A nurse is reinforcing teaching with a newly hired nurse about documentation in the medical record. Which of the following abbreviations should the newly hired nurse identify as a metric unit of weight?

A. mcg: This abbreviation stands for microgram, which is a metric unit of weight commonly used in medication dosing. It is part of the metric system, where 1,000 mcg = 1 mg (milligram). B. mL: Milliliter is a metric unit of volume, not weight. It is used to measure liquid quantities, such as medication doses or fluid intake/output. C. Ib: "Pound" (lb or Ib) is a non-metric (imperial) unit of weight. Although commonly used in the U.S., it is not part of the metric system. D. oz: "Ounce" is also a non-metric unit of weight or volume, depending on context, used in the imperial system. It is not used in metric-based medication dosing.