by Austin
QUESTION: My fasting glucose is 108 mg/dL and my blood sugar after breakfast is 217 mg/dL. Are these readings high or acceptable? I have already stopped eating sugary foods.
A fasting laboratory glucose of 108 mg/dL is mildly elevated and falls in the prediabetes range of 100–125 mg/dL. A reading of 217 mg/dL after breakfast is also high, but its meaning depends on when it was measured and whether it came from a laboratory or home meter. These results do not confirm diabetes by themselves, but they justify an HbA1c and repeat laboratory fasting glucose.
Answer by Dr. Albana Greca, MD, MMedSc
Hi Austin,
Your results are not an emergency by themselves, but the after-breakfast reading should not be considered normal simply because it was taken soon after eating.
If this was a laboratory test after at least eight hours without food or caloric drinks, 108 mg/dL is in the prediabetes range. Standard fasting ranges for nonpregnant adults are:
One mildly elevated result does not diagnose diabetes. Read more about fasting blood sugar ranges.
Yes, 217 mg/dL is a high after-meal reading. However, there is no standard diagnostic cutoff for a home test taken 10–20 minutes after an ordinary breakfast. Glucose may still be rising at that time, and the result depends on the meal, testing method, and your starting glucose.
If it was measured one to two hours after the meal began, it is above the common post-meal target of below 180 mg/dL used for many adults who already have diabetes. A home reading after an ordinary meal cannot diagnose diabetes or be interpreted as a formal oral glucose tolerance test. Our guide to blood sugar after eating explains the difference.
Arrange an HbA1c and repeat laboratory fasting plasma glucose. HbA1c reflects average glucose over approximately the previous two to three months. In nonpregnant adults, an HbA1c below 5.7% is generally normal, 5.7–6.4% is in the prediabetes range, and 6.5% or higher may indicate diabetes when confirmed.
Your clinician may recommend a formal 75-gram oral glucose tolerance test if the results remain unclear. During this test, glucose is measured fasting and two hours after drinking a standardized glucose solution. A two-hour laboratory result of 200 mg/dL or higher is in the diabetes range.
Symptoms such as excessive thirst, frequent urination, blurred vision, recurrent infections, fatigue, or unexplained weight loss increase concern, but diabetes can also occur without obvious symptoms. See our overview of diabetes tests and diagnostic criteria.
Avoiding sweets and sugary drinks is helpful, but bread, rice, pasta, potatoes, cereal, fruit juice, and large portions of other starches can also raise glucose. Choose balanced meals with nonstarchy vegetables, protein, healthy fats, and measured portions of high-fiber carbohydrate.
Regular physical activity, adequate sleep, and weight management when appropriate may improve insulin sensitivity. Do not use herbs or supplements as a substitute for testing or treatment. A blood sugar log can help you record fasting and consistently timed after-meal readings.
Contact a clinician promptly if fasting readings repeatedly reach 126 mg/dL or higher or after-meal readings repeatedly exceed 200 mg/dL. Seek urgent care for persistent glucose around 300 mg/dL or higher with thirst, dehydration, weakness, or illness. Seek emergency care for vomiting, abdominal pain, difficult breathing, confusion, fainting, high ketones, glucose above 400 mg/dL, or a meter displaying “HI.”
Your fasting result is mildly elevated, while the after-breakfast result needs proper timing and laboratory follow-up. Do not assume that avoiding table sugar alone has solved the problem. Arrange an HbA1c and repeat fasting test, and bring a record of what you ate and exactly when the 217 mg/dL reading was taken.
Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice, diagnosis, or treatment. Do not start, stop, or change medicines, supplements, diet, or exercise plans without speaking with your healthcare provider.
Last reviewed: July 2026.
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