Hesi BSN 215 RN Dosage Calculation

Hesi BSN 215 RN Dosage Calculation

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Nervous about taking the Hesi BSN 215 RN Dosage Calculation test? Master it with our proven practice questions.

Free Hesi BSN 215 RN Dosage Calculation Questions

1.

 The nurse is preparing to administer a prescription for cefazolin 600 mg IM every six hours. The available vial is labeled, "Cefazolin 1 gram," and the instructions for reconstitution state, "For IM use add 2 mL sterile water for injection. Total volume after reconstitution equals 2.5 mL." When reconstituted, how many milligrams are in each mL of solution

  • 200 mg/mL

  • 300 mg/mL

  • 400 mg/mL

  • 600 mg/mL

Explanation

Correct Answer C: 400 mg/mL

Explanation:

Step 1: Convert 1 gram to milligrams

1 gram = 1,000 mg

Step 2: Divide by total volume after reconstitution

1,000 mg ÷ 2.5 mL = 400 mg/mL

Why the Other Options Are Incorrect:

A. 200 mg/mL

Would result if the total volume were 5 mL, not 2.5 mL.

B. 300 mg/mL

Incorrect division; would result from 1,000 mg in about 3.3 mL.

D. 600 mg/mL

Would mean 1,000 mg in only 1.67 mL—not the reconstituted volume given.


2.

A client receives a prescription for lactated Ringer's 2 liters IV to be infused over 20 hours. How many mL should the nurse program the infusion pump to deliver

  • 80 mL/hr

  • 90 mL/hr

  • 100 mL/hr

  • 120 mL/hr

Explanation

Correct Answer C: 100 mL/hr

Explanation:

Step 1: Convert liters to milliliters

2 liters = 2,000 mL

Step 2: Divide total volume by total time

2,000 mL ÷ 20 hr = 100 mL/hr

Why the Other Options Are Incorrect:

A. 80 mL/hr

Would deliver only 1,600 mL in 20 hours—less than prescribed.

B. 90 mL/hr

Would deliver 1,800 mL, still under the ordered volume.

D. 120 mL/hr

Would infuse 2,400 mL in 20 hours—more than prescribed, risking fluid overload.


3.

 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

  • 36 gtt/min

  • 38 gtt/min

  • 42 gtt/min

  • 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.


4.

  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

  • 1.7 mL

  • 1.8 mL

  • 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.


5.

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.


6.

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.


7.

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

  • 200 mL/hr

  • 225 mL/hr

  • 250 mL/hr

  • 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.


8.

The healthcare provider prescribes hydroxyzine 35 mg IM for a client who is vomiting. The available drug is labeled, "50 mg/mL." How many mL should the nurse administer

  • 0.5 mL

  • 0.6 mL

  • 0.7 mL

  • 0.8 mL

Explanation

Correct Answer C: 0.7 mL

Explanation:

Step 1: Use the formula:

Dose ordered ÷ Dose available = mL to administer

35 mg ÷ 50 mg/mL = 0.7 mL

Why the Other Options Are Incorrect:

A. 0.5 mL

Delivers only 25 mg—underdosing the client.

B. 0.6 mL

Delivers 30 mg—still less than prescribed.

D. 0.8 mL

Delivers 40 mg—exceeds the prescribed dose, which could cause sedation or side 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.

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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.