What does the prefix "per" indicate in a medical context?

In a medical context, the prefix "per" signifies "by way of." This prefix is commonly used in various medical terms to denote routes of administration or methods of delivery for medications or treatments. For instance, when a medication is administered "per os," it means it is taken by mouth or orally, while "percutaneous" indicates a procedure done through the skin. The use of "per" helps clarify how therapies are applied or how certain medical procedures are conducted, which is critical for ensuring accuracy and effectiveness in treatment.

The other options do not align with the definition of "per." For example, "away from" is indicated by the prefix "ab," "against" is represented by "anti," and "slow" is typically denoted by the term "brady." Understanding the meaning of medical prefixes is essential for interpreting medical terminology accurately.