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Define isotonic, hypotonic, and hypertonic IV solutions and give one clinical use for each.

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Isotonic has osmolality similar to plasma (e.g., 0.9% NS) used for fluid resuscitation; hypotonic has lower osmolality (e.g., 0.45% NS) used to rehydrate cells; hypertonic has higher osmolality (e.g., 3% NS) used to reduce cellular edema or correct severe hyponatremia.

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