Is a Fasting Blood Sugar of 90 mg/dL Considered High? - Internal Medicine

More Info

---

A fasting blood sugar level of 90 mg/dL is generally considered to be within the normal range. According to the American Diabetes Association (ADA), normal fasting blood glucose levels are defined as being less than 100 mg/dL. Levels between 100 mg/dL and 125 mg/dL are classified as "impaired fasting glucose," which is a precursor to diabetes, while levels of 126 mg/dL or higher on two separate tests indicate diabetes.

Your concern about a fasting blood sugar level of 90 mg/dL after fasting for ten hours is understandable, especially if you are monitoring your health closely. However, it is important to note that blood sugar levels can fluctuate due to various factors, including diet, physical activity, stress, and even the time of day. A reading of 90 mg/dL is not only normal but also indicates that your body is effectively managing glucose levels.

To provide a bit more context, fasting blood sugar levels can be influenced by several factors:
1. Diet: The types of food you consume prior to fasting can impact your blood sugar levels. A diet high in refined carbohydrates and sugars can lead to higher fasting blood sugar levels, while a balanced diet rich in whole grains, lean proteins, and healthy fats can help maintain stable blood sugar levels.

2. Physical Activity: Regular exercise can improve insulin sensitivity and help regulate blood sugar levels. If you have been more active or have made changes to your exercise routine, this could positively influence your fasting blood sugar readings.

3. Stress and Sleep: Stress hormones like cortisol can raise blood sugar levels. Additionally, poor sleep can affect how your body processes glucose. Ensuring you manage stress and get adequate sleep can help maintain healthy blood sugar levels.

4. Hydration: Dehydration can lead to higher blood sugar levels. It’s important to stay well-hydrated, especially during fasting periods.

5. Timing of the Test: As you mentioned, the timing of your blood test can also play a role. Blood sugar levels can vary throughout the day, and testing at different times can yield different results.

If you are consistently seeing fasting blood sugar levels in the 90s or higher, it may be worth discussing with your healthcare provider. They may recommend further monitoring or testing, such as an oral glucose tolerance test or checking your hemoglobin A1c levels, which provide a broader picture of your blood sugar control over time.

In conclusion, a fasting blood sugar level of 90 mg/dL is not considered high and falls within the normal range. However, if you have concerns about your blood sugar levels or if you have a family history of diabetes, it is always a good idea to consult with your healthcare provider for personalized advice and recommendations. Regular monitoring and maintaining a healthy lifestyle are key components in preventing the onset of diabetes and managing overall health.