Dosage Calculation Using Dimensional Analysis_Revised Spring 2017.docx

Advantages 1 fast simple organized system for setting

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Advantages 1. Fast, simple, organized system for setting up problem 2. Easy to understand, this standardized format can be used for any type of dosage calculation to enhance conceptual understanding. 1
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3. Identify incorrect setup before calculations carried out (accuracy & efficiency) 4. Factors must be labeled to use the DA method, resulting in a correctly labeled answer for administration, not just a numeric answer. 5. Immediately identify incorrect answer from incorrect setup 6. Once mastered, it can be easily applied to more complex dosage problems (titrations) 7. No formula needs to be memorized and the calculation results in a clearly labeled dose to be administered. 8. * Calculations, which normally require several steps, can be simplified into a single equation. The basic DA Equation In DA dosages or data (numbers or units) are called factors Entered together in the DA equation as a common fraction 1 1 tab 12 inches 1 foot 250 mg 0.5 g 1 foot 12 inches Top entries = numerators Bottom entries = denominators Question: An IM medication order is for 1500 mg, the solution strength available is 500 mg per mL . How many mL must you prepare to get this dosage? Steps Step 1 : Identify the unit of measure (drug form, or label) is needed to administer the medication as prescribed Parenteral dosages – always be mL Tab/cap – always be tab/cap Write the mL unit of measure being calculated to the left of the equation , followed by an equal (=) sign. mL = 2
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Step 2: Go back to the problem, and locate the factor which contains mL (provided by the dosage strength available : 500 mg = 1 mL). This will be your starting factor, and is entered with 1 ml as the numerator to match mL unit being calculated. mL = 1 mL The units of measure or label must be entered with each quantity 500 mg starting factor Step 3: Enter additional factors so that each successive numerator matches the unit of measure in the previous denominator mL = 1 mL x 1500 mg 500 mg Step 4 : Cancel the alternate denominator/numerator measurement units to be sure they match (this indicates factors were correctly entered in the equation).The mg are cancelled ( but not their quantities : 500 and 1500). This leaves only ml , the unit being calculated, remaining in the equation.
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