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

ADA defines IFG as a fasting plasma glucose of 100–125 mg/dL, representing a prediabetic state below the 126 mg/dL diabetes threshold.

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

A 2-hour glucose of 140–199 mg/dL after a 75g OGTT is classified as impaired glucose tolerance (IGT), a prediabetic state.

Question 3

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

Accepted Answer

200 mg/dL

Answer

A 2-hour plasma glucose ≥200 mg/dL after a 75g OGTT is diagnostic for diabetes mellitus per ADA guidelines.

Question 4

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

Accepted Answer

Both IFG and IGT

Answer

The ADA uses 'prediabetes' as an umbrella term covering both impaired fasting glucose (IFG) and impaired glucose tolerance (IGT), either separately or together.

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

Impaired glucose tolerance (2-hour glucose 140–199 mg/dL) is managed first with lifestyle interventions—diet and exercise—to prevent progression to diabetes.

OGT - Oral Glucose Tolerance Practice Test

OGT - Oral Glucose Tolerance Practice Test

OGT Interpreting OGTT Results and Glucose Tolerance Classifications