Hesi BSN 215 RN Dosage Calculation
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Free Hesi BSN 215 RN Dosage Calculation Questions
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
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2 tablets
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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.
A continuous infusion of heparin 10 units/kg/hour is prescribed for a client with deep vein thrombosis (DVT) who weighs 165 pounds. The IV bag is labeled Heparin Sodium 25,000 units in 5% Dextrose Injection 500 mL. The nurse should program the infusion pump to deliver how many mL/hour
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12 mL/hr
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18 mL/hr
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15 mL/hr
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20 mL/hr
Explanation
Correct Answer C: 15 mL/hr
Let’s calculate it step by step:
Step 1: Convert weight to kilograms
165 lb ÷ 2.2 = 75 kg
Step 2: Calculate prescribed dose
10 units/kg/hour × 75 kg = 750 units/hour
Step 3: Determine the concentration of the IV solution
25,000 units ÷ 500 mL = 50 units/mL
Step 4: Calculate mL/hour to deliver 750 units/hour
750 units ÷ 50 units/mL = 15 mL/hour
Why the Other Options Are Incorrect:
A. 12 mL/hr
Delivers only 600 units/hr—underdosing the client.
B. 18 mL/hr
This is the correct dose and is not incorrect.
D. 20 mL/hr
Delivers 1,000 units/hr—exceeds the prescribed 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
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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 nurse is initiating a 500 mL IV of normal saline at 60 mL/hour for a client with heart failure. How many hours should the IV infuse
-
7.5 hours
-
8.0 hours
-
8.3 hours
-
8.5 hours
Explanation
Correct Answer C: 8.3 hours
Explanation:
To calculate infusion time:
Total Volume ÷ Rate = Time
500 mL ÷ 60 mL/hr = 8.33 hours, rounded to the nearest tenth = 8.3 hours
Why the Other Options Are Incorrect:
A. 7.5 hours
Would deliver only 450 mL—less than the full ordered volume.
B. 8.0 hours
Would deliver 480 mL—not quite enough for the full order.
D. 8.5 hours
Would overextend the infusion and deliver too slowly.
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
-
75 mL/hr
-
83 mL/hr
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100 mL/hr
-
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 nurse is preparing a change of shift report for a client who has an IV infusion of 1000 mL of 0.9% sodium chloride. The infusion was started 5 hours ago at a rate of 125 mL/hour via an infusion pump. The nurse should report how many mL remain to be infused to the oncoming nurse
-
325 mL
-
375 mL
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425 mL
-
500 mL
Explanation
Correct Answer B: 375 mL
Explanation:
Step 1: Calculate how much has infused so far
125 mL/hour × 5 hours = 625 mL infused
Step 2: Subtract from the total volume
1,000 mL − 625 mL = 375 mL remaining
Why the Other Options Are Incorrect:
A. 325 mL
This would be correct only if 675 mL had infused, which overstates the actual volume.
C. 425 mL
This implies only 575 mL infused, which is less than what has been delivered in 5 hours.
D. 500 mL
Suggests exactly half the fluid remains, which would only be true after 4 hours—not 5.
A child with a seizure disorder receives a prescription for phenytoin 20 mg by mouth (PO) every 8 hours. The suspension is available in 125 mg/5 mL. How many mL should the nurse administer
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0.6 mL
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0.8 mL
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1.0 mL
-
1.2 mL
Explanation
Correct Answer B: 0.8 mL
Explanation:
To find how many mL are needed for a 20 mg dose when the concentration is 125 mg per 5 mL:
Set up the proportion:
125 mg : 5 mL = 20 mg : x mL
x = (20 × 5) ÷ 125 = 100 ÷ 125 = 0.8 mL
Why the Other Options Are Incorrect:
A. 0.6 mL
Delivers only 15 mg—less than the prescribed dose.
C. 1.0 mL
Delivers 25 mg—over the prescribed 20 mg dose.
D. 1.2 mL
Delivers 30 mg—50% higher than ordered, which may cause adverse effects.
The healthcare provider prescribes the standard heparin protocol for a client who weighs 95 kg and is diagnosed with a deep vein thrombosis. The loading dose is an IV bolus of 80 units/kg. Heparin is available in vials of 5,000 units/mL. How many mL of heparin should the nurse administer
-
1.2 mL
-
1.4 mL
-
1.5 mL
-
1.6 mL
Explanation
Correct Answer C: 1.5 mL
Explanation:
Step 1: Calculate the total units needed
80 units/kg × 95 kg = 7,600 units
Step 2: Determine mL to administer using the available concentration
7,600 units ÷ 5,000 units/mL = 1.52 mL, rounded to the nearest tenth = 1.5 mL
Why the Other Options Are Incorrect:
A. 1.2 mL
Delivers only 6,000 units—underdosing the client.
B. 1.4 mL
Delivers 7,000 units—still short of the prescribed dose.
D. 1.6 mL
Delivers 8,000 units—exceeds the ordered 7,600 units, risking over-anticoagulation.
The healthcare provider prescribes heparin 1,000 units subcutaneously twice a day. The available vial is labeled, "Heparin Sodium Injection 2,000 units/2 mL." How many mL should the nurse administer
-
0.5 mL
-
1 mL
-
1.5 mL
-
2 mL
Explanation
Correct Answer B: 1 mL
Explanation:
The vial contains 2,000 units in 2 mL, which means:
2,000 units ÷ 2 mL = 1,000 units per mL
The prescribed dose is 1,000 units, so:
1,000 units ÷ 1,000 units/mL = 1 mL
Why the Other Options Are Incorrect:
A. 0.5 mL
This would deliver only 500 units, which is half the prescribed dose.
C. 1.5 mL
This would provide 1,500 units, exceeding the ordered amount.
D. 2 mL
This would deliver 2,000 units—double the correct dose and potentially harmful.
The healthcare provider (HCP) prescribes erythromycin suspension 250 mg PO every 6 hours for a child with streptococcal pharyngitis. The drug is available in a suspension labeled, "200 mg/5 mL." How many mL should the nurse administer
-
5.75 mL
-
6.00 mL
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6.25 mL
-
6.50 mL
Explanation
Correct Answer C: 6.25 mL
Explanation:
Step 1: Use the formula:
(Dose ordered × Volume) ÷ Dose on hand = mL to administer
(250 mg × 5 mL) ÷ 200 mg =
1,250 ÷ 200 = 6.25 mL
Why the Other Options Are Incorrect:
A. 5.75 mL
Delivers 230 mg—less than prescribed.
B. 6.00 mL
Delivers 240 mg—still under the required 250 mg dose.
D. 6.50 mL
Delivers 260 mg—more than ordered, risking overtreatment.
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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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