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Documenting your patient’s fluid intake and output is a part of your role as a nursing assistant. The standard unit of measure for doing this is:

A Milliliters

Milliliters is the correct unit of measure. Ounces can also be used to measure fluids, however they are not considered to be the standard unit of measurement for a patient’s fluid intake and output. Meters are used for measuring distance, and milligrams are mostly used to measure solids.