ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
The healthcare provider prescribes trimethobenzamide 100 mg IM every 6 hours for a client with postoperative vomiting. "Each 2 mL single-dose vial contains 200 mg of trimethobenzamide." How many mL should the nurse administer to the client for each dose? (Enter numeric value only.)
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1 mL
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2 mL
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3 mL
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4 mL
Explanation
Correct Answer: A. 1 mL
Why this answer is correct:
Prescribed dose: The healthcare provider has prescribed 100 mg of trimethobenzamide IM.
Available concentration: The vial contains 200 mg of trimethobenzamide in 2 mL.
To determine how many mL to administer for a 100 mg dose:
First, calculate the concentration of the medication per mL:
200 mg ÷ 2 mL = 100 mg/mL.
To administer 100 mg, the nurse needs to give 1 mL (since 100 mg is the same as 1 mL of the solution).
Thus, the nurse should administer 1 mL for each dose.
Why the other options are wrong:
B. 2 mL – This would administer 200 mg, which is double the prescribed dose of 100 mg.
C. 3 mL – This would administer 300 mg, which exceeds the prescribed dose and could lead to overdose.
D. 4 mL – This would administer 400 mg, which is also too much and could result in toxicity.
Summary:
The nurse should administer 1 mL of the trimethobenzamide solution for each dose to deliver the prescribed 100 mg. Therefore, the correct answer is A. 1 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
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3.0 mL
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3.2 mL
-
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 patient with hypokalemia has potassium chloride 20 mEq twice a day per gastric tube ordered. The potassium elixir concentration is 40 mEq per 30 mL. How many milliliters would the nurse administer with each dose?
Select one:
-
10 mL
-
12 mL
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15 mL
-
20 mL
Explanation
Correct Answer:
A. 15 mL
Explanation of Correct Answer:
Step 1: Calculate concentration in mEq/mL:
40mEq÷30mL=1.33mEq/mL
Step 2: Calculate volume to administer per dose:
20 mEq÷1.33 mEq/mL=15.04
Rounded to the nearest whole number: 15 mL
Why the Other Options are Incorrect:
A. 10 mL = Only 13.3 mEq — insufficient dose.
B. 12 mL = About 16 mEq — still less than ordered.
D. 20 mL = About 26.6 mEq — overdosing.
Summary:
The nurse should administer 15 mL of potassium chloride elixir to provide 20 mEq per dose.
A nurse is preparing to administer phenytoin 15 mg/kg PO to a school-age child who weighs 55 lb. Available is phenytoin suspension 125 mg/5 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.)
-
10 mL
-
12 mL
-
15 mL
-
18 mL
Explanation
Correct answer: C. 15 mL
Detailed explanation of the correct answer:
Step 1: Convert the child's weight from pounds to kilograms:
55 lb ÷ 2.2 lb/kg = 25 kg
Step 2: Calculate the total dose of phenytoin:
15 mg/kg × 25 kg = 375 mg
Step 3: Determine how many mL are required for the dose:
The concentration of phenytoin suspension is 125 mg/5 mL. To find the amount of suspension needed for 375 mg, divide the dose by the concentration:
375 mg ÷ 125 mg/5 mL = 375 ÷ 25 = 15 mL
Explanation of why the other options are incorrect:
A. 10 mL is incorrect because it would deliver less than the required 375 mg dose.
B. 12 mL is incorrect because it is not enough to deliver the required 375 mg dose.
D. 18 mL is incorrect because it would administer more than the required 375 mg dose.
Summary:
The nurse should administer 15 mL of phenytoin suspension to provide a dose of 375 mg for the child weighing 55 lb.
How many milliliters of Tylenol oral suspension should Jason's mom measure out per dose, if Jason weighs 76 pounds?
NOTE: Self-treatment should not exceed 3 days unless directed by a physician. Do not use more than 4 times a day. Give the recommended dose every 6-8 hours as needed.
Select one:
-
5 mL
-
7.5 mL
-
10 mL
-
16.2 mL
Explanation
Correct Answer:
D. 16.2 mL
Explanation of Correct Answer:
Convert Jason's weight from pounds to kilograms:
76 lb ÷ 2.2 = 34.5 kg.
Determine the recommended dosage for Jason:
The typical recommended dose of Tylenol for children is 15 mg per kg of body weight.
15 mg × 34.5 kg = 517.5 mg per dose.
Determine the concentration of the Tylenol oral suspension:
The concentration is typically 160 mg/5 mL.
Calculate the number of milliliters per dose:
To find out how many mL to administer, use the formula:
(517.5 mg ÷ 160 mg) × 5 mL = 16.2 mL.
Why the Other Options are Incorrect:
A. 5 mL is incorrect because it is too low of a dose.
B. 7.5 mL is incorrect because it is also too low to achieve the correct dose.
C. 10 mL is incorrect because it does not meet the required dosage.
Summary:
Jason's mom should measure 16.2 mL of Tylenol oral suspension per dose. The correct answer is D. 16.2 mL.
Azithromycin 500 mg IV once a day is ordered for a patient. The azithromycin is dissolved in 250 mL of NS and should infuse over 60 minutes. Using an IV pump, how many milliliters per hour should the azithromycin be infused? Round your answer to the nearest whole number
-
100 mL/hr
-
150 mL/hr
-
250 mL/hr
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300 mL/hr
Explanation
Correct answer: C. 250 mL/hr
Detailed explanation of the correct answer:
To calculate the flow rate in milliliters per hour (mL/hr), use the formula:
Flow rate (mL/hr) = Total volume (mL) ÷ Time (hours)
Given:
Total volume = 250 mL
Time = 60 minutes (which is 1 hour)
Now, calculate the flow rate:
Flow rate = 250 mL ÷ 1 hr = 250 mL/hr
Explanation of why the other options are incorrect:
A. 100 mL/hr is incorrect because it would deliver less fluid than required for the 250 mL infusion over 1 hour.
B. 150 mL/hr is incorrect because it would deliver less fluid, causing the infusion to take longer than 1 hour.
D. 300 mL/hr is incorrect because it would infuse the solution faster than the prescribed 1 hour.
Summary:
The azithromycin should be infused at 250 mL/hr to complete the infusion in 1 hour.
A client with the diagnosis of cellulitis and staphylococcus aureus is receiving intermittent infusions of daptomycin daily at home. The local pharmacy delivers a minibag labeled: "Infuse daptomycin 500 mg/100mL over 30 minutes." The IV tubing delivers 15 drops per mL. The home health nurse should regulate the infusion to deliver how many drops per minute? (Enter numeric value only.)
-
25 gtt/min
-
42 gtt/min
-
50 gtt/min
-
75 gtt/min
Explanation
Correct Answer: C. 50 gtt/min
Detailed Explanation of the Correct Answer:
Step 1: Use the drops per minute (gtt/min) formula:
gtt/min = (Volume to infuse in mL × Drop factor) ÷ Time in minutes
Step 2: Plug in the known values:
Volume to infuse = 100 mL
Drop factor = 15 gtt/mL
Time = 30 minutes
gtt/min = (100 × 15) ÷ 30
gtt/min = 1500 ÷ 30
gtt/min = 50 gtt/min
Explanation of Incorrect Options:
A. 25 gtt/min underestimates the flow rate and would result in the infusion taking longer than 30 minutes.
B. 42 gtt/min is closer, but still under the required rate and would not deliver the full dose in 30 minutes.
D. 75 gtt/min overestimates the flow rate and would deliver the medication too quickly, potentially causing adverse effects.
Summary:
To infuse 100 mL over 30 minutes with tubing that delivers 15 gtt/mL, use the formula (100 × 15) ÷ 30 = 50 gtt/min. The correct answer is C. 50 gtt/min.
Mrs. Banks was just given 2 mL of morphine 5 mg/mL solution. How many milligrams of morphine did she receive?
Select one:
-
0.5
-
2.5
-
5
-
10
Explanation
Correct Answer:
D. 10
Explanation of Correct Answer:
Set up the calculation:
The concentration is 5 mg/mL.
The volume administered is 2 mL.
Use the formula:
Dose (mg) = Volume (mL) × Concentration (mg/mL)
Dose = 2 mL × 5 mg/mL
Solve the equation:
Dose = 10 mg
Why the Other Options are Incorrect:
A. 0.5 mg would be too low for the given concentration.
B. 2.5 mg is incorrect because it does not match the volume and concentration.
C. 5 mg is not the correct total amount for 2 mL of solution.
Summary:
Mrs. Banks received 10 mg of morphine. The correct answer is D. 10.
A nurse is preparing to administer dextrose 5% in 0.45% sodium chloride 500 mL IV to infuse over 8 hr. 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.)
-
60 mL/hr
-
62 mL/hr
-
63 mL/hr
-
65 mL/hr
Explanation
Correct answer: C. 63 mL/hr
Detailed explanation of the correct answer:
Step 1: The total volume is 500 mL.
Step 2: The total time is 8 hours.
Step 3: To find the infusion rate, divide the total volume by the total time:
Infusion rate = 500 mL ÷ 8 hr = 62.5 mL/hr
Step 4: Round to the nearest whole number:
62.5 rounds to 63 mL/hr.
Explanation of why the other options are incorrect:
A. 60 mL/hr is incorrect because it is less than the correct amount of 63 mL/hr.
B. 62 mL/hr is incorrect because it is rounded down from the correct 63 mL/hr.
D. 65 mL/hr is incorrect because it exceeds the correct infusion rate of 63 mL/hr.
Summary:
The nurse should set the IV pump to deliver 63 mL/hr.
A child receives a prescription for loratadine 5 mg by mouth once day. The bottled 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? (Enter numerical value only.)
-
0.5 tsp
-
1 tsp
-
1.5 tsp
-
2 tsp
Explanation
Correct Answer: B. 1 tsp
Detailed Explanation of the Correct Answer:
Step 1: Identify the prescribed dose and the concentration.
Prescribed dose = 5 mg
Concentration = 5 mg per 5 mL
Step 2: Determine how many mL are needed for the prescribed dose.
Since 5 mg = 5 mL (based on the label), the child should receive 5 mL per dose.
Step 3: Convert mL to teaspoons.
1 teaspoon = 5 mL
So, 5 mL ÷ 5 mL per tsp = 1 tsp
Explanation of Incorrect Options:
A. 0.5 tsp = 2.5 mL, which is only half the prescribed dose.
C. 1.5 tsp = 7.5 mL, which would give too much medication.
D. 2 tsp = 10 mL, which would give double the prescribed dose.
Summary:
A dose of 5 mg corresponds to 5 mL, which is equal to 1 teaspoon. The correct answer is B. 1 tsp.
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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.