What is the recommended site for Sub-Q injection for an adult?

The recommended site for a subcutaneous (Sub-Q) injection in adults is indeed the fatty tissue over the triceps of the upper arm. This area is chosen because it provides ample adipose tissue, which is essential for effective absorption of the medication. Subcutaneous injections require a site with sufficient fat that allows the medication to be absorbed slowly into the bloodstream.

Using the fatty tissue over the triceps is advantageous for several reasons: it minimizes injury to muscle tissue and major nerves or blood vessels, which can occur if injections are performed in areas without adequate adipose tissue. Additionally, this site is easily accessible and typically has a sufficient amount of subcutaneous fat to accommodate the injection process comfortably.

While other sites like the vastus lateralis muscle and the deltoid muscle are suitable for intramuscular injections, they are not the correct choice for subcutaneous administration. The vastus lateralis, located on the thigh, is primarily used for intramuscular injections due to the larger muscle mass. The deltoid muscle can also be used, but it is mostly indicated for intramuscular injections and has less fatty tissue compared to the area over the triceps, which makes it less ideal for a subcutaneous injection.