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**Operations and Formulas**

Medical Math Operations and Formulas

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**Metric Abbreviations for Weight**

Kilogram kg Gram gm Milligram mg Microgram mcg Metric Equivalencies for Weight 1 kilogram= 1000 g 1gram= 1000 mg 1 milligram= 1000 mcg

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**Household Abbreviation / Metric / Apothecary**

1 cup C cc 1 tablespoon T (tbs) cc or 15 ml 1 teaspoon t (tsp) cc drop gtt depends on size of the drop pound lb lb = 1 kg lb. = 16 oz

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The formula method: D x Q = X H D - dosage desired or ordered H - what is on hand (available) Q - unit of measure that contains the available dose. When using solid products (tablets, capsules) Q is always 1 and can be eliminated. Q varies when using liquid measures. X - the unknown dosage you need to administer

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Units Calculating dosages in units (insulin, heparin, pitocin, vitamins, some antibiotics) Example: Ordered: Heparin 8000 units subcutaneous q12h Available: Heparin 10,000 units per ml How much will you administer? Formula: 8000 units X 1 ml = 0.8 ml 10,000 units

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**Calculations based on body weight**

The first step is to convert the patient’s body weight into kg. The formula is 2.2 lb. = 1 kg. The second step is to calculate the medication dose. a. Calculate the daily dose b. Divide the daily dose by the number of doses to be administered. c. Use either the ratio-proportion or formula method to calculate the number of tablets/capsules or volume to be administered with each dose

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**Temperature Conversion**

°C = (°F-32) 5/9 or °F = (°C) 9/5 or

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