Nursing Math.docx - 1 liter 1 gram 1 milligram 1 kilogram 1 liter 1000 milliliters 1000 milligrams(mg 1000 micrograms(mcg 2.2 pounds(lbs 2.2 pounds(lbs

# Nursing Math.docx - 1 liter 1 gram 1 milligram 1 kilogram 1...

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NU 254 Professional Nursing II Nursing Math Study Packet Common Conversions: 1 1 liter 1000 milliliters 1 gram 1000 milligrams (mg) 1 milligram 1000 micrograms (mcg) 1 kilogram 2.2 pounds (lbs) 1 liter 2.2 pounds (lbs) A. Ratio-Proportion Calculation To calculate Step 1: Determine what is on hand – 0.625 mg per tablet Step 2: MD order – 1.25 mg Step 3: Calculate: (0.625 mg/1 tablet = 1.25 mg/x tablets) = 2 tablets To calculate Step 1: Determine what is on hand – 500 mg tablets Step 2: MD order – 0.5 g Step 3: Convert grams to mg (1 gram/1000 mg = 0.5 gram/x mg) = 500 mg Step 4: Calculate: (500 mg/1 tablet = 500 mg/x tablets) = 1 tablet B. Calculating the amount of medication to be administered from a vial To calculate: Step 1: Determine what is on hand – 10 mg/2ml Step 2: MD order – 5 mg Step 3: Calculate: 10 mg/2ml = 5 mg/x ml = 1 ml To calculate: Step 1: Determine what is on hand: 0.4 mg/1ml Step 2: MD order – 125 mcg 2 Problem: The cardiac patient is to receive Cardizem 5 mg IVP. The vial contains 10 mg/2 ml. How many ml will you give? Problem: Digoxin 125 mcg is ordered IVP every am. The vial contains Atropine 0.4 mg in 1 ml. How much will you administer? Problem: Patient is to receive Premarin 1.25 mg po daily. Supply is 0.625 mg tablets. How many will you give? Problem: Patient is to receive Cefadroxil 0.5 g po bid. Supply is 500 mg tablets. How many will you give? Step 3: Convert 125 mcg to mg 125 mcg/ x mg = 1,000 mcg/1 mg = 0.125 mg Step 4: Calculate : 0.4 mg/1 ml = 0.125 mg/x ml = 0.3 ml B. Calculating Flow Rate (Also called infusion rates) (ml/hr) To calculate Step 1: Convert 1 gram to mg = 1,000 mg Step 2: Calculate: 1000 mg/500 ml = 20 mg/x ml = 10 ml/hr To calculate: Step 1: Convert 1 g to mg = 1,000 mg Step 2: Calculate: 1000 mg/500 ml = 3 mg/x ml = 1.5 ml/min Step 3: Calculate for ml/hr: 1.5 ml/min x 60 = 90 ml/hr C. Calculating mcg/kg/min To calculate: Step 1: Convert 1 mg/1000 mg = 250 mg/x mcg = 250,000 mcg Step 2: Calculate: 6 mcg/80/kg/60 min = 28,800 mcg/hr Step 3: Calculate: 250,000 mcg/250 ml = 28,000 mcg/x ml = 28 ml/hr To Calculate:  • • • 