Which abbreviation is used to indicate a milligram?

The abbreviation "mg" stands for milligram, which is a unit of mass equal to one thousandth of a gram. It is commonly used in the medical field to prescribe and administer medication dosages. Understanding this abbreviation is critical for medication aides, as accurate dosing is essential for patient safety and efficacy of treatment.

The other options represent different measurements commonly used in medicine: "lb" is an abbreviation for pounds, which measures weight; "ml" stands for milliliters, a unit of volume often used for liquid medications; and "tab" is shorthand for tablet, referring to a form of medication. Recognizing these distinctions helps ensure that medication aides can accurately interpret prescriptions and administer drugs properly.