OGT Interpreting OGTT Results and Glucose Tolerance Classifications

Question 1

What fasting plasma glucose level is classified as impaired fasting glucose (IFG) according to ADA criteria?

Accepted Answer

100–125 mg/dL

Answer

70–99 mg/dL

Answer

126–140 mg/dL

Answer

140–199 mg/dL

Question 2

A 2-hour plasma glucose of 155 mg/dL following a 75g oral glucose load is classified as:

Accepted Answer

Impaired glucose tolerance (IGT)

Answer

Normal glucose tolerance

Answer

Diabetes mellitus

Answer

Hypoglycemia

Question 3

Which 2-hour OGTT plasma glucose value meets the ADA diagnostic threshold for diabetes mellitus?

Accepted Answer

200 mg/dL

Answer

180 mg/dL

Answer

190 mg/dL

Answer

199 mg/dL

Question 4

According to ADA guidelines, the term 'prediabetes' encompasses which glucose abnormalities?

Accepted Answer

Both IFG and IGT

Answer

Only impaired fasting glucose (IFG)

Answer

Only impaired glucose tolerance (IGT)

Answer

Borderline diabetes and reactive hypoglycemia

Question 5

A patient's OGTT 2-hour value is 145 mg/dL. What is the typical first-line intervention?

Accepted Answer

Dietary modification and increased physical activity

Answer

No intervention; repeat in 5 years

Answer

Immediate insulin therapy

Answer

Oral hypoglycemic agents

Question 6

Which laboratory value, when combined with the 2-hour OGTT result, provides the most complete picture of glucose tolerance?

Accepted Answer

Fasting plasma glucose

Answer

Random plasma glucose

Answer

Urine glucose

Answer

Serum ketones

Question 7

A patient has a fasting glucose of 102 mg/dL and a 2-hour OGTT glucose of 195 mg/dL. How should this result be classified?

Accepted Answer

Both IFG and IGT (combined prediabetes)

Answer

Normal glucose tolerance

Answer

IFG only

Answer

IGT only