You diagnosed a patient with diabetes, which lab below confirms your diagnosis?

Question

Group of answer choices

A 2 hour postprandial blood glucose level of 170 mg/dL on glucose tolerance test.

A fasting plasma glucose level of 100 mg/dL

An elevated BUN

A glycated hemoglobin (HbA1c) value of 7

Answer 1

To confirm a diagnosis of diabetes, the following criteria from the American Diabetes Association (ADA) guidelines can be used:

1. Fasting plasma glucose (FPG) level of 126 mg/dL or higher.
2. 2-hour plasma glucose level of 200 mg/dL or higher during an Oral Glucose Tolerance Test (OGTT).
3. A HbA1c value of 6.5% or higher.
4. A random plasma glucose of 200 mg/dL or higher in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis.

Based on the options provided:

• A 2-hour postprandial blood glucose level of 170 mg/dL on glucose tolerance test (This does not meet the threshold for confirmation of diabetes, which is 200 mg/dL or higher).
• A fasting plasma glucose level of 100 mg/dL (This is considered normal as a fasting level must be 126 mg/dL or higher to be diagnostic).
• An elevated BUN (This is a measure of kidney function, not a test for diabetes diagnosis).
• A glycated hemoglobin (HbA1c) value of 7% (This is diagnostic for diabetes, as it is above the 6.5% threshold).

Therefore, the correct answer is A glycated hemoglobin (HbA1c) value of 7%.