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HESI Dosage Calculations Practice Exam
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1. A client with cardiogenic shock weighs 220 lb and is receiving dopamine at the rate of 3
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mcg/kg/minute.The solution strength available is dopamine 400 mg in 250 ml of D5W.The
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g nurse should set the infusion pump to deliver how many ml/hour? (Enter numeric value o
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nly. If rounding is required, round to the nearest tenth.)
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Answer 11.3 g




First, convert pounds to kg, 220 lb
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X = 2.2 lb 1 kg = 100 kg. Next, calculate the dosage per minute, 3 mcg/kg/min x 100 kg = 30
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0 mcg/min. Convert mcg/min
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to mcg/hour, 300 mcg/min x 60 min=18,000 mcg/hour. Convert mcg/hr to mg/hour, 18,000
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mcg/hr = 18.0 mg/hour. Calculate the rate, 400 mg 250 ml = 18 mg X
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ml 400X = 4500 X = 11.25 = 11.3 ml. So, 18 mg/11.3 ml should be infused at 11.3 ml/hour.
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2. A client with hypertension who weighs 72.4 kg is receiving an infusion of nitropruss
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ide (Nipride) 50 mg in D5W 250 ml at 75 ml/hour. How many
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,mcg/kg/minute is the client receiving? (Enter numeric value only. If rounding is required, r
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ound to the nearest tenth.)
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Answer 3.5 g




Calculate the mg/hour infusing, 50 mg 250 ml = X 75 ml 250X = 3750 and X = 15 mg/hour. Nex
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t, convert mg/hr to mcg/hour, 15 mg/hour = 1 mg / 1000 mcg = 15,000 mcg/hour, then divide
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by 60 min = 250 mcg/minute. Lastly, 250 mcg/72.4 kg/min =
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3.45 = 3.5 mcg/kg/minute.
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3. A client who weighs 70 kg is receiving a dopamine solution of 800 mg/500 ml normal sa
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line at 5 ml/hour. How many mcg/kg/minute is the client receiv-
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g ing? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
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Answer 1.9 g




To change ml/hour to mcg/kg/minute, use the formula desired rate (5 ml/hour) / volume
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available (500 ml) x dose available (800 mg) = 8 mg/hour. Next, convert milligrams/hour t
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o mcg/kg/minute mg (8) x 1000 / kg (70) / 60 minutes = 1.904 =
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1.9 mcg/kg/minute.
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4. A client is receiving an IV solution of sodium chloride 0.9% (Normal Saline) 250 ml with a
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miodarone (Cordarone) 1 gram at 17 ml/hour. How many mg/minute of amiodarone is infu
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,sing? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
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Answer Convert grams to mg, 1 gram equals 1,000 mg. Using ratio and proportion -
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g 1,000 mg 250 ml X mg 1ml 250X= 1,000 so X
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= 4 mg/ml is the solution concentration of amiodarone. The infusion rate (ml/hour) x concent
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ration (mg/ml) divided by 60 minutes/hour 17 ml/hour x 4 mg/ml = 68/60 =
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1.13 = 1.1 mg/minute.
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3g/g34

, 5. A client who weighs 176 pounds is receiving an IV infusion with esmolol hydrochloride
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g (Brevibloc) at 48 ml/hour.The IV solution is labeled with the concentration of Brevibloc
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10 mg/ml. How many mcg/kg/minute is the client receiving? (Enter numeric value only.)
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Answer 100 g




Convert pounds to kg by dividing 176 pounds by 2.2 pounds = 80 kg. Convert the IV concentr
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ation from mg to mcg. 1 mg 1000 mcg 10 mg 10,000 mcg. Infusion rate (48 ml/hour) x conce
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ntration (10,000 mcg/ml) divided by 60 minutes/hour x 80
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kg = 48 x 10,000 divided by 60 x 80 = 480, = 100 mcg/kg/minute.
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6. The nurse is preparing the change-of-
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shift report for a client who has a 265 ml secondary infusion that was started 2 hours ago at
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g a rate of 85 ml/hour via an infusion pump.The nurse should report that how many ml rema
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in to be infused by the on-coming nurse? (Enter numeric value only.)
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Answer 95 g




85 ml x 2 hours = 170 ml has infused. 265 ml (total amount to be infused) -
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g 170 ml (amount infused) = 95 ml remain to be infused.
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7. A male client receives a prescription for ondansetron hydrochloride (Zofran) 4 mg IV to pr
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event postoperative nausea after an inguinal hernia repair.The medication is available in 2
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