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Calculations

Author(s):  Prince Shelly J

Issue:  Jul/Aug 2001 - Sterile Product Compounding
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Abstract:  The author shows the reader how to perform calculations for five problems. The first involves a hyperalimentation solution. The reader is shown how to calculate the volume of each ingredient needed to prepare the solution. In the second, the reader is shown how to calculate the osmolarity of a 10% dextrose with 0.45% sodium chloride solution. The third involves a formulation for an isotonic solution for ophthalmic use. The reader is shown how to calculate the quantity of each ingredient that should be used to fill this prescription, the quantity of glycerin that should be used to prepare the solution and the quantity of one ingredient that would be needed to prepare the mixture. The fourth involves an order for Nafcillin sodium 800 mg in 100 mL NS. The reader is shown how to calculate the quantity of an ingredient solution that has been reconstituted with a different percentage of sterile water than was called for. In the fifth, the reader is shown how to calculate the quantity of potassium chloride that should be added to a patient’s intravenous fluid to achieve a specified concentration.

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