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Medical Math

Medical Math. Operations and Formulas. 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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Medical Math

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  1. Medical Math Operations and Formulas

  2. 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

  3. Household Abbreviation / Metric / Apothecary • 1 cup C 240 cc • 1 tablespoon T (tbs) 15 cc or 15 ml • 1 teaspoon t (tsp)   5 cc • drop gtt depends on size of the drop • pound lb 2.2 lb = 1 kg 1 lb. = 16 oz

  4. The formula method: D x Q = X H • D - dosage desired or orderedH - 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

  5. 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

  6. 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

  7. Temperature Conversion °C = (°F-32) 5/9 or 0.5556 °F = (°C) 9/5 or 1.8 + 32

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