Which abbreviation represents administration under the skin?

The abbreviation that represents administration under the skin is "SC," which stands for "subcutaneous." This method of administration involves injecting medication into the tissue layer between the skin and the muscle, allowing for slower absorption compared to intramuscular or intravenous routes.

Subcutaneous administration is commonly used for certain vaccines and some medications that need to be absorbed gradually. It is particularly useful for long-term therapies and is easier to administer in outpatient settings, as it can often be performed by pet owners at home.

In contrast, the other abbreviations have different meanings: "PO" refers to medication given by mouth, "IM" signifies intramuscular injections directly into the muscle, and "IV" denotes intravenous administration into the bloodstream. Understanding these distinctions is crucial for correctly following veterinary medication protocols.