Patients in the hospital often have their I and O (Intake and Output) monitored. If a person puts out more fluid than is taken in that person is said to have a negative fluid balance. If the person takes in more than he puts out then he is said to have a positive fluid balance.
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Negative fluid balance means that a person is losing more fluids than they are taking in. If a person is diagnosed with this, they will be given intravenous fluids to keep them hydrated.