Which IV solution is often used for rehydrating patients?

Normal saline is a commonly used intravenous solution for rehydrating patients because it closely resembles the electrolyte composition of blood plasma. It contains 0.9% sodium chloride (NaCl), which helps restore fluid balance and provides essential electrolytes when patients are dehydrated. This solution is particularly effective in situations where patients have lost fluids due to medical conditions such as vomiting, diarrhea, or excessive sweating.

In medical practice, normal saline is often the first choice for fluid resuscitation because it can quickly help to expand intravascular volume, normalize blood pressure, and improve perfusion to vital organs. Its isotonic nature ensures that it does not cause significant shifts in fluid between the extracellular and intracellular compartments, making it a safe option for rehydration.

In contrast, other solutions listed have different specific uses and are not intended for primary rehydration. Dextrose 50% is a concentrated sugar solution used primarily to provide energy and treat hypoglycemia rather than to rehydrate. 5% Sodium Bicarbonate is typically used to correct metabolic acidosis, not for rehydration. Colloids, while useful for expanding plasma volume in certain situations, are also used primarily in cases where it's critical to maintain oncotic pressure, rather