Administration of fluids by any route to correct fluid and electrolyte deficits. The deficit may be physiological, as in dehydration due to perspiring in a hot, dry climate during hard physical labor or sports, or due to inadequate intake of fluids. It may be pathological, as in traumatic or septic shock, acute respiratory distress syndrome, severe vomiting or diarrhea or both, or metabolic and endocrine conditions such as diabetic ketosis, chronic renal failure, and adrenal insufficiency.