ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
A nurse is preparing to administer magnesium hydroxide/aluminum hydroxide 30 mL PO to an adolescent. How many oz 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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0 oz
-
1 oz
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2 oz
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3 oz
Explanation
Correct answer: B. 1 oz
Detailed explanation of the correct answer:
To convert milliliters (mL) to ounces (oz), the conversion factor used is 1 oz = 30 mL.
Given the prescribed dose is 30 mL, dividing by the conversion factor (30 mL = 1 oz) results in 1 oz.
Thus, the nurse should administer 1 oz of magnesium hydroxide/aluminum hydroxide.
Explanation of why the other options are incorrect:
A. 0 oz is incorrect because the prescribed dose is 30 mL, which equals 1 oz, not 0 oz.
C. 2 oz is incorrect because the required dose of 30 mL converts to 1 oz, not 2 oz.
D. 3 oz is incorrect because 30 mL does not equal 3 oz.
Summary:
The nurse should administer 1 oz of magnesium hydroxide/aluminum hydroxide to the adolescent.
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.)
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25 gtt/min
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42 gtt/min
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50 gtt/min
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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.
The physician orders heparin 5,500 units subcutaneously for deep vein thrombosis prevention. The medication is supplied as 10,000 units/mL. How many milliliters will the nurse administer? (Round to the nearest hundredth) For answers less than 1, use a leading zero (ex. 0.2); avoid trailing zeros.
Select one:
-
0.50 mL
-
0.55 mL
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0.60 mL
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0.65 mL
Explanation
Correct Answer:
B. 0.55 mL
Explanation of Correct Answer:
Step 1: Use the formula:
Volume (mL)=Dose (units)÷Concentration (units/mL)
5,500÷10,000=0.55 mL
Why the Other Options are Incorrect:
A. 0.50 mL = 5,000 units — underdosing.
C. 0.60 mL = 6,000 units — overdosing.
D. 0.65 mL = 6,500 units — too much.
Summary:
The nurse should administer 0.55 mL of heparin to deliver 5,500 units subcutaneously.
A client who weighs 176 pounds receives a prescription for filgrastim 5 mcg/kg/daily subcutaneously for 14 days. The medication is available in a 300 mcg/mL vial. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
-
0.2 mL
-
0.3 mL
-
0.4 mL
-
1.3 mL
Explanation
Correct answer: D. 1.3 mL
Detailed explanation:
Convert weight from pounds to kilograms:
The client weighs 176 pounds.
Convert pounds to kilograms by dividing by 2.2:
176 ÷ 2.2 = 80 kg.
Calculate the total required dose in mcg:
The prescribed dose is 5 mcg/kg/day.
Multiply the weight in kg by the prescribed dose:
80 kg × 5 mcg/kg = 400 mcg per day.
Determine how many mL to administer:
The concentration available is 300 mcg/mL.
To find how many mL corresponds to 400 mcg:
400 mcg ÷ 300 mcg/mL = 1.33 mL.
Round the volume to the nearest tenth:
1.33 mL rounds to 1.3 mL.
Explanation of the incorrect options:
A. 0.2 mL - This is too small of a dose based on the calculations.
B. 0.3 mL - This is too small and would not provide the correct amount of medication.
C. 0.4 mL - This is also incorrect and would not be the correct volume for the prescribed dose.
Summary:
The correct amount to administer is 1.3 mL of the filgrastim solution based on the prescribed dosage of 5 mcg/kg daily.
Calculate how many milliliters the patient will receive for the following order:
Demerol 90 mg IM solution
On hand: Demerol 25 mg/0.5 mL solution
Select one:
-
0.13
-
1.8
-
1.125
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4500
Explanation
Correct Answer:
B. 1.8
Explanation of Correct Answer:
Set up the calculation:
The order is for 90 mg of Demerol.
The available concentration is 25 mg/0.5 mL.
Use the formula to calculate volume:
Volume (mL) = Dose (mg) ÷ Concentration (mg/mL)
Calculate the concentration:
First, determine the concentration in mg/mL:
25 mg ÷ 0.5 mL = 50 mg/mL
Now calculate the volume needed to deliver 90 mg:
Volume = 90 mg ÷ 50 mg/mL
Volume = 1.8 mL
Why the Other Options are Incorrect:
A. 0.13 mL is too small a volume for 90 mg of Demerol.
C. 1,125 mL is far too large for the required dose.
D. 4,500 mL is also too large and not plausible for this dose.
Summary:
The patient will receive 1.8 mL of Demerol. The correct answer is B. 1.8.
A patient in shock has an order for a neo-synephrine drip at 50 mcg/min. The pharmacy dilutes 50 mg of neo-synephrine in 250 mL of NS. How many milliliters per hour should the neo-synephrine drip be infused? (Round to the nearest tenth)
Select one:
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15.0 mL/hr
-
30.0 mL/hr
-
60.0 mL/hr
-
90.0 mL/hr
Explanation
Correct Answer:
A. 15.0 mL/hr
Explanation of Correct Answer:
Step 1: Convert concentration from mg to mcg
50 mg=50,000 mcg
50,000÷250 mL=200 mcg/mL
50,000÷250mL=200mcg/mL
Step 2: Calculate flow rate in mL/min
Flow rate (mL/min)=Dose (mcg/min)÷Concentration (mcg/mL)
50÷200=0.25 mL/min
Step 3: Convert to mL/hr
0.25×60=15.0mL/hr
Why the Other Options are Incorrect:
B. 30.0 mL/hr = Double the ordered dose.
C. 60.0 mL/hr = Four times the ordered dose.
D. 90.0 mL/hr = Six times the ordered dose.
Summary:
The neo-synephrine drip should be infused at 15.0 mL/hr to deliver 50 mcg/min with the given concentration.
The healthcare provider prescribes an IV solution of regular insulin 100 units in 250 mL of 0.45% saline to infuse at 12 units/hour. The nurse should program the infusion pump to deliver how many mL/hour? (Enter numeric value only.)
-
30 mL/hour
-
25 mL/hour
-
20 mL/hour
-
15 mL/hour
Explanation
Correct Answer: A. 30 mL/hour
Why this answer is correct:
To determine how many mL/hour to infuse, calculate the concentration of insulin in the IV solution:
100 units ÷ 250 mL = 0.4 units/mL
Next, determine how many mL/hour are needed to deliver 12 units/hour:
12 units ÷ 0.4 units/mL = 30 mL/hour
So, the nurse should program the infusion pump to deliver 30 mL/hour.
Why the other options are wrong:
B. 25 mL/hour – This delivers 10 units/hour (0.4 × 25 = 10), which is underdosing.
C. 20 mL/hour – This delivers only 8 units/hour (0.4 × 20 = 8), which is also underdosing.
D. 15 mL/hour – This delivers just 6 units/hour (0.4 × 15 = 6), which is significantly less than the prescribed dose.
Summary:
To infuse regular insulin at a rate of 12 units/hour from a solution containing 100 units in 250 mL (0.4 units/mL), the nurse should set the infusion pump to deliver 30 mL/hour. The correct answer is A. 30 mL/hour.
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.)
-
10 hours
-
12 hours
-
13 hours
-
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 clindamycin 10 mg/kg IM to a school-age child who weighs 77 Ib. Available is clindamycin injection 150 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.)
-
2.0 mL
-
2.3 mL
-
3.0 mL
-
3.5 mL
Explanation
Correct answer: B. 2.3 mL
Detailed explanation of the correct answer:
Step 1: Convert the child's weight from pounds to kilograms:
77 lb ÷ 2.2 lb/kg = 35 kg
Step 2: Calculate the total dose of clindamycin:
10 mg/kg × 35 kg = 350 mg
Step 3: Determine how many mL are required for the dose:
The concentration of clindamycin injection is 150 mg/mL. To find the amount of injection needed for 350 mg, divide the dose by the concentration:
350 mg ÷ 150 mg/mL = 2.33 mL
Rounding to the nearest tenth, the nurse should administer 2.3 mL.
Explanation of why the other options are incorrect:
A. 2.0 mL is incorrect because it is less than the required 2.3 mL.
C. 3.0 mL is incorrect because it is more than the required 2.3 mL.
D. 3.5 mL is incorrect because it is much more than the required 2.3 mL.
Summary:
The nurse should administer 2.3 mL of clindamycin injection to deliver a dose of 350 mg for the child weighing 77 lb.
The healthcare provider prescribes ceftazidime 30 mg/kg/day for an infant weighing 3,500 grams. What dose should the nurse administer daily to this infant? (Enter numeric value only.)
-
105 mg
-
115 mg
-
120 mg
-
125 mg
Explanation
Correct Answer: A. 105 mg
Why this answer is correct (revised):
The weight of the infant is 3.5 kg (3,500 g ÷ 1,000).
The ordered dose is 30 mg per kg per day.
Dose = 30 mg × 3.5 kg = 105 mg
Why the other options are wrong:
B. 115 mg – This would imply a weight of about 3.8 kg, which is incorrect.
C. 120 mg – This would match 4 kg, but the infant weighs only 3.5 kg.
D. 125 mg – This would reflect a higher dose or higher weight than prescribed.
Summary:
For an infant weighing 3,500 grams, the daily ceftazidime dose is 105 mg. The correct answer is A. 105 mg.
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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.