What is the unit of measurement a nurse should calculate when administering medications in mL?

The correct choice is milliliters, which is the standard unit of measurement used for liquid medications in nursing practice. When administering medications, nurses commonly measure doses in mL, as this unit allows for precise dosing of liquid formulations, which is essential for patient safety and efficacy of treatment.

Grams and micrograms are typically used for measuring solid doses or for medication that may require smaller scale measurements, such as powders or very potent medications. Liters, while also a measure of volume, are generally too large for individual doses of medications, especially when dealing with the more commonly administered volumes found in nursing practice. This makes milliliters the appropriate and widely accepted unit for dosage calculations in medication administration.