insulin sensitivity and allowing cells to use glucose for energy.
  • Stress: Stress hormones like cortisol and adrenaline can raise blood sugar levels.
  • Illness: Infections and illnesses can increase blood sugar levels as the body releases hormones to fight off the infection.
  • Medications: Certain medications, such as corticosteroids and some diuretics, can elevate blood sugar levels.
  • Dehydration: Dehydration can concentrate blood sugar, leading to higher readings.
  • Menstrual Cycle: Hormonal changes during menstruation can affect blood sugar levels in women.
  • Alcohol: Alcohol can initially lower blood sugar, but it can also cause it to rise later, especially if mixed with sugary drinks.
  • Time of Day: Blood sugar levels can vary depending on the time of day due to natural hormone fluctuations. This is known as the "dawn phenomenon," where blood sugar tends to be higher in the morning.

Tips for Monitoring Your Blood Sugar Levels

Accurate and consistent blood sugar monitoring is essential for effective diabetes management.

  • Choose the right monitor: Select a blood glucose meter that is accurate, easy to use, and fits your needs. Consider factors like size, display clarity, and the cost of test strips.
  • Use the correct technique: Follow the manufacturer's instructions for using your meter and test strips. Wash your hands thoroughly before testing to avoid contamination.
  • Keep a log: Record your blood sugar readings in a notebook or a diabetes management app. Include information about the time of day, meals, activities, and any medications you took.
  • Discuss your readings with your healthcare provider: Share your blood sugar logs with your doctor or diabetes educator. They can help you interpret the readings and make adjustments to your treatment plan as needed.
  • Understand your trends: Look for patterns in your blood sugar readings to identify factors that consistently cause highs or lows. This information can help you make informed decisions about your diet, exercise, and medication.
  • Regular A1C tests: Ensure you have your HbA1c checked regularly (usually every 3-6 months) as advised by your healthcare provider. This provides a long-term overview of your blood sugar control.

By understanding your blood sugar level chart and actively managing your levels, you can significantly improve your health and reduce your risk of diabetes-related complications. Always consult with your healthcare provider for personalized advice and treatment.