Where is a subcutaneous injection made?

A subcutaneous injection is specifically administered in the layer of tissue between the skin and the muscle. This method allows for the medication to be absorbed more slowly into the bloodstream compared to other routes, such as intramuscular or intravenous injections. The subcutaneous layer contains fewer blood vessels than muscle tissue, which makes it ideal for certain medications that need to be absorbed gradually, such as vaccines or insulin.

The other choices involve different sites for injection: injecting into the vein refers to intravenous methods, which provide immediate access to the circulatory system; administering in the muscle pertains to intramuscular injections, where medications are absorbed more quickly; and injecting into the abdominal cavity involves a different procedure entirely, typically associated with specific medical treatments rather than routine injections. Each method has distinct implications for how quickly a drug will take effect and how it will be used in various medical situations.