OGT Interpreting OGTT Results and Glucose Tolerance Classifications 3

Question 1

According to WHO criteria, what 2-hour OGTT plasma glucose value is diagnostic for diabetes mellitus?

Accepted Answer

≥200 mg/dL

Answer

≥180 mg/dL

Answer

≥190 mg/dL

Answer

≥220 mg/dL

Question 2

The IADPSG recommends diagnosing gestational diabetes when fasting glucose exceeds which value?

Accepted Answer

92 mg/dL

Answer

85 mg/dL

Answer

95 mg/dL

Answer

100 mg/dL

Question 3

A patient's 1-hour value during a 3-hour GDM OGTT is 195 mg/dL (Carpenter-Coustan threshold: 180 mg/dL). What does this single abnormal value indicate?

Accepted Answer

The finding is borderline; at least one more abnormal value is needed for diagnosis

Answer

Gestational diabetes is confirmed

Answer

The patient requires immediate insulin

Answer

The test must be repeated immediately

Question 4

When comparing ADA and WHO interpretation criteria for the standard 75g OGTT, which statement is correct?

Accepted Answer

Both use ≥200 mg/dL as the 2-hour diagnostic threshold for diabetes

Answer

ADA uses 180 mg/dL and WHO uses 200 mg/dL as the 2-hour diabetes threshold

Answer

WHO does not use OGTT for diabetes diagnosis

Answer

ADA requires three abnormal values while WHO requires only one

Question 5

Isolated post-challenge hyperglycemia (elevated 2-hour OGTT with normal fasting glucose) is clinically significant because:

Accepted Answer

It independently predicts cardiovascular risk and progression to diabetes

Answer

It indicates immediate need for insulin therapy

Answer

It is not clinically significant when fasting glucose is normal

Answer

It only occurs in gestational diabetes

Question 6

How does a 1-hour plasma glucose ≥155 mg/dL during a 75g OGTT relate to clinical risk assessment?

Accepted Answer

It is associated with increased cardiovascular and diabetes risk

Answer

It has no established clinical significance

Answer

Only the 2-hour value predicts cardiovascular risk

Answer

The 1-hour value is only relevant in gestational diabetes

Question 7

What is the primary purpose of repeating an OGTT on a different day when results initially show impaired glucose tolerance?

Accepted Answer

To confirm the diagnosis before initiating management

Answer

Because a single OGTT is never sufficient for any glucose diagnosis

Answer

OGTT results do not require confirmation

Answer

To assess diurnal variation in glucose levels