Correct Option (B)
The blood glucose level is typically measured in milligrams per decilitre (mg/dL). This unit quantifies the mass of glucose present in a specific volume of blood plasma. A normal fasting blood glucose level generally ranges from 70 to 100 mg/dL.
Incorrect Options:
Option A (mm of Hg): Millimeters of mercury (mm Hg) is a unit primarily used to measure pressure, most commonly blood pressure. It is not used for expressing the concentration of substances like glucose in blood.
Option C (parts per million): Parts per million (ppm) is a unit of concentration often used for very dilute solutions or for expressing the concentration of pollutants in air or water. While it represents a ratio, it is not the standard unit for blood glucose measurement in clinical practice.
Option D (grams per litre): Grams per litre (g/L) is a unit of concentration that could theoretically be used, but it is not the conventional or clinically accepted unit for blood glucose. Using mg/dL allows for more convenient numerical representation of typical blood glucose values.