Administration of a small volume of intravenous solution, connected to and hung higher than a primary intravenous solution.

Solution that has the same concentration of solutes as human blood.

Intravenous solutions are less concentrated than blood and other body fluids. These solutions are used to treat a fluid and electrolyte imbalance by moving water into the cells.

Intravenous solutions are more concentrated than body fluids. They pull fluid from the interstitial spaces and cells into the veins.