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Saline or saline solution refers to a solution of sodium chloride (NaCl - i.e. common salt) and water. It is commonly used in medicine for intravenous infusion (in which case it must be sterile), rinsing contact lenses, nasal irrigation and as a cleaning agent. It is also made use of in various areas of science, espescially molecular biology. A solution of saline generally comes in varying concentrations, varying from low to normal to highconcentration. High concentrations are rarely used in medicine but commonly required in molecular biology.
Normal saline (NS) refers to a solution of 0.91% NaCl and is the concentration commonly used in intravenous drips, as its osmolarity is a close approximation of that of the NaCl found in blood.

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