Saline (medicine)

In medicine, saline refers to any solution of salt in water; that is, salt water. Such solutions are sterile when they are to be placed into the body by infusion or injection. If the solution has more salt in it than is found in the human body, it is called "hypertonic saline". The normal salt level is 0.9% and any salt amount more than 0.9% is called hypertonic.