What does "IV" stand for in modes of medicine?

The term "IV" stands for "intravenous," which is a mode of administering medication or fluids directly into the bloodstream through a vein. This method allows for rapid delivery and is commonly used in medical settings for various treatments, such as hydration, medications, or blood transfusions.

The other options refer to different routes of administration: "in the mouth" would relate to oral medications, "in the muscle" refers to intramuscular injections, and "under the skin" describes subcutaneous injections. Each method has its own indications and purposes, but IV administration is specifically recognized for its efficiency in treating patients quickly due to the direct access to circulation.