A normal blood sugar after eating is usually less than 180 mg/dL when checked with a fingerstick about 2 hours after the start of a meal. This is one of the main reference values used to assess blood sugar after eating, especially in people with diabetes.
To find out if your blood sugar levels suggest diabetes, you may need an oral glucose tolerance test (OGTT). This lab test measures your blood sugar 2 hours after you drink a solution containing 75 grams of glucose. A result between 140 and 199 mg/dL suggests prediabetes, and a result of 200 mg/dL or higher indicates diabetes.
Still, normal blood sugar values after eating and treatment targets can vary depending on the test used to measure glucose, the time the test is done, and factors such as a person’s age and overall health. Because of this, diabetes management should always follow a health provider's guidance.