The abbreviation "iv" is used to denote which type of administration?

The abbreviation "iv" stands for "intravenous," which refers to the administration of medication directly into a patient's vein. This method allows for rapid delivery of drugs into the bloodstream, enabling immediate effects, which is crucial in medical emergencies or when faster therapeutic action is required. Intravenous administration is often used in hospitals for fluids, medications, and nutrients.

The other options do not accurately describe the "iv" abbreviation. Involuntary refers to actions that occur without conscious control and is not related to medication administration. Intranasal pertains to administration through the nasal passages but is not represented by "iv." Immunization refers to the process of administering vaccines but does not use the "iv" abbreviation either. Thus, "intravenous" is the correct interpretation of "iv" in the context of medication administration.