Final answer:
An individual with a fasting plasma glucose level of 90 mg/dl and an oral glucose tolerance test result of 120 mg/dl falls within the normal range for blood glucose levels and does not have diabetes mellitus.
Step-by-step explanation:
An individual with a fasting plasma glucose level of 90 mg/dl and an oral glucose tolerance test (GTT) value of 120 mg/dl does not show signs of diabetes mellitus. According to the information provided, a normal fasting blood glucose level ranges between 60-90 mg/100 ml and may be up to 80-120 mg/100 ml using reduction methods. The oral glucose tolerance test result for this individual is also within the normal range since blood glucose should rise after consuming glucose and then return to normal levels within about 2 ½ hours, indicating that insulin is being properly secreted and is regulating blood sugar levels.
Since the person has a fasting blood glucose level below 100, which is normal, and the result of the glucose tolerance test does not indicate hyperglycemia, the individual can tolerate glucose well and is not considered to be in the pre-diabetes or diabetes categories.