Hesi BSN 215 RN Dosage Calculation
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Free Hesi BSN 215 RN Dosage Calculation Questions
A client is receiving phenytoin 0.2 gram PO twice daily. The medication is available in 100 mg capsules. How many capsules should the nurse administer
-
1 capsule
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2 capsules
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3 capsules
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4 capsules
Explanation
Correct Answer B: 2 capsules
Explanation:
Step 1: Convert grams to milligrams
0.2 gram = 200 mg
Step 2: Use the available strength to determine how many capsules are needed
200 mg ÷ 100 mg/capsule = 2 capsules
Why the Other Options Are Incorrect:
A. 1 capsule
Provides only 100 mg, which is half the prescribed dose.
C. 3 capsules
Provides 300 mg, exceeding the ordered amount.
D. 4 capsules
Delivers 400 mg, which is double the prescribed 200 mg dose and could cause toxicity.
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
-
12 mL/hr
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18 mL/hr
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15 mL/hr
-
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 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
-
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.
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.
At 1530 the nurse observes 550 mL of fluid is yet to be infused for a client receiving 1,000 mL dextrose 5% and 0.225% sodium chloride, USP at 88 mL/hour. At what time should the nurse calculate the fluid will be infused based on the 24-hour clock
-
2130
-
2200
-
2145
-
2230
Explanation
Correct Answer C: 2145
Explanation:
To determine the infusion completion time:
Volume ÷ Rate = Time
550 mL ÷ 88 mL/hr = 6.25 hours
0.25 hours × 60 = 15 minutes
6.25 hours = 6 hours and 15 minutes
1530 + 6 hours = 2130
2130 + 15 minutes = 2145
Why the Other Options Are Incorrect:
A. 2130
This accounts for only 6 hours of infusion time, missing the additional 15 minutes.
B. 2200
This would mean 6 hours and 30 minutes of infusion time, longer than actually required.
D. 2230
This would assume an infusion time of 7 hours, which is almost an hour longer than needed.
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
-
16 gtt/min
-
18 gtt/min
-
20 gtt/min
-
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.
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
-
0.6 mL
-
0.8 mL
-
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 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 dehydration is prescribed a potassium chloride infusion at 10 mEq/hr. Potassium chloride 80 mEq is mixed with 1 liter (1,000 mL) of normal saline. The nurse should regulate the infusion pump to deliver how many mL/hour
-
100 mL/hr
-
125 mL/hr
-
150 mL/hr
-
200 mL/hr
Explanation
Correct Answer B: 125 mL/hr
Explanation:
First, determine the concentration of potassium chloride in the IV bag:
80 mEq ÷ 1,000 mL = 0.08 mEq/mL
Now calculate how many mL will provide 10 mEq/hr:
10 mEq ÷ 0.08 mEq/mL = 125 mL/hr
Why the Other Options Are Incorrect:
A. 100 mL/hr
This would provide only 8 mEq/hr (0.08 × 100), which is less than prescribed.
C. 150 mL/hr
This would deliver 12 mEq/hr (0.08 × 150), exceeding the prescribed dose and potentially causing hyperkalemia.
D. 200 mL/hr
This would deliver 16 mEq/hr (0.08 × 200), which is far too much and could be dangerous for the patient.
The healthcare provider prescribes an IV solution of regular insulin 100 units in 250 mL of 0.45% saline to infuse at 12 units/hour. The nurse should program the infusion pump to deliver how many mL/hour
-
25 mL/hr
-
30 mL/hr
-
35 mL/hr
-
40 mL/hr
Explanation
Correct Answer B: 30 mL/hr
Explanation:
Step 1: Determine the concentration of insulin in the solution
100 units ÷ 250 mL = 0.4 units/mL
Step 2: Calculate the volume needed for 12 units/hour
12 units ÷ 0.4 units/mL = 30 mL/hour
Why the Other Options Are Incorrect:
A. 25 mL/hr
Delivers only 10 units/hour—underdosing the client.
C. 35 mL/hr
Delivers 14 units/hour—more than prescribed.
D. 40 mL/hr
Delivers 16 units/hour—significantly exceeds the ordered rate.
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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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