how to diagnose dm
Asked by: HealthSeeker123
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Community Answer
Answered by Dr. Emily Carter, MD
Diabetes mellitus (DM) is typically diagnosed through several blood tests that measure blood glucose levels. Here are the common methods:
1. A1C Test
- What it measures: Average blood glucose 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
- What it measures: Blood glucose 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)
- What it measures: Blood glucose 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 Plasma Glucose Test
- What it measures: Blood glucose at any time, regardless of when you last ate.
- Diagnosis Criteria:
- Diabetes: 200 mg/dL or higher (with symptoms like increased thirst, urination, and fatigue)
When to Test
- Adults over 45: Regular screening is recommended, especially if overweight or with other risk factors.
- Younger Adults: Test if overweight and have additional risk factors like family history, high blood pressure, or physical inactivity.
Always consult with a healthcare provider for accurate diagnosis and personalized advice.