Pre-Meal Blood Sugar Levels: What Does 105 Mean? - Internal Medicine

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Fasting blood glucose is 105 mg/dL and HbA1c is 5.3%?


I apologize for the inconvenience.
Your fasting blood glucose level of 105 mg/dL falls within the laboratory's reference range of 70-110 mg/dL, which indicates that it is considered normal according to their standards.
While some sources suggest that a fasting blood glucose level should be below 100 mg/dL to be optimal, your result does not indicate a significant issue since it is not marked as abnormal by the laboratory.
Additionally, a hemoglobin A1c (HbA1c) level of 5.3% suggests that your average blood glucose levels over the past two to three months have been within a normal range, indicating good glycemic control.

It is always best to follow the guidance of your healthcare provider, as they can interpret your results in the context of your overall health.
If you have any concerns or if there are changes in your health, it would be advisable to discuss them with your doctor.
Thank you for your question!

Chen, 20~29 year old female. Ask Date: 2021/06/18

Dr. Hong Yuanbin reply Internal Medicine


Hello, based on your test results, your fasting blood glucose is 105 mg/dL and your hemoglobin A1c is 5.3%.
Currently, these values do not meet the criteria for a diabetes diagnosis.
It is recommended to follow up later.
Thank you for your inquiry.

Reply Date: 2021/06/18

More Info


Understanding pre-meal blood sugar levels is crucial for managing your health, especially if you have concerns about diabetes. In your case, a pre-meal blood sugar level of 105 mg/dL falls within the laboratory's reference range of 70-110 mg/dL. This means that according to the lab's standards, your blood sugar level is considered normal. However, you mentioned that many sources online suggest that a normal fasting blood sugar level should be below 100 mg/dL. This discrepancy can be confusing, so let's break it down.

Firstly, it's important to recognize that different laboratories may have slightly different reference ranges based on their testing methods and population data. The American Diabetes Association (ADA) defines normal fasting blood glucose levels as less than 100 mg/dL, while levels between 100-125 mg/dL are classified as "impaired fasting glucose," which is a risk factor for developing type 2 diabetes. A level of 126 mg/dL or higher on two separate tests indicates diabetes.

In your case, a reading of 105 mg/dL suggests that you are on the borderline of impaired fasting glucose. While your laboratory's reference range indicates that you are within normal limits, the fact that your level is close to 100 mg/dL means that it is worth monitoring. The absence of a "red flag" in your lab report and your doctor's reassurance that it is not a significant concern are positive signs. However, it is advisable to keep an eye on your blood sugar levels, especially if you have a family history of diabetes.

Your glycated hemoglobin (HbA1c) level of 5.3% is another important indicator. The HbA1c test reflects your average blood sugar levels over the past two to three months. An HbA1c level below 5.7% is considered normal, while levels between 5.7% and 6.4% indicate prediabetes, and 6.5% or higher suggests diabetes. Since your HbA1c is well within the normal range, it suggests that your blood sugar levels have been well-controlled over the past few months.

To summarize, while your pre-meal blood sugar level of 105 mg/dL is technically within the laboratory's normal range, it is close to the threshold for impaired fasting glucose. Your HbA1c level of 5.3% indicates good overall blood sugar control. Here are some recommendations to maintain your health:
1. Regular Monitoring: Continue to monitor your blood sugar levels regularly, especially if you notice any changes in your diet, weight, or physical activity.

2. Healthy Lifestyle: Maintain a balanced diet rich in whole grains, fruits, vegetables, lean proteins, and healthy fats. Limit your intake of refined sugars and processed foods.

3. Physical Activity: Engage in regular physical activity, such as walking, jogging, or any form of exercise that you enjoy. Aim for at least 150 minutes of moderate-intensity exercise per week.

4. Weight Management: If you are overweight, losing even a small percentage of your body weight can significantly reduce your risk of developing diabetes.

5. Regular Check-ups: Schedule regular check-ups with your healthcare provider to monitor your blood sugar levels and discuss any concerns you may have.

6. Stay Informed: Educate yourself about diabetes and its risk factors, especially since you have a family history of the condition.

In conclusion, while your current readings are reassuring, staying proactive about your health is essential. By maintaining a healthy lifestyle and keeping track of your blood sugar levels, you can significantly reduce your risk of developing diabetes in the future. If you have further questions or concerns, don't hesitate to reach out to your healthcare provider for personalized advice.

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