Total BODY WATER, Approx. 60% Body weight, Varies with age, gender and body habitus, Body Water Compartments, Intracellular volume : 2/3 of TBW, Extracellular volume : 1/3 of TBW, Intravascular : Plasma volume (1/4), Extravascular: Interstitial fluid and others(3/4), Intravenous Fluids Therapy, Indications: Volume resuscitation, Vehicle for i/v drugs, Types: Crystalloids, Colloids