Final answer:
In a glucose tolerance screening, after drinking 100 grams of glucose, the blood glucose levels should reach back to normal within about 2.5 hours for a normal person. For a person with diabetes, the blood glucose level may not come down to normal even after 2.5 hours, indicating glucose intolerance and a diagnosis of diabetes.
Step-by-step explanation:
In a glucose tolerance screening, after drinking 100 grams of glucose, we want the blood glucose levels to be within a certain range 3 hours after drinking. For a normal person, the blood glucose level should reach back to normal within about 2.5 hours. The fasting blood glucose level of a normal person is around 75 mg/100 ml, while the post-prandial (after meals) level is between 100-140 mg/100 ml.
For a person with diabetes, the blood glucose level may not come down to normal even after 2.5 hours. In this case, the person is said to be intolerant to glucose and is diagnosed with diabetes. It is important to note that blood glucose levels can vary depending on various factors, so it is best to consult with a healthcare professional for an accurate diagnosis.