Community Answer

Answered by Dr. Emily Smith, MD

To determine if you have diabetes, healthcare professionals typically use one or more of the following tests:

  1. A1C Test:

    • Measures your average blood sugar levels over the past 2-3 months.
    • Diagnosis Criteria:
      • Normal: Below 5.7%
      • Prediabetes: 5.7% to 6.4%
      • Diabetes: 6.5% or above
  2. Fasting Plasma Glucose (FPG) Test:

    • Measures blood sugar after an overnight fast.
    • Diagnosis Criteria:
      • Normal: Less than 100 mg/dL
      • Prediabetes: 100 to 125 mg/dL
      • Diabetes: 126 mg/dL or higher
  3. Oral Glucose Tolerance Test (OGTT):

    • Measures blood sugar before and 2 hours after drinking a glucose-rich drink.
    • Diagnosis Criteria:
      • Normal: Less than 140 mg/dL
      • Prediabetes: 140 to 199 mg/dL
      • Diabetes: 200 mg/dL or higher
  4. Random Blood Sugar Test:

    • Measures blood sugar at any time, regardless of when you last ate.
    • Diagnosis Criteria:
      • Diabetes: 200 mg/dL or higher (with symptoms like increased thirst, frequent urination, etc.)

If you suspect you have diabetes, consult a healthcare provider for proper testing and diagnosis.

Last updated: 1/12/2025

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