Which option is the abbreviation for International Units?

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Multiple Choice

Which option is the abbreviation for International Units?

Explanation:
The concept being tested is recognizing the standard shorthand used for units of potency or activity in medication labeling. The correct shorthand for International Units is IU. This abbreviation is widely used on prescriptions and labels to indicate biological activity rather than a mass or volume. The other options don’t fit because they refer to dosing instructions or non-abbreviated phrases, not to the unit itself. PRN means “as needed,” not a unit of measurement. q.s stands for “quantum satis” or “quantity sufficient,” which tells you to supply enough to meet the need, again not a unit. Writing out “International units” in full isn’t an abbreviation, so it wouldn’t be used as the shorthand for the unit.

The concept being tested is recognizing the standard shorthand used for units of potency or activity in medication labeling. The correct shorthand for International Units is IU. This abbreviation is widely used on prescriptions and labels to indicate biological activity rather than a mass or volume.

The other options don’t fit because they refer to dosing instructions or non-abbreviated phrases, not to the unit itself. PRN means “as needed,” not a unit of measurement. q.s stands for “quantum satis” or “quantity sufficient,” which tells you to supply enough to meet the need, again not a unit. Writing out “International units” in full isn’t an abbreviation, so it wouldn’t be used as the shorthand for the unit.

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