Hesi BSN 215 RN Dosage Calculation
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Free Hesi BSN 215 RN Dosage Calculation Questions
A client with peptic ulcer disease receives a prescription for dicyclomine 20 mg PO four times daily. The medication is available in 10 mg tablets. How many tablets should the nurse administer in a 24-hour period
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4 tablets
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6 tablets
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8 tablets
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10 tablets
Explanation
Correct Answer C: 8 tablets
Explanation:
Each dose: 20 mg
Tablet strength: 10 mg
20 mg ÷ 10 mg/tablet = 2 tablets per dose
2 tablets × 4 doses per day = 8 tablets per 24-hour period
Why the Other Options Are Incorrect:
A. 4 tablets
Would deliver only one 10 mg tablet per dose—underdosing the patient.
B. 6 tablets
Would deliver 15 mg per dose—not matching the prescribed 20 mg.
D. 10 tablets
Would deliver 25 mg per dose—exceeding the prescribed daily dose.
The healthcare provider prescribed 2 liters of 5% dextrose in water (D5W) to infuse in 24 hours. The IV administration set delivers 15 gtt/mL. How many mL/hour should the nurse program the infusion pump
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75 mL/hr
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83 mL/hr
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100 mL/hr
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125 mL/hr
Explanation
Correct Answer B: 83 mL/hr
Explanation:
Convert the total volume from liters to milliliters:
2 liters = 2,000 mL
Then divide by the total infusion time:
2,000 mL ÷ 24 hr = 83.33 mL/hr, rounded to 83 mL/hr
Note: Since the nurse is using an infusion pump, the drop factor (15 gtt/mL) is not used in the calculation.
Why the Other Options Are Incorrect:
A. 75 mL/hr
This would only deliver 1,800 mL in 24 hours, which is less than prescribed.
C. 100 mL/hr
This would deliver 2,400 mL in 24 hours, exceeding the prescribed 2,000 mL.
D. 125 mL/hr
This rate would infuse 3,000 mL in 24 hours—50% more than ordered, which could lead to fluid overload.
The healthcare provider prescribes levothyroxine 1.6 mcg/kg/day PO for a client who weighs 242 pounds. The medication is available in 88 mcg tablets. How many tablets should the nurse administer
-
2 tablets
-
2.5 tablets
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3 tablets
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3.5 tablets
Explanation
Correct Answer A: 2 tablets
Explanation:
Step 1: Convert weight to kilograms
242 lb ÷ 2.2 = 110 kg
Step 2: Calculate total daily dose
1.6 mcg × 110 kg = 176 mcg/day
Step 3: Determine number of tablets
176 mcg ÷ 88 mcg/tablet = 2 tablets
Why the Other Options Are Incorrect:
B. 2.5 tablets
Delivers 220 mcg—more than prescribed.
C. 3 tablets
Delivers 264 mcg—significantly over the ordered dose.
D. 3.5 tablets
Delivers 308 mcg—nearly double the correct amount.
The healthcare provider prescribes interferon beta-1b 0.25 mg SUBQ every other day for a client with multiple sclerosis. The nurse reconstitutes the single-use vial of powder labeled, "0.3 mg with 1.2 mL of sterile water." How many mL should the nurse administer to the client
-
0.8 mL
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0.9 mL
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1.0 mL
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1.1 mL
Explanation
Correct Answer C: 1.0 mL
Explanation:
The concentration after reconstitution is:
0.3 mg in 1.2 mL
To determine how many mL provide 0.25 mg:
Set up a proportion:
(0.25 mg × 1.2 mL) ÷ 0.3 mg = 1.0 mL
Why the Other Options Are Incorrect:
A. 0.8 mL
Delivers only 0.2 mg—less than the prescribed dose.
B. 0.9 mL
Delivers 0.225 mg—still too little.
D. 1.1 mL
Delivers 0.275 mg—more than prescribed.
The healthcare provider prescribes regular insulin 10 units/hour IV. The pharmacy provides a solution of normal saline 250 mL with 125 units regular insulin. How many hours should the IV infuse
-
10 hours
-
12 hours
-
13 hours
-
15 hours
Explanation
Correct Answer C: 13 hours
Explanation:
Total insulin in the IV bag = 125 units
Prescribed infusion rate = 10 units/hour
125 units ÷ 10 units/hour = 12.5 hours, rounded to the nearest whole number = 13 hours
Why the Other Options Are Incorrect:
A. 10 hours
Would deliver only 100 units, leaving 25 units remaining and stopping the infusion too early.
B. 12 hours
Would deliver 120 units, not using the entire 125-unit dose.
D. 15 hours
Would require a slower rate (around 8.3 units/hour), which does not meet the prescribed 10 units/hour.
A client with a renal calculi receives a prescription for an IV infusion of 0.9% sodium chloride 1,000 mL to be infused over 2.5 hours. The nurse should program the infusion pump to deliver how many mL/hour
-
380 mL/hr
-
390 mL/hr
-
400 mL/hr
-
410 mL/hr
Explanation
Correct Answer C: 400 mL/hr
Explanation:
Use the formula:
Volume ÷ Time = mL/hour
1,000 mL ÷ 2.5 hours = 400 mL/hr
Why the Other Options Are Incorrect:
A. 380 mL/hr
Would deliver only 950 mL in 2.5 hours—less than prescribed.
B. 390 mL/hr
Delivers 975 mL in 2.5 hours—still under the required volume.
D. 410 mL/hr
Would deliver 1,025 mL—more than the ordered volume.
The nurse is reviewing instructions with a client who is to take 120 mL of a carbohydrate-balanced meal replacement four times a day, three hours postprandial. The client has a measuring cup marked in ounces. How many ounces should the client take for each dose
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3.5 oz
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4.0 oz
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4.1 oz
-
4.5 oz
Explanation
Correct Answer C: 4.1 oz
Explanation:
Step 1: Use the conversion factor
1 ounce = 29.5735 mL
Step 2: Convert 120 mL to ounces
120 mL ÷ 29.5735 = 4.06 oz, rounded to the nearest tenth = 4.1 oz
Why the Other Options Are Incorrect:
A. 3.5 oz
Equals only about 103.5 mL—less than the prescribed 120 mL.
B. 4.0 oz
Equals about 118.3 mL—slightly under the prescribed dose.
D. 4.5 oz
Equals about 133 mL—exceeds the prescribed volume.
The healthcare provider prescribes ganciclovir 375 mg IV every 12 hours to infuse over 90 minutes. The pharmacy delivers ganciclovir 375 mg in a 150 mL IV bag. How many drops/minute should the nurse regulate the gravity infusion using a drip chamber that delivers 10 drops/mL
-
15 gtt/min
-
17 gtt/min
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20 gtt/min
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25 gtt/min
Explanation
Correct Answer B: 17 gtt/min
Explanation:
Use the formula for gravity flow rate:
(Volume in mL × Drop factor) ÷ Time in minutes = gtt/min
(150 mL × 10 gtt/mL) ÷ 90 min =
1,500 ÷ 90 = 16.67, rounded to the nearest whole number = 17 gtt/min
Why the Other Options Are Incorrect:
A. 15 gtt/min
Would take 100 minutes to deliver the dose, which is longer than prescribed.
C. 20 gtt/min
Would complete the infusion in 75 minutes—too fast.
D. 25 gtt/min
Would complete the infusion in 60 minutes—much faster than ordered and could cause adverse effects.
The healthcare provider (HCP) prescribes lorazepam 50 mcg/kg IM two hours before a scheduled procedure for a client who weighs 74 kg. The medication is available as "Lorazepam 2 mg/mL vial." How many mL should the nurse administer
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1.7 mL
-
1.8 mL
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1.9 mL
-
2.0 mL
Explanation
Correct Answer C: 1.9 mL
Explanation:
The ordered dose is 50 mcg/kg × 74 kg = 3,700 mcg = 3.7 mg
Available concentration: 2 mg/mL
3.7 mg ÷ 2 mg/mL = 1.85 mL, rounded to 1.9 mL
Why the Other Options Are Incorrect:
A. 1.7 mL
Delivers only 3.4 mg, underdosing the client by 0.3 mg.
B. 1.8 mL
Delivers 3.6 mg, still slightly below the required 3.7 mg dose.
D. 2.0 mL
Delivers 4.0 mg, exceeding the prescribed dose and may cause excessive sedation.
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
-
170 mg
-
180 mg
-
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.
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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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