ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
The healthcare provider prescribes furosemide (Lasix) 25 mg IV. The drug is available in a solution of 40 mg/4ml. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
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2.0 mL
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2.5 mL
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3.0 mL
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3.5 mL
Explanation
Correct Answer:
B. 2.5 mL
Explanation of Correct Answer:
The concentration of furosemide is 40 mg in 4 mL.
To find the volume required for a 25 mg dose, use a proportion:
40 mg / 4 mL = 25 mg / x mL
Now, solve for x:
x = (25 mg × 4 mL) / 40 mg
x = 100 / 40
x = 2.5 mL
Why the Other Options are Incorrect:
A. 2.0 mL is incorrect because it would provide only 20 mg, which is less than the prescribed 25 mg.
C. 3.0 mL is incorrect because it would provide 30 mg, which is more than the prescribed 25 mg.
D. 3.5 mL is incorrect because it overestimates the required volume.
Summary:
The nurse should administer 2.5 mL of furosemide to provide the prescribed 25 mg dose. The correct answer is B. 2.5 mL.
A nurse is preparing to administer 0.9% sodium chloride 100 mL IV to infuse over 15 min. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
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300 mL/hr
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350 mL/hr
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400 mL/hr
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450 mL/hr
Explanation
Correct answer: C. 400 mL/hr
Detailed explanation of the correct answer:
Step 1: Use the IV rate formula to calculate mL/hr for an infusion:
Volume to infuse ÷ Time (in hours) = mL/hr
Convert 15 minutes to hours:
15 ÷ 60 = 0.25 hours
Step 2: Calculate the rate:
100 mL ÷ 0.25 hr = 400 mL/hr
Explanation of why the other options are incorrect:
A. 300 mL/hr is incorrect because it does not accurately account for the time factor and would deliver too little fluid.
B. 350 mL/hr is incorrect because it underestimates the required rate.
D. 450 mL/hr is incorrect because it overestimates the required rate.
Summary:
The nurse should set the IV pump to deliver 400 mL/hr.
A nurse is preparing to administer bumetanide 0.5 mg IV to a client who is experiencing heart failure. Available is bumetanide injection 0.25 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
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1 mL
-
2 mL
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0.5 mL
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4 mL
Explanation
Correct answer: B. 2 mL
Explanation of the correct answer (B):
The nurse is asked to administer 0.5 mg of bumetanide IV. The concentration available is 0.25 mg/mL. To determine the volume to administer, apply the formula:
Volume to administer (mL) = Dose prescribed (mg) ÷ Concentration available (mg/mL)
Given:
Dose prescribed = 0.5 mg
Concentration available = 0.25 mg/mL
Now, applying the formula:
Volume to administer = 0.5 mg ÷ 0.25 mg/mL = 2 mL
So, the nurse should administer 2 mL of bumetanide.
Therefore, the correct answer is B. 2 mL, because this amount contains the exact dose of 0.5 mg required.
Explanation of the incorrect options:
A. 1 mL – Incorrect. 1 mL of the solution only delivers 0.25 mg of bumetanide, which is half the required dose.
C. 0.5 mL – Incorrect. 0.5 mL delivers just 0.125 mg (0.25 mg/mL × 0.5 mL), which is significantly below the prescribed dose of 0.5 mg.
D. 4 mL – Incorrect. 4 mL of the solution would deliver 1 mg of bumetanide (0.25 mg/mL × 4 mL), which is double the prescribed dose and would result in overdosing the client.
Summary:
The prescribed dose is 0.5 mg, and the available concentration is 0.25 mg/mL. Using the formula to calculate volume, the nurse should administer 2 mL, making B the correct answer. The other options would result in underdosing or overdosing.
The healthcare provider prescribes thiamine HCL 0.03 grams IM TID for a client with beriberi. Thiamine is available for injection 100 mg/ml. The nurse should prepare to administer how many ml? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
-
0.3 ml
-
0.4 ml
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0.5 ml
-
0.6 ml
Explanation
Correct Answer:
A. 0.3 ml
Explanation of Correct Answer:
First, convert 0.03 grams to milligrams:
0.03 grams = 30 mg.
The thiamine available for injection is 100 mg/ml. To determine how many ml the nurse should administer, divide the prescribed dose by the concentration:
30 mg ÷ 100 mg/ml = 0.3 ml.
Why the Other Options are Incorrect:
B. 0.4 ml is incorrect because it would overestimate the volume needed.
C. 0.5 ml is incorrect because it would deliver 50 mg, which exceeds the prescribed 30 mg.
D. 0.6 ml is incorrect because it would deliver 60 mg, which exceeds the prescribed 30 mg.
Summary:
The nurse should administer 0.3 ml of thiamine HCL to provide the prescribed 30 mg dose. The correct answer is A. 0.3 ml.
Hydroxyzine 75 mg IM is ordered for anxiety.
Available: Hydroxyzine 50 mg/mL.
How many milliliters will the nurse administer?
(Round to the nearest tenth)
Select one:
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1.2 mL
-
1.4 mL
-
1.5 mL
-
1.7mL
Explanation
Correct Answer:
C. 1.5 mL
Explanation of Correct Answer:
Step 1: Use the formula:
Volume (mL) = Dose ordered ÷ Concentration available
= 75 mg ÷ 50 mg/mL
= 1.5 mL
Why the Other Options are Incorrect:
A. 1.2 mL = Equals 60 mg — too low.
B. 1.4 mL = Equals 70 mg — still not enough.
C. 1.5 mL = Correct — delivers full 75 mg.
D. 1.7 mL = Equals 85 mg — too much.
Summary:
To administer 75 mg of hydroxyzine using a 50 mg/mL solution, the nurse will give 1.5 mL.
A client receives a prescription for tobramycin sulfate (Nebcin) 0.128 grams IV every 8 hours. Tobramycin is available in liquid concentration of 40 mg/ml. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
-
2.8 mL
-
3.0 mL
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3.2 mL
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3.5 mL
Explanation
Correct Answer:
C. 3.2 mL
Explanation of Correct Answer:
First, convert 0.128 grams to milligrams:
0.128 grams = 128 mg.
The concentration of tobramycin is 40 mg/mL.
To find the volume to administer, divide the prescribed dose by the concentration:
128 mg ÷ 40 mg/mL = 3.2 mL.
Why the Other Options are Incorrect:
A. 2.8 mL is incorrect because it underestimates the required volume.
B. 3.0 mL is incorrect because it does not provide the exact dose required.
D. 3.5 mL is incorrect because it overestimates the required volume.
Summary:
The nurse should administer 3.2 mL of tobramycin sulfate (Nebcin) to provide the prescribed 0.128 grams dose. The correct answer is C. 3.2 mL.
A nurse is preparing to administer megestrol 200 mg PO to a client. Available is megestrol oral suspension 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
-
5 mL
Explanation
Correct Answer: 5 mL
(200 mg ÷ 40 mg) × 1 mL = 5 mL.
A nurse is preparing to administer cefazolin 250 mg via intermittent IV bolus every 8 hr. Available is cefazolin 500 mg vial. The package insert instructs to add 2 mL of sterile water to yield a concentration of 225 mg/mL and then add to 50 mL of 0.9% sodium chloride. How many mL of cefazolin should the nurse add to the 50 mL of 0.9% sodium chloride? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
-
1.1 mL
Explanation
Correct Answer: 1.1 mL
Formula: (Dose ordered ÷ Dose available) × Volume = (250 mg ÷ 225 mg) × 1 mL = 1.111 mL ≈ 1.1 mL.
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? (If rounding is required, round to the nearest tenth.)
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4 ounces
-
6 ounces
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8 ounces
-
10 ounces
Explanation
Correct Answer: A. 4 ounces
Why this answer is correct:
The client needs to take 120 mL of the meal replacement four times a day.
To convert milliliters to ounces, use the conversion factor: 1 ounce = 30 mL.
To determine how many ounces correspond to 120 mL:
120 mL ÷ 30 mL/ounce = 4 ounces.
Therefore, the correct volume is 4 ounces, but this question asks you to round to the nearest tenth. Thus, the nurse should instruct the client to take 4 ounces.
Why the other options are wrong:
B. 6 ounces – This is incorrect. If the client took 6 ounces, that would be 180 mL (6 ounces × 30 mL/ounce), which exceeds the prescribed 120 mL.
C. 8 ounces – This is also incorrect. 8 ounces would be 240 mL (8 ounces × 30 mL/ounce), which is much more than the prescribed dose of 120 mL.
D. 10 ounces – Similarly, 10 ounces would be 300 mL (10 ounces × 30 mL/ounce), which is incorrect and exceeds the required amount.
Summary:
The client should take 4 ounces for each dose, which is equivalent to the prescribed 120 mL. Therefore, the correct answer is A. 4 ounces.
A continuous infusion of heparin 10 unit/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? (Enter numeric value only.)
-
12 mL/hour
-
15 mL/hour
-
14 mL/hour
-
13 mL/hour
Explanation
Correct Answer: B. 15 mL/hour
Why this answer is correct:
Step 1: Convert the client's weight to kilograms.
165 pounds ÷ 2.2 = 75 kg
Step 2: Calculate the total heparin dose required per hour.
10 units × 75 kg = 750 units/hour
Step 3: Find the concentration of heparin in the IV bag.
25,000 units ÷ 500 mL = 50 units/mL
Step 4: Calculate the required mL/hour.
750 units ÷ 50 units/mL = 15 mL/hour
Therefore, the nurse should program the infusion pump to deliver 15 mL/hour.
Why the other options are wrong:
A. 12 mL/hour – At 50 units/mL, this would deliver only 600 units/hour, which is insufficient for the prescribed dose of 750 units/hour.
C. 14 mL/hour – At 50 units/mL, this would deliver 700 units/hour, which is still underdosing the client.
D. 13 mL/hour – At 50 units/mL, this would deliver 650 units/hour, again not enough to meet the 750 units/hour required dose.
Summary:
After converting 165 pounds to 75 kg, and applying the prescribed dosage of 10 units/kg/hour, the client should receive 750 units/hour. Since the IV solution concentration is 50 units/mL, the correct infusion rate is 15 mL/hour.
Thus, the correct answer is B. 15 mL/hour.
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Frequently Asked Question
ULOSCA integrates step-by-step problem-solving techniques and scenario-based questions that mimic real-world nursing situations. By combining practice questions with real-life applications, it enhances your ability to calculate accurate dosages and reduce medication errors.
Absolutely. ULOSCA’s resources include specific modules on weight-based and pediatric dosages, guiding you through complex calculations. It ensures you understand the nuances of adjusting doses based on age, weight, and medical conditions, a critical component of the ATI Dosage Calculation exam.
ULOSCA provides detailed formulas, practice questions, and case studies focused on IV calculations. It teaches you how to calculate flow rates, infusion times, and drip factors accurately, essential for both the exam and clinical practice.
Yes, ULOSCA includes test-taking strategies that help you analyze complex dosage problems, manage exam time effectively, and identify key information in medication orders. These strategies are designed to enhance your confidence and performance on the ATI Dosage Calculation exam.
ULOSCA emphasizes the "Five Rights" of medication administration (right patient, drug, dose, route, and time) in every aspect of its resources. By integrating safety protocols into practice questions and case studies, it reinforces safe medication practices for both exams and real-world scenarios.
Yes, ULOSCA includes a comprehensive review of basic math skills required for dosage calculations, such as fractions, decimals, ratios, and percentages. It ensures you have a solid foundation to tackle all types of dosage problems confidently.
ULOSCA provides diverse study tools, including interactive case studies, quizzes, visual aids, and written guides. This ensures that students with varying learning styles—visual, hands-on, or auditory—can effectively prepare for the ATI Dosage Calculation exam.