The examination for diabetes primarily involves assessment based on symptoms and measuring blood glucose levels through a venous sample. Typical clinical symptoms of diabetes include "three more and one less"; where "three more" refers to dry mouth, increased thirst, and frequent urination, and "one less" refers to weight loss. Thus, generally, when these symptoms are observed, there is an awareness of the possibility of diabetes. Subsequently, one should consult a hospital for further tests, which usually include urine testing and venous blood extraction. For diabetic patients, the glucose level in routine urine tests will significantly increase. Another measure is the direct measurement of blood glucose through venous blood. A fasting blood glucose level of ≥7.0 mmol/L, or a two-hour glucose level of ≥11.1 mmol/L post-OGTT, or a random blood glucose level of ≥11.1 mmol/L, meeting any one of these conditions, combined with the symptoms of diabetes, can diagnose the disease.