**Question:** For diagnosis of diabetes mellitus, Fasting blood glucose level should be more than-

A. 7.0 mmol/L
B. 6.1 mmol/L
C. 5.6 mmol/L
D. 4.8 mmol/L

**Core Concept:**
Diabetes mellitus is a group of chronic disorders characterized by high blood glucose levels due to insulin deficiency, insulin resistance, or both. Fasting blood glucose level is one of the diagnostic criteria for diabetes mellitus.

**Why the Correct Answer is Right:**
Diabetes mellitus is classified into three main types: Type 1 diabetes, Type 2 diabetes, and Gestational diabetes. Fasting blood glucose levels are used as diagnostic criteria for each type.

For Type 1 diabetes: Fasting blood glucose levels should be more than 7.0 mmol/L (126 mg/dL) to diagnose the condition.

For Type 2 diabetes: Fasting blood glucose levels should be more than 6.1 mmol/L (110 mg/dL) to diagnose the condition.

For Gestational diabetes: Fasting blood glucose levels should be more than 5.6 mmol/L (100 mg/dL) to diagnose the condition, as it is a temporary condition occurring during pregnancy.

**Why Each Wrong Option is Incorrect:**

A. 4.8 mmol/L (85 mg/dL) is too low, which would not indicate diabetes.

B. 6.1 mmol/L (109 mg/dL) is higher than the diagnostic threshold for Type 2 diabetes, making it an incorrect choice for diagnosing this type.

**Clinical Pearl:**

Diagnosis of diabetes mellitus relies on interpreting blood glucose levels in the context of the specific type of diabetes. Fasting blood glucose levels should be interpreted according to the type of diabetes and the corresponding diagnostic threshold mentioned above. A correct interpretation ensures accurate diagnosis and treatment for patients with diabetes.