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Calculating mL/hr RATE from DOSAGE ORDERED BCTC Nursing Student Resource Center Renee Felts, RN

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Method #1 D/H x Q = amount Morphine sulfate to infuse at 8 mg/hour Available in 25 mg/ 50 mL 8 mg x 50 mL = 16 mL/hr 25 mg Morphine sulfate to infuse at 8 mg/hour Available in 25 mg/ 50 mL 8 mg x 50 mL = 16 mL/hr 25 mg

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Method # 2 Ratio/Proportion Same problem:Morphine 8 mg/hr A: 25 mg/50 mL 25 mg = 8 mg 400 = 16 mL 50 mL x mL 25x Same problem:Morphine 8 mg/hr A: 25 mg/50 mL 25 mg = 8 mg 400 = 16 mL 50 mL x mL 25x

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Method #1 Calculating mL/hr using mcg/min Order: Levophed 3 mcg/min Available: 8 mg/ 250 mL First, calculate dose per hour... 3 mcg/min x 60 min = 180 mcg/hr Order: Levophed 3 mcg/min Available: 8 mg/ 250 mL First, calculate dose per hour... 3 mcg/min x 60 min = 180 mcg/hr

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Convert 180 mcg to mg (compare apples to apples) 180 mcg = _____mg REMEMBER:small to LARGE = DIVIDE 180/1000 = 0.18 mg (compare apples to apples) 180 mcg = _____mg REMEMBER:small to LARGE = DIVIDE 180/1000 = 0.18 mg

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Use the solution strength to calculate the mL/hr rate. 8 mg = 0.18 mg = 45 = 5.6 mL 250 mL x mL 8x or 6 mL Levophed infusing at 3 mcg/min will infuse at 6 mL/hr at this strength (concentration) 8 mg = 0.18 mg = 45 = 5.6 mL 250 mL x mL 8x or 6 mL Levophed infusing at 3 mcg/min will infuse at 6 mL/hr at this strength (concentration)

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Method # 3 Calculate concentration: 8 mg = 8000 mcg 8000 mcg= 32 mcg/ mL 250 mL Formula: Dose x 60 (min in hr) / total volume 3 mcg/min x 60 = 5.6 mL or 6 mL/hr 32 mcg/mL Calculate concentration: 8 mg = 8000 mcg 8000 mcg= 32 mcg/ mL 250 mL Formula: Dose x 60 (min in hr) / total volume 3 mcg/min x 60 = 5.6 mL or 6 mL/hr 32 mcg/mL

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DOL disclaimer This workforce solution was funded by a grant awarded under the President’s Community-Based Job Training Grants as implemented by the U.S. Department of Labor’s Employment and Training Administration. The solution was created by the grantee and does not necessarily reflect the official position of the U.S. Department of Labor. The Department of Labor makes no guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or its completeness, timeliness, usefulness, adequacy, continued availability, or ownership. This solution is copyrighted by the institution that created it. Internal use by an organization and/or personal use by an individual for non-commercial purposes is permissible. All other uses require the prior authorization of the copyright owner.

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