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The Ultimate Blood Sugar Levels Chart: Fasting, Post-Meal, and A1c

04 Sep 2025 by Osamah A. Al Ali, M.B., Ch.B.

The Ultimate Blood Sugar Levels Chart: Fasting, Post-Meal, and A1c

Understanding your blood sugar levels is crucial for managing diabetes, prediabetes, and overall health. This article provides a comprehensive blood sugar levels chart, covering fasting glucose, post-meal levels, and A1c targets. We'll explain what these numbers mean and how they impact your well-being. Let's dive in! Hyperglycemia Vs Hypoglycemia Understanding High And Low Blood Sugar

What Are Blood Sugar Levels and Why Do They Matter?

Blood sugar levels, also known as blood glucose levels, measure the concentration of glucose in your blood. Glucose is your body's primary energy source, derived from the food you eat. Maintaining healthy blood glucose is essential for proper organ function and preventing chronic diseases. Decoding Your A1C Test What Your A1C Levels Really Mean

When your blood sugar levels are consistently too high (hyperglycemia), it can lead to conditions like:

  • Diabetes
  • Heart disease
  • Kidney disease
  • Nerve damage (neuropathy)
  • Eye damage (retinopathy)

Conversely, when blood sugar levels are too low (hypoglycemia), it can cause symptoms like:

  • Shakiness
  • Sweating
  • Confusion
  • Dizziness
  • In severe cases, loss of consciousness

Therefore, monitoring and managing your blood sugar is vital, especially if you have diabetes or are at risk.

Understanding Fasting Blood Sugar Levels

Fasting blood sugar is measured after at least eight hours of not eating. This test provides a baseline understanding of how your body regulates glucose without recent food intake.

Fasting Blood Sugar Chart

Category Fasting Blood Sugar Level (mg/dL)
Normal Less than 100
Prediabetes 100 to 125
Diabetes 126 or higher (on two separate tests)
  • Normal: A fasting blood sugar level below 100 mg/dL is considered normal and indicates healthy glucose metabolism.
  • Prediabetes: A fasting blood sugar between 100 and 125 mg/dL signifies prediabetes. This means you're at higher risk of developing type 2 diabetes. Lifestyle changes like diet and exercise can help reverse prediabetes.
  • Diabetes: A fasting blood sugar of 126 mg/dL or higher, confirmed by two separate tests, typically indicates diabetes.

Post-Meal (Postprandial) Blood Sugar Levels

Post-meal blood sugar, also called postprandial blood sugar, is measured one to two hours after eating. This test shows how your body processes glucose after a meal. Monitoring postprandial glucose levels helps you understand how different foods affect your blood sugar. Prediabetes Range What Your Blood Sugar Diagnosis Levels Really Mean

Post-Meal Blood Sugar Chart (1-2 Hours After Eating)

Category Post-Meal Blood Sugar Level (mg/dL)
Normal Less than 140
Prediabetes 140 to 199
Diabetes 200 or higher
  • Normal: For individuals without diabetes, post-meal blood sugar should typically be less than 140 mg/dL within one to two hours after eating.
  • Prediabetes: A post-meal reading between 140 and 199 mg/dL may indicate impaired glucose tolerance, suggesting prediabetes.
  • Diabetes: A post-meal reading of 200 mg/dL or higher suggests diabetes.

Understanding A1c (Glycated Hemoglobin)

The A1c test measures your average blood sugar levels over the past two to three months. It provides a broader picture of blood glucose control compared to single-point-in-time tests like fasting or post-meal measurements. Hemoglobin is a protein in red blood cells that carries oxygen. When glucose builds up in the blood, it attaches to hemoglobin. The A1c test measures the percentage of hemoglobin that has glucose attached.

A1c Chart

Category A1c Level (%)
Normal Less than 5.7
Prediabetes 5.7 to 6.4
Diabetes 6.5 or higher
  • Normal: An A1c below 5.7% indicates normal blood sugar control over the past few months.
  • Prediabetes: An A1c between 5.7% and 6.4% signifies prediabetes and a higher risk of developing type 2 diabetes.
  • Diabetes: An A1c of 6.5% or higher, confirmed by a second test, indicates diabetes. For people with diabetes, the target A1c is often below 7%, but it may be different for each individual based on their health and age.

Factors Affecting Blood Sugar Levels

Many factors can influence blood sugar levels, including:

  • Diet: Carbohydrates, especially refined carbs, significantly impact blood sugar.
  • Physical Activity: Exercise helps lower blood sugar by increasing insulin sensitivity and using glucose for energy.
  • Stress: Stress hormones can raise blood glucose levels.
  • Medications: Certain medications, like steroids, can increase blood sugar. Diabetes medications are used to lower blood sugar levels.
  • Illness: Illness and infections can increase blood sugar levels.
  • Sleep: Lack of sleep or poor sleep quality can affect blood glucose.
  • Hydration: Dehydration can elevate blood sugar concentration.
  • Menstrual Cycle: Hormonal changes during menstruation can impact blood sugar levels in women.

Tips for Maintaining Healthy Blood Sugar Levels

  • Follow a Balanced Diet: Emphasize whole foods, including non-starchy vegetables, lean proteins, and healthy fats. Limit processed foods, sugary drinks, and refined carbohydrates.
  • Engage in Regular Physical Activity: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Monitor Your Blood Sugar Regularly: If you have diabetes or prediabetes, check your blood sugar as recommended by your healthcare provider.
  • Manage Stress: Practice stress-reduction techniques such as meditation, yoga, or deep breathing exercises.
  • Get Enough Sleep: Aim for 7-9 hours of quality sleep per night.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Work Closely with Your Healthcare Team: Discuss your blood sugar targets and adjust your treatment plan as needed.

Conclusion

Understanding your blood sugar levels is crucial for preventing complications associated with diabetes and prediabetes. By using this comprehensive blood sugar levels chart and following the tips provided, you can take proactive steps towards managing your blood glucose and improving your overall health. Remember to consult with your healthcare provider for personalized advice and management strategies tailored to your individual needs. Effective blood sugar management will significantly improve your long-term health.

References and Further Reading