what blood test show diabetes
Asked by: JohnDoe123
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Community Answer
Answered by Dr. Emily Carter, MD
Several blood tests can diagnose diabetes or prediabetes. The most common ones include:
-
A1C Test: Measures your average blood sugar levels over the past 2-3 months. Results are given as a percentage:
- Normal: Below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
-
Fasting Plasma Glucose (FPG) Test: Measures blood sugar after an overnight fast. Results are in mg/dL:
- Normal: Less than 100 mg/dL
- Prediabetes: 100 to 125 mg/dL
- Diabetes: 126 mg/dL or higher
-
Oral Glucose Tolerance Test (OGTT): Measures blood sugar before and 2 hours after drinking a sugary drink. Results are in mg/dL:
- Normal: Less than 140 mg/dL
- Prediabetes: 140 to 199 mg/dL
- Diabetes: 200 mg/dL or higher
-
Random Blood Sugar Test: Measures blood sugar at any time, regardless of when you last ate. A result of 200 mg/dL or higher suggests diabetes.
Your healthcare provider may use one or more of these tests to confirm a diagnosis.