Hesi BSN 215 RN Dosage Calculation
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Free Hesi BSN 215 RN Dosage Calculation Questions
The healthcare provider prescribes daptomycin 9 mg/kg/day IV for a child who weighs 44 pounds. How many mg of the medication should the nurse prepare to administer
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160 mg
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170 mg
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180 mg
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175 mg
Explanation
Correct Answer C: 180 mg
Explanation:
Step 1: Convert pounds to kilograms
44 lb ÷ 2.2 = 20 kg
Step 2: Multiply by the prescribed dose
9 mg × 20 kg = 180 mg
Why the Other Options Are Incorrect:
A. 160 mg
Would be correct for a 17.8 kg child—not the given 44 lb.
B. 170 mg
Underdoses the child by 10 mg.
D. 180 mg
This is the correct answer and is not incorrect.
A client is receiving an IV infusion of regular insulin 60 units in 100 mL normal saline at 5 units/hour. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
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8
Explanation
The bag concentration is 60 units ÷ 100 mL = 0.6 units/mL. To deliver 5 units/hour, divide the desired dose by the concentration: 5 units ÷ 0.6 units/mL = 8.33 mL/hour, which rounds to 8 mL/hour.
Correct Answer Is:
8
The healthcare provider prescribes magnesium sulfate 6 grams IV to be infused over 20 minutes for a client with preterm labor. The IV bag contains "Magnesium sulfate 20 grams in dextrose 5% in water 500 mL." How many mL/hour should the nurse set the infusion pump? (Enter numerical value only.)
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450
Explanation
The bag concentration is 20 grams per 500 mL, which equals 0.04 g/mL. To infuse 6 grams, the required volume is 6 g ÷ 0.04 g/mL = 150 mL. Since this volume must infuse over 20 minutes, convert to an hourly rate: 150 mL ÷ 20 minutes × 60 minutes/hour = 450 mL/hour.
Correct Answer Is:
450
The healthcare provider prescribes a secondary infusion of cefazolin 0.7 gram in 50 mL of D5W to infuse over 30 minutes. The drop factor is 10 gtt/mL. The nurse should regulate the IV to deliver how many drops/minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
-
17
Explanation
Using the formula (volume × drop factor) ÷ time in minutes: (50 mL × 10 gtt/mL) ÷ 30 minutes = 500 ÷ 30 = 16.67 gtt/minute, which rounds to 17 gtt/minute.
Correct Answer Is:
17
The healthcare provider prescribes enoxaparin 1 mg/kg SUBQ every 12 hours for a client who weighs 132 pounds. The medication is available in "Enoxaparin 60 mg/0.6 mL prefilled syringe." How many mL should the nurse administer per day? (Enter numerical value only.)
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1.2
Explanation
First convert the client's weight to kilograms: 132 lb ÷ 2.2 = 60 kg. The dose per administration is 60 kg × 1 mg/kg = 60 mg. The concentration is 60 mg/0.6 mL, which equals 100 mg/mL, so each dose requires 60 mg ÷ 100 mg/mL = 0.6 mL. Since the medication is given every 12 hours (twice daily), the total daily volume is 0.6 mL × 2 = 1.2 mL.
Correct Answer Is:
1.2
client receives a prescription for 1 liter of lactated Ringer's IV to be infused over 8 hours. The IV administration set delivers 20 gtt/mL. How many gtt/min should the nurse regulate the infusion
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36 gtt/min
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38 gtt/min
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42 gtt/min
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45 gtt/min
Explanation
Correct Answer C: 42 gtt/min
Explanation:
Step 1: Convert volume to mL
1 liter = 1,000 mL
Step 2: Convert time to minutes
8 hours × 60 = 480 minutes
Step 3: Apply the formula:
(Total volume × Drop factor) ÷ Time (minutes) = gtt/min
(1,000 mL × 20 gtt/mL) ÷ 480 minutes = 20,000 ÷ 480 = 41.67, rounded to 42 gtt/min
Why the Other Options Are Incorrect:
A. 36 gtt/min
Delivers only 864 mL in 8 hours—not the full liter ordered.
B. 38 gtt/min
Delivers approximately 912 mL in 8 hours—still underdosing.
D. 45 gtt/min
Delivers 1,080 mL—exceeds the prescribed volume, risking fluid overload.
A client is receiving a secondary infusion of azithromycin 500 mg in 500 mL of normal saline (NS) to be infused over 2 hours. How many mL/hour should the nurse program the infusion pump
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200 mL/hr
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225 mL/hr
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250 mL/hr
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275 mL/hr
Explanation
Correct Answer C: 250 mL/hr
Explanation:
To calculate the rate for infusion:
Total volume ÷ Time = mL/hour
500 mL ÷ 2 hours = 250 mL/hr
Why the Other Options Are Incorrect:
A. 200 mL/hr
Would take 2.5 hours to infuse—longer than prescribed.
B. 225 mL/hr
Would take about 2.2 hours—slower than prescribed.
D. 275 mL/hr
Would complete the infusion in under 2 hours—faster than ordered, possibly increasing risk of side effects.
A client with deep vein thrombosis (DVT) is receiving a continuous infusion of Heparin Sodium 25,000 Units in 5% Dextrose Injection 250 mL. The prescription indicates the dosage should be increased to 900 units/hour. The nurse should program the infusion pump to deliver how many mL/hour? (Enter numeric value only.)
-
9
Explanation
The bag concentration is 25,000 units ÷ 250 mL = 100 units/mL. To deliver 900 units/hour, divide the desired dose by the concentration: 900 units ÷ 100 units/mL = 9 mL/hour.
Correct Answer Is:
9
The label on a 2 gram vial of cefotaxime sodium powder for reconstitution reads, "Reconstitute with 50 mL of normal saline." After reconstitution with the 50 mL of normal saline, how many mg will each mL contain
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20 mg/mL
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25 mg/mL
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40 mg/mL
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50 mg/mL
Explanation
Correct Answer C: 40 mg/mL
Explanation:
First, convert grams to milligrams:
2 grams = 2,000 mg
Now divide the total drug amount by the total volume:
2,000 mg ÷ 50 mL = 40 mg/mL
Why the Other Options Are Incorrect:
A. 20 mg/mL
This would require 2,000 mg to be dissolved in 100 mL, not 50 mL.
B. 25 mg/mL
This would only be correct if 2,000 mg were reconstituted with 80 mL of fluid.
D. 50 mg/mL
This would result if the drug was reconstituted with only 40 mL of solution, not 50 mL.
The healthcare provider prescribes 0.9% normal saline intravenous (IV) to infuse at a keep-open rate of 70 mL per hour. The drop factor is 15 drops per mL. The nurse should regulate the infusion to administer how many drops per minute
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16 gtt/min
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18 gtt/min
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20 gtt/min
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22 gtt/min
Explanation
Correct Answer B: 18 gtt/min
Explanation:
70 mL/hr × 15 gtt/mL = 1,050 drops/hr
1,050 ÷ 60 = 17.5 gtt/min, rounded to 18 gtt/min
Why the Other Options Are Incorrect:
A. 16 gtt/min
Would deliver only 64 mL/hr—less than the prescribed rate.
C. 20 gtt/min
Would deliver 80 mL/hr—faster than ordered.
D. 22 gtt/min
Would infuse 88 mL/hr—too fast for a keep-open rate.
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Frequently Asked Question
This prep package offers over 100 exam-style dosage calculation questions closely modeled on the Hesi BSN 215 RN Dosage Calculation exam. The questions cover a wide range of clinical scenarios, including IV infusions, medication dosages based on weight, reconstitution of powders, and infusion rates. Each question is paired with expert explanations that clarify why each answer is correct or incorrect.
There are 55 detailed dosage calculation questions available, with the full package including over 100 questions in total, all designed to sharpen your calculation skills and clinical reasoning.
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Absolutely. The clear explanations and practical questions are designed to help both new and experienced nursing students gain confidence and mastery over dosage calculations.