Diabetes is diagnosed through several tests: Fasting Blood Sugar Test: Measures blood glucose levels after fasting for at least 8 hours. Oral Glucose Tolerance Test (OGTT): Measures blood sugar before and after consuming a glucose-rich drink. Hemoglobin A1c Test: Reflects average blood glucose levels over the past 2-3 months. Random Blood Sugar Test: Measures blood glucose at any time, regardless of food intake. Diagnosis is confirmed if test results show elevated blood sugar levels. These tests help determine the presence and type of diabetes, guiding appropriate treatment and management strategies.