Fluid replacement or fluid resuscitation is the medical practice of replenishing bodily fluid lost through sweating, bleeding, fluid shifts or other pathologic processes.

● Repletion fluid therapy corrects water and acute electrolyte deficits that have accrued via illness or physiologic abnormality. Repletion returns the patient to a normal volume and electrolyte status.

Clinically, it is useful to divide fluid therapy into repletion therapy and maintenance therapy. ● Repletion therapy replaces any current existing water and electrolyte deficits, replaces any ongoing abnormal losses, and returns the patient to a normal volume and electrolyte status.