Fluid is essential to the survival of the human body.

Fluid is used in homeostasis of the body. Uses vary from helping to maintain the body temperature to ensuring the strict control of the electrolyte composition.

Fluid therapy can be considered in terms of maintenance and resuscitation.

In maintenance, we must replace the routine losses and also provide nutritional support.

In resuscitation, we must replace the fluid lost to restore an effective circulating volume.