Hesi BSN 215 RN Dosage Calculation

Hesi BSN 215 RN Dosage Calculation

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Free Hesi BSN 215 RN Dosage Calculation Questions

1.

 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

  • 0.9 mL

  • 1.0 mL

  • 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.


2.

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

  • 20 gtt/min

  • 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.


3.

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.


4.

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

  • 2 capsules

  • 3 capsules

  • 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.


5.

. A client who weighs 132 pounds receives a prescription for dalteparin 200 units/kg SUBQ once a day for a month. The medication is available in 25,000 units/mL vial. How many mL should the nurse administer

  • 0.4 mL

  • 0.5 mL

  • 0.6 mL

  • 0.8 mL

Explanation

Correct Answer B: 0.5 mL

Explanation:

132 lb ÷ 2.2 = 60 kg

200 units/kg × 60 kg = 12,000 units

12,000 units ÷ 25,000 units/mL = 0.48 mL

Rounded to the nearest tenth = 0.5 mL

Why the Other Options Are Incorrect:

A. 0.4 mL

Delivers only 10,000 units—under the prescribed dose.

C. 0.6 mL

Delivers 15,000 units—more than prescribed.

D. 0.8 mL

Delivers 20,000 units—far too much and could cause harm.


6.

 A child receives a prescription for loratadine 5 mg by mouth once a day. The bottle is labeled "Loratadine for Oral Suspension, USP 5 mg per 5 mL." How many teaspoons should the nurse instruct the parent to administer with each dose

  • 0.5 tsp

  • 1 tsp

  • 1.5 tsp

  • 2 tsp

Explanation

Correct Answer B: 1 tsp

Explanation:

The prescribed dose is 5 mg.

The concentration on the label is 5 mg per 5 mL.

So, the parent should give 5 mL to provide 5 mg.

Since 1 teaspoon = 5 mL, the correct dose is 1 tsp.

Why the Other Options Are Incorrect:

A. 0.5 tsp

This would provide only 2.5 mL, or 2.5 mg—half the prescribed dose.

C. 1.5 tsp

This equals 7.5 mL, or 7.5 mg—exceeding the ordered amount.

D. 2 tsp

This equals 10 mL, or 10 mg—double the prescribed dose, which could risk overdose.


7.

A client is receiving a secondary IV infusion of potassium chloride (KCl) 30 mEq at a rate of 10 mEq an hour. The pharmacy dispenses 100 mL of 0.9% normal saline (NS) containing KCl 30 mEq. The nurse should program the infusion pump to deliver how many mL/hour

  • 30 mL/hr

  • 33 mL/hr

  • 40 mL/hr

  • 50 mL/hr

Explanation

Correct Answer B: 33 mL/hr

Explanation:

To deliver 10 mEq/hr from a solution that contains 30 mEq in 100 mL:

(10 mEq ÷ 30 mEq) × 100 mL = 33.3 mL/hr, rounded to 33 mL/hr

Why the Other Options Are Incorrect:

A. 30 mL/hr

Delivers only 9 mEq/hr—slightly under the prescribed rate.

C. 40 mL/hr

Would deliver 12 mEq/hr, which exceeds the safe ordered rate.

D. 50 mL/hr

Would deliver 15 mEq/hr, risking hyperkalemia due to rapid infusion.


8.

The healthcare provider prescribes daptomycin 9 mg/kg/day IV for a child who weighs 44 pounds. A 200 mL bag of 5% Dextrose Injection containing the prescribed dose is delivered to the unit. How many mL/hour should the nurse program the infusion pump

  • 100 mL/hr

  • 150 mL/hr

  • 200 mL/hr

  • 250 mL/hr

Explanation

Correct Answer C: 200 mL/hr

Explanation:

Step 1: Convert weight to kilograms

44 lb ÷ 2.2 = 20 kg

Step 2: Calculate the dose

9 mg × 20 kg = 180 mg

Step 3: The pharmacy has already prepared the correct dose (180 mg) in a 200 mL bag. Since the medication is to infuse over 1 hour:

200 mL ÷ 1 hr = 200 mL/hr

Why the Other Options Are Incorrect:

A. 100 mL/hr

Would take 2 hours to infuse the medication—longer than the ordered time.

B. 150 mL/hr

Would complete the infusion in approximately 80 minutes—not within the prescribed 1 hour.

D. 250 mL/hr

Would complete the infusion in 48 minutes—too fast and may increase the risk of adverse effects.


9.

 A client is receiving a 200 mL bolus of 0.9% sodium chloride to be infused over 20 minutes. The nurse should set the infusion pump to deliver how many mL/hour

  • 400 mL/hr

  • 500 mL/hr

  • 600 mL/hr

  • 700 mL/hr

Explanation

Correct Answer C: 600 mL/hr

Explanation:

Step 1: Convert 20 minutes to hours

20 ÷ 60 = 0.33 hours

Step 2: Use the formula:

Volume ÷ Time = Rate (mL/hr)

200 mL ÷ 0.33 hr ≈ 606.06, rounded to the nearest whole number = 600 mL/hr

Why the Other Options Are Incorrect:

A. 400 mL/hr

Would take 30 minutes to infuse—too slow.

B. 500 mL/hr

Would take 24 minutes to infuse—still too slow.

D. 700 mL/hr

Would complete the bolus in about 17 minutes—too fast.


10.

The healthcare provider prescribes magnesium sulfate 300 mg/hour IV. The IV bag contains magnesium sulfate 4 grams in dextrose 5% in water (D5W) 500 mL. How many mL/hour should the nurse set the infusion pump

  • 30.0 mL/hr

  • 35.5 mL/hr

  • 37.5 mL/hr

  • 40.0 mL/hr

Explanation

Correct Answer C: 37.5 mL/hr

Explanation:

Step 1: Convert grams to milligrams

4 grams = 4,000 mg

Step 2: Determine concentration in mg/mL

4,000 mg ÷ 500 mL = 8 mg/mL

Step 3: Calculate mL/hr for 300 mg/hr dose

300 mg ÷ 8 mg/mL = 37.5 mL/hr

Why the Other Options Are Incorrect:

A. 30.0 mL/hr

Delivers only 240 mg/hr (8 × 30), which is less than the prescribed 300 mg/hr.

B. 35.5 mL/hr

Delivers 284 mg/hr (8 × 35.5), still short of the required dose.

D. 40.0 mL/hr

Delivers 320 mg/hr (8 × 40), which exceeds the prescribed 300 mg/hr.


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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.

Access is priced at $30 for a 30-day unlimited access subscription.

You will have unlimited access for 30 days from your purchase date, allowing you to practice, review, and retake questions as often as you like during that time.

Yes. Every question includes detailed explanations for both correct and incorrect answers to help you understand dosage calculation principles clearly and improve accuracy.

Yes. The ULOSCA platform is fully optimized for mobile devices, tablets, and desktop use, so you can study conveniently wherever you are.

No downloads or installations are required. All questions and explanations are accessible online through your secure ULOSCA account.

Absolutely. The clear explanations and practical questions are designed to help both new and experienced nursing students gain confidence and mastery over dosage calculations.