ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
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? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
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10 hours
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12 hours
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13 hours
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15 hours
Explanation
Correct Answer: 13
Detailed Explanation: To determine how many hours the IV should infuse, follow these steps:
Identify the prescribed dose and available concentration:
Prescribed dose: 10 units per hour
Available concentration: 125 units in 250 mL
Calculate how many units are in 1 mL of the solution:
125 units ÷ 250 mL = 0.5 units per mL
Now, determine how many mL will provide the prescribed dose of 10 units per hour:
10 units ÷ 0.5 units/mL = 20 mL per hour
Finally, calculate how many hours the 250 mL of solution will last:
250 mL ÷ 20 mL per hour = 12.5 hoursSince rounding is required, the answer rounds to 13 hours.
Explanation of Incorrect Options:
A. 10 hours – This is incorrect because it underestimates the time needed to administer the full dose of insulin.
B. 12 hours – This is incorrect because it slightly rounds down, missing the correct duration of 13 hours.
C. 15 hours – This is incorrect because it would indicate a much slower infusion rate than prescribed.
Summary: The IV should infuse for 13 hours, based on the concentration of the insulin solution and the prescribed dosage rate.
A nurse is preparing to administer ketorolac 12 mg IV bolus to an adolescent. The amount available is ketorolac injection 15 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
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0.6 mL
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0.8 mL
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1.0 mL
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1.2 mL
Explanation
Correct answer: B. 0.8 mL
Detailed explanation of the correct answer:
To calculate the volume of ketorolac to administer, we use the formula:
Dose to give ÷ Dose available = mL to administer
Given:
Dose to give = 12 mg
Available concentration = 15 mg/mL
Using the formula:
12 mg ÷ 15 mg/mL = 0.8 mL
Therefore, the nurse should administer 0.8 mL.
Explanation of why the other options are incorrect:
A. 0.6 mL is incorrect because it is a lower volume than the calculated required dose of 0.8 mL.
C. 1.0 mL is incorrect because it is a higher volume than needed based on the prescribed dose and available concentration.
D. 1.2 mL is incorrect because it exceeds the required volume for the 12 mg dose.
Summary:
The nurse should administer 0.8 mL of ketorolac to the adolescent.
You need to prepare 1,400 units of heparin for a patient. Your pharmacy has heparin 1,000 units/mL in stock. How many milliliters will you dispense?
Select one:
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0.14
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1.4
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14
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140
Explanation
Correct Answer:
B. 1.4
Explanation of Correct Answer:
Identify the information given:
Desired dose = 1,400 units
Concentration = 1,000 units/mL
Use the formula:
Volume (mL) = Dose (units) ÷ Concentration (units/mL)
Perform the calculation:
1,400 ÷ 1,000 = 1.4 mL
Why the Other Options are Incorrect:
A. 0.14 mL would deliver only 140 units, which is far less than 1,400 units.
C. 14 mL would deliver 14,000 units, which is much too high.
D. 140 mL would deliver 140,000 units, which is dangerously incorrect.
Summary:
The nurse should prepare and dispense 1.4 mL of heparin to provide the ordered 1,400 units. The correct answer is B. 1.4.
Tigecycline 100 mg IV once a day is ordered for a patient. The tigecycline is dissolved in 50 mL of NS and should infuse over 60 minutes. Using an IV pump, how many milliliters per hour should the tigecycline be infused? Round your answer to the nearest whole number
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25 mL/hr
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50 mL/hr
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75 mL/hr
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100 mL/hr
Explanation
Correct answer: B. 50 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 = 50 mL
Time = 60 minutes (which is 1 hour)
Now, calculate the flow rate:
Flow rate = 50 mL ÷ 1 hr = 50 mL/hr
Explanation of why the other options are incorrect:
A. 25 mL/hr is incorrect because it would infuse too slowly and take 2 hours for the full 50 mL infusion.
C. 75 mL/hr is incorrect because it would infuse too quickly, taking less than 1 hour to deliver the entire 50 mL.
D. 100 mL/hr is incorrect because it would infuse the 50 mL too quickly, completing the infusion in only 30 minutes.
Summary:
The tigecycline should be infused at 50 mL/hr to complete the infusion in 1 hour.
A nurse is preparing to administer ondansetron 0.1 mg/kg IV bolus to a toddler who weighs 32 lb. Available is ondansetron injection 2 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
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0.25 mL
-
0.45 mL
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0.73 mL
-
1.00 mL
Explanation
Correct answer: C. 0.73 mL
Detailed explanation of the correct answer:
Convert the toddler's weight from pounds to kilograms:
32 lb ÷ 2.2 = 14.55 kg.
Calculate the required dose:
0.1 mg/kg × 14.55 kg = 1.455 mg.
Use the available concentration to calculate the volume:
Available concentration = 2 mg/mL
Required dose = 1.455 mg
To calculate the volume:
1.455 mg ÷ 2 mg/mL = 0.7275 mL.
Rounded to the nearest hundredth, this gives 0.73 mL.
Explanation of why the other options are incorrect:
A. 0.25 mL is incorrect because it is too small and would not provide the correct dose.
B. 0.45 mL is incorrect because it would give too much of the medication.
D. 1.00 mL is incorrect because it would be an overestimation of the required dose.
Summary:
The nurse should administer 0.73 mL of ondansetron IV bolus to deliver the correct dose.
The physician orders a continuous IV morphine drip to infuse at 5 mg/h. The medication is supplied in 100 mg/100 mL. Calculate the flow rate in milliliters per hour. Round your answer to the nearest whole number.
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2 mL/h
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5 mL/h
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10 mL/h
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15 mL/h
Explanation
Correct answer: B. 5 mL/h
Detailed explanation of the correct answer:
To calculate the flow rate for the continuous IV morphine drip:
Identify the dose and concentration
The physician ordered 5 mg/h, and the concentration is 100 mg/100 mL, which simplifies to 1 mg/mL.
Apply the formula for flow rate
The formula to calculate the flow rate is:
Flow rate (mL/h) = Dose (mg/h) ÷ Concentration (mg/mL)
Now, plug in the values:
Flow rate = 5 mg/h ÷ 1 mg/mL = 5 mL/h
Explanation of why the other options are incorrect:
A. 2 mL/h is incorrect because it underestimates the flow rate.
C. 10 mL/h is incorrect because it overestimates the flow rate.
D. 15 mL/h is incorrect because it significantly overestimates the flow rate.
Summary:
The correct flow rate for the continuous IV morphine drip is 5 mL/h.
A client is receiving ketorolac IM 45 mg every 6 hours for postoperative pain. The available 2 mL vial is labeled, "Ketorolac IM 30 mg/mL." How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
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0.5 mL
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1.5 mL
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2 mL
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1 mL
Explanation
Correct Answer: B. 1.5 mL
Detailed Explanation of the Correct Answer:
Step 1: Identify the prescribed dose and the available concentration.
Prescribed dose = 45 mg
Available concentration = 30 mg/mL
Step 2: Use the formula to calculate the volume needed.
Volume (mL) = Prescribed dose (mg) ÷ Concentration (mg/mL)
Volume (mL) = 45 mg ÷ 30 mg/mL
Volume (mL) = 1.5 mL
Explanation of Incorrect Options:
A. 0.5 mL would provide only 15 mg, which is too low.
C. 2 mL would provide 60 mg, which is too much.
D. 1 mL would provide 30 mg, which is insufficient for the prescribed dose.
Summary:
To administer 45 mg of ketorolac with a concentration of 30 mg/mL, the nurse should administer 1.5 mL. The correct answer is B. 1.5 mL.
A nurse is preparing to administer methimazole 0.3 mg/kg/day PO divided in equal doses every 8 hr to a school-age child who weighs 55 lb. Available is methimazole 5 mg tablets. How many tablets should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
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0.1 tablet
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0.5 tablet
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1 tablet
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2 tablets
Explanation
Correct answer: B. 0.5 tablet
Detailed explanation of the correct answer:
First, the child's weight is converted from pounds to kilograms:
55 lb ÷ 2.2 = 25 kg.
The total daily dose is calculated as:
0.3 mg/kg/day × 25 kg = 7.5 mg/day.
The total daily dose is divided by 3 (since the medication is given every 8 hours):
7.5 mg ÷ 3 = 2.5 mg per dose.
The available methimazole is 5 mg per tablet, so to get 2.5 mg per dose, divide the required dose by the concentration:
2.5 mg ÷ 5 mg = 0.5 tablet per dose.
Therefore, the nurse should administer 0.5 tablet per dose.
Explanation of why the other options are incorrect:
A. 0.1 tablet is incorrect because it is too small a portion to meet the required dose of 2.5 mg.
C. 1 tablet is incorrect because it is too large for the required dose of 2.5 mg per dose.
D. 2 tablets is incorrect because it exceeds the required dose and would give too much medication.
Summary:
The nurse should administer 0.5 tablet per dose to provide the correct 2.5 mg dose.
The nurse is initiating a 500 mL IV of normal saline at 60 mL/hour for a client with heart failure. How many hours should the IV infuse? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
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8.0 hours
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8.3 hours
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7.5 hours
-
6.2 hours
Explanation
Correct Answer: B. 8.3 hours
Why this answer is correct:
To determine how many hours the IV will take to infuse, divide the total volume by the rate:
500 mL ÷ 60 mL/hour = 8.333... hours
Rounded to the nearest tenth, this is 8.3 hours.
Why the other options are wrong:
A. 8.0 hours – This would correspond to only 480 mL infused (60 mL/hr × 8 hrs), which is less than the prescribed 500 mL.
C. 7.5 hours – This would provide only 450 mL total, which is significantly less than required.
D. 6.2 hours – At 60 mL/hr, this would result in just 372 mL infused, far below the target volume.
Summary:
The nurse is to infuse 500 mL at a rate of 60 mL/hour. Dividing the total volume by the infusion rate gives 8.333... hours, which rounds to 8.3 hours. The correct answer is B. 8.3 hours.
The physician orders dopamine IV drip at 4 mcg/kg/min for low blood pressure. The patient weighs 154 lb. The medication is supplied in 400 mg/250 mL of 0.45% NS. Calculate the flow rate in milliliters per hour. Round your final answer to the nearest tenth
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10.5 mL/h
-
12.0 mL/h
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8.0 mL/h
-
9.0 mL/h
Explanation
Correct answer: A. 10.5 mL/h
Detailed explanation of the correct answer:
To calculate the flow rate for the dopamine infusion:
Convert weight from pounds to kilograms:
154 lb ÷ 2.2 = 70 kg
Calculate the dosage in mcg/min:
4 mcg × 70 kg = 280 mcg/min
Convert mcg/min to mcg/hour:
280 mcg/min × 60 min = 16,800 mcg/hour
Convert mcg/hour to mg/hour:
16,800 mcg ÷ 1000 = 16.8 mg/hour
Use the concentration to find the mL/hour rate:
Concentration = 400 mg ÷ 250 mL = 1.6 mg/mL
Flow rate = 16.8 mg ÷ 1.6 mg/mL = 10.5 mL/hour
Explanation of why the other options are incorrect:
B. 12.0 mL/h is incorrect because it overestimates the required flow rate.
C. 8.0 mL/h is incorrect because it underestimates the required flow rate.
D. 9.0 mL/h is incorrect because it underestimates the required flow rate.
Summary:
The nurse should set the IV pump to deliver 10.5 mL/h for the dopamine infusion.
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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.