What does the prefix "trans-" indicate in medical terms?

The prefix "trans-" in medical terminology indicates the idea of "across" or "through." This prefix is commonly used to describe processes or conditions where something moves from one side to another or permeates through a structure.

For example, the term "transfusion" refers to the process of transferring blood or plasma across into a patient's body. Similarly, "transdermal" indicates medication that crosses through the skin to enter the systemic circulation. This indicates a significant movement or change that takes place across a barrier or throughout a structure, which is essential in conveying medical concepts accurately. Understanding this prefix aids in deciphering various medical terms that involve movement, transfer, or passage across boundaries.