What is the concentration of Normal Saline?

Normal Saline is a solution consisting of sodium chloride (NaCl) dissolved in sterile water to be used as a sterile IV solution or for various medical purposes. The standard concentration for Normal Saline is 0.9%, which means that there are 0.9 grams of sodium chloride per 100 milliliters of solution. This concentration closely matches the osmolarity of human blood, which makes it isotonic and safe for use in various medical situations, such as fluid replacement and diluting medications.

The other concentrations provided in the options differ from the traditional formulation of Normal Saline. For instance, 0.45% saline is considered half-normal saline and is used in specific medical scenarios requiring lower sodium concentrations. Similarly, 1.0% and 0.2% solutions do not represent standard saline solutions used in clinical settings. Therefore, understanding that Normal Saline is specifically defined by its 0.9% concentration is crucial in medical practice and patient care.