Decoding Your Blood Sugar Test Results: What mg/dL & mmol/L Mean

23 Aug 2025

Decoding Your Blood Sugar Test Results: What mg/dL & mmol/L Mean Understanding your blood sugar levels is essential for managing your health, espe...

Decoding Your Blood Sugar Test Results: What mg/dL & mmol/L Mean

Understanding your blood sugar levels is essential for managing your health, especially if you have diabetes or are at risk of developing it. Blood sugar test results can seem confusing, especially when you encounter different units of measurement like mg/dL and mmol/L. This article breaks down what these units mean, how to interpret your results, and what steps to take based on your blood sugar levels.

Why is Blood Sugar Monitoring Important?

Monitoring your blood glucose (sugar) levels is vital for several reasons:

  • Diabetes Management: For individuals with diabetes, regular monitoring helps manage blood sugar levels within the target range, reducing the risk of complications.
  • Early Detection: Regular checks can help detect prediabetes, allowing for lifestyle changes that may prevent the onset of type 2 diabetes.
  • Personalized Insights: Monitoring provides personalized insights into how food, exercise, and medication affect your blood sugar levels.
  • Overall Health: Maintaining stable blood sugar is crucial for energy levels, mood, and cognitive function.

Understanding the Units: mg/dL and mmol/L

Blood sugar levels are typically measured using two different units: milligrams per deciliter (mg/dL) and millimoles per liter (mmol/L).

  • mg/dL (milligrams per deciliter): This is the standard unit of measurement in the United States. It represents the weight of glucose (in milligrams) in a specific volume of blood (one deciliter, which is approximately 3.4 fluid ounces).
  • mmol/L (millimoles per liter): This unit is commonly used in Canada, Europe, and other parts of the world. It measures the amount of glucose molecules (in millimoles) in a specific volume of blood (one liter).

Converting Between mg/dL and mmol/L

If you need to convert between these units, you can use the following formula:

  • mg/dL to mmol/L: Divide the mg/dL value by 18.
  • mmol/L to mg/dL: Multiply the mmol/L value by 18.

Related reading: Beyond Diet 5 Surprising Ways To Lower Your Blood Glucose Levels

For example, if your blood sugar is 100 mg/dL, the equivalent value in mmol/L is 100 / 18 = 5.56 mmol/L.

Normal Blood Sugar Ranges

Normal blood sugar ranges vary depending on the time of day and whether you have eaten recently. Here are general guidelines for people without diabetes:

  • Fasting Blood Sugar (after at least 8 hours of fasting):
    • mg/dL: Less than 100 mg/dL
    • mmol/L: Less than 5.6 mmol/L
  • 2-Hour Postprandial (2 hours after eating):
    • mg/dL: Less than 140 mg/dL
    • mmol/L: Less than 7.8 mmol/L

These ranges may vary slightly depending on the specific laboratory or healthcare provider, so it’s essential to discuss your results with a doctor.

Understanding Your Blood Sugar Test Results

Related reading: Your Fasting Blood Sugar Level What S Normal And When To Worry

Different types of blood sugar tests provide different insights into your glucose levels. Here’s a breakdown:

1. Fasting Plasma Glucose (FPG) Test

This test measures your blood sugar after an overnight fast.

  • Normal: Less than 100 mg/dL (5.6 mmol/L)
  • Prediabetes: 100 to 125 mg/dL (5.6 to 6.9 mmol/L)
  • Diabetes: 126 mg/dL or higher (7.0 mmol/L or higher) on two separate tests.

2. Oral Glucose Tolerance Test (OGTT)

The OGTT measures your blood sugar levels before and after you drink a sugary liquid.

  • Normal: Less than 140 mg/dL (7.8 mmol/L) 2 hours after drinking the liquid.
  • Prediabetes: 140 to 199 mg/dL (7.8 to 11.0 mmol/L) 2 hours after drinking the liquid.
  • Diabetes: 200 mg/dL or higher (11.1 mmol/L or higher) 2 hours after drinking the liquid.

3. A1C Test

The A1C test, also known as the hemoglobin A1c test, provides an average of your blood sugar control over the past 2 to 3 months. It's not reported in mg/dL or mmol/L, but as a percentage.

  • Normal: Less than 5.7%
  • Prediabetes: 5.7% to 6.4%
  • Diabetes: 6.5% or higher

Here's a HTML table illustrating the A1C levels and their corresponding estimated average glucose levels:

A1C (%) Estimated Average Glucose (eAG) mg/dL Estimated Average Glucose (eAG) mmol/L
5.7 117 6.5
6.0 126 7.0
6.5 140 7.8
7.0 154 8.6
7.5 169 9.4

4. Random Blood Sugar Test

This test is taken at any time of the day, regardless of when you last ate. A random blood sugar level of 200 mg/dL (11.1 mmol/L) or higher, along with symptoms like increased thirst and frequent urination, may indicate diabetes.

What To Do If Your Blood Sugar Is High

If your blood sugar test results indicate elevated levels (hyperglycemia), consult your healthcare provider promptly. They can provide personalized guidance based on your medical history and individual needs. In the meantime, here are some general recommendations:

  1. Review your diet: Evaluate your dietary habits. Reduce your intake of sugary foods, processed carbohydrates, and sweetened beverages. Focus on a balanced diet rich in fiber, lean proteins, and healthy fats.
  2. Increase physical activity: Regular exercise helps improve insulin sensitivity and lowers blood sugar levels. Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  3. Stay hydrated: Drink plenty of water to help flush out excess glucose from your body.
  4. Monitor regularly: If you have been diagnosed with diabetes, adhere to your doctor’s recommended monitoring schedule. Keeping a log of your blood sugar levels can help you and your doctor track trends and make necessary adjustments.
  5. Follow medication guidelines: If you are taking medications to manage diabetes, ensure you are taking them as prescribed.

What To Do If Your Blood Sugar Is Low

If your blood sugar test results indicate low levels (hypoglycemia), it's equally important to address it promptly. Here are some general recommendations:

  1. Follow the 15-15 Rule: Consume 15 grams of fast-acting carbohydrates, such as glucose tablets, fruit juice, or regular (non-diet) soda. Wait 15 minutes and recheck your blood sugar. If it's still low, repeat the process.
  2. Identify the Cause: Determine what may have caused the low blood sugar, such as skipping a meal, taking too much insulin, or exercising more than usual.
  3. Adjust Medication (if necessary): If you have diabetes, work with your doctor to adjust your medication dosage to prevent future episodes of hypoglycemia.
  4. Carry a Source of Fast-Acting Carbohydrates: Always keep a source of fast-acting carbohydrates with you, especially if you take insulin or other diabetes medications.
  5. Inform Others: Make sure your family, friends, and coworkers know how to recognize the symptoms of hypoglycemia and how to assist you if you become unresponsive.

Lifestyle Changes for Blood Sugar Management

Related reading: What Are The Dangers Of High Blood Sugar Hyperglycemia

Regardless of whether your blood sugar test results are normal, prediabetic, or diabetic, implementing certain lifestyle changes can have a significant impact on your overall health and glucose management.

  • Balanced Diet: Focus on a diet rich in non-starchy vegetables, lean proteins, and whole grains. Limit processed foods, sugary drinks, and excessive amounts of carbohydrates.
  • Regular Exercise: Aim for at least 30 minutes of moderate-intensity exercise most days of the week. Incorporate both aerobic exercises (like walking or swimming) and strength training.
  • Weight Management: Maintaining a healthy weight can improve insulin sensitivity and lower blood sugar levels.
  • Stress Management: Chronic stress can affect blood sugar levels. Practice relaxation techniques such as meditation, yoga, or deep breathing exercises.
  • Adequate Sleep: Aim for 7-9 hours of quality sleep each night. Poor sleep can negatively impact blood sugar control.

Conclusion

Understanding your blood sugar test results and what they mean in both mg/dL and mmol/L is a critical step in managing your health and preventing complications associated with diabetes. By regularly monitoring your levels, making informed lifestyle choices, and working closely with your healthcare provider, you can effectively manage your blood sugar and improve your overall well-being. Remember that the journey to better health is a collaborative effort, and your healthcare team is there to support you every step of the way.