OGT Interpreting OGTT Results and Glucose Tolerance Classifications 2

Question 1

What HbA1c range does the ADA use to identify prediabetes?

Accepted Answer

5.7%–6.4%

Answer

The ADA defines prediabetes as an HbA1c of 5.7%–6.4%, which correlates with impaired glucose tolerance found on OGTT.

Question 2

In interpreting OGTT results, a 'flat curve' with minimal glucose rise after the oral glucose load may suggest:

Accepted Answer

Malabsorption or delayed gastric emptying

Answer

A flat OGTT curve indicates minimal glucose absorption after the oral load, which may result from malabsorption or delayed gastric emptying.

Question 3

Reactive hypoglycemia on an extended OGTT is characterized by:

Accepted Answer

A normal initial glucose rise followed by a drop below 70 mg/dL at 2–3 hours

Answer

Reactive hypoglycemia shows a normal or exaggerated early glucose rise, followed by excessive insulin secretion causing glucose to drop below 70 mg/dL at 2–3 hours.

Question 4

For a 3-hour 100g OGTT using Carpenter-Coustan criteria, gestational diabetes is diagnosed when how many values meet or exceed thresholds?

Accepted Answer

2 out of 4

Answer

Per Carpenter-Coustan criteria, gestational diabetes is diagnosed when 2 or more of the 4 measured values (fasting, 1-hour, 2-hour, 3-hour) meet or exceed established thresholds.

Question 5

What is the fasting plasma glucose threshold in the Carpenter-Coustan criteria for the 3-hour 100g OGTT?

Accepted Answer

95 mg/dL

Answer

The Carpenter-Coustan criteria set the fasting threshold at 95 mg/dL, which is lower than the older NDDG (O'Sullivan) criteria value of 105 mg/dL.

OGT - Oral Glucose Tolerance Practice Test

OGT - Oral Glucose Tolerance Practice Test

OGT Interpreting OGTT Results and Glucose Tolerance Classifications 2