Fasting Blood Sugar Checker
Enter the required values below to run the educational estimation.
Why Fasting Glucose is Checked
Fasting glucose measures the concentration of sugar in your bloodstream after your digestive system has fully processed recent foods. This provides a baseline measure of how your body regulates blood glucose in the absence of meals.
Interpreting Fasting Blood Sugar Ranges
Fasting levels between 70 and 99 mg/dL are typical. Levels between 100 and 125 mg/dL suggest prediabetes (impaired fasting glucose). A fasting level of 126 mg/dL or higher on two separate tests indicates diabetes.
Factors That Affect Fasting Blood Sugar
Fasting blood sugar is regulated by liver glucose release and basal insulin secretion. Stress, poor sleep, specific medications, and the 'dawn phenomenon' (morning hormone release) can raise fasting glucose levels.
When to Seek Urgent Medical Attention
- Extreme shakiness, sweating, confusion, irritability, or dizziness (severe hypoglycemia).
- Glucose readings above 250 mg/dL accompanied by nausea, vomiting, confusion, or a sweet breath odor.
- Loss of consciousness or seizures.
Frequently Asked Questions
For adults without diabetes, a typical fasting blood sugar level is 70 to 99 mg/dL (3.9 to 5.5 mmol/L).
You should fast (no food or drink except plain water) for at least 8 to 12 hours before drawing blood.
