ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
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 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.)
-
0.6 mL
-
0.8 mL
-
1.0 mL
-
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.
A nurse is preparing to administer ferrous fumarate 3 mg/kg PO 3 times a day to a toddler who weighs 22 Ib. Available is ferrous fumarate drops 45 mg/0.6 mL. How many mL 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.)
-
0.6 mL
-
0.7 mL
-
0.8 mL
-
0.9 mL
Explanation
Correct answer: B. 0.7 mL
Detailed explanation of the correct answer:
Step 1: Convert the toddler's weight from pounds to kilograms.
22 lb ÷ 2.2 = 10 kg
Step 2: Calculate the total dose per administration.
3 mg/kg × 10 kg = 30 mg per dose
Step 3: Use the available concentration to calculate the volume to administer.
Available concentration = 45 mg/0.6 mL
Volume to administer = 30 mg ÷ (45 mg ÷ 0.6 mL) = 30 mg ÷ 45 mg/mL × 0.6 mL = 0.4 mL per 10 mg, so 30 mg would be 0.6667 mL
Step 4: Round the answer to the nearest tenth.
0.6667 mL rounds to 0.7 mL
Thus, the nurse should administer 0.7 mL per dose.
Explanation of why the other options are incorrect:
A. 0.6 mL is incorrect because it is less than the correct amount of 0.7 mL.
C. 0.8 mL is incorrect because it is more than the correct amount of 0.7 mL.
D. 0.9 mL is incorrect because it exceeds the correct required volume.
Summary:
The nurse should administer 0.7 mL of ferrous fumarate drops per dose.
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? (Enter numerical value only.)
-
200 mL/hour
-
250 mL/hour
-
300 mL/hour
-
400 mL/hour
Explanation
Correct Answer: B. 250 mL/hour
Why this answer is correct:
To determine the infusion rate in mL/hour, use the following calculation:
The prescription is for 500 mL of azithromycin in normal saline (NS) to be infused over 2 hours.
To calculate the mL/hour, divide the total volume by the infusion time:
Volume (mL/hour) = 500 mL ÷ 2 hours = 250 mL/hour.
Thus, the nurse should program the infusion pump to deliver 250 mL/hour.
Why the other options are wrong:
A. 200 mL/hour – This would infuse 400 mL in 2 hours, which is less than the prescribed 500 mL.
C. 300 mL/hour – This would infuse 600 mL in 2 hours, which is more than the prescribed 500 mL.
D. 400 mL/hour – This would infuse 800 mL in 2 hours, which is also more than the prescribed amount.
Summary:
To administer 500 mL over 2 hours, the correct infusion rate is 250 mL/hour. Therefore, the correct answer is B. 250 mL/hour.
The healthcare provider prescribes an intermittent infusion of nafcillin (Unipen) 800 mg IV for a pediatric client. The drug is dispensed in a concentration of 250 mg/ml, and the recommended infusion concentration is 40 mg/ml. When adding the prescribed dose to the volume control device, how many ml of IV solution should the nurse add to dilute? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
-
16.8 mL
-
18.5 mL
-
20 mL
-
22.4 mL
Explanation
Correct Answer:
A. 16.8 mL
Explanation of Correct Answer:
The prescribed dose is 800 mg.
The recommended concentration is 40 mg/mL.
To find the volume of IV solution needed to dilute the medication to the proper concentration, use the formula:
Volume = Dose ÷ Concentration
Volume = 800 mg ÷ 40 mg/mL
Volume = 20 mL
However, you first need to recognize that the 800 mg of nafcillin comes from the stock solution concentration of 250 mg/mL.
First, calculate how much volume of stock solution provides 800 mg:
Volume of stock solution = Dose ÷ Stock concentration
Volume of stock solution = 800 mg ÷ 250 mg/mL
Volume of stock solution = 3.2 mL
Next, to achieve the final concentration of 40 mg/mL, the total volume (medication + diluent) must equal:
Total Volume = Dose ÷ Desired Concentration
Total Volume = 800 mg ÷ 40 mg/mL
Total Volume = 20 mL
Since 3.2 mL of the total volume is occupied by the medication itself, the amount of diluent (IV solution) needed is:
Diluent Volume = Total Volume – Medication Volume
Diluent Volume = 20 mL – 3.2 mL
Diluent Volume = 16.8 mL
Thus, the nurse must add 16.8 mL of IV solution to dilute.
Why the Other Options are Incorrect:
B. 18.5 mL is incorrect because if 18.5 mL of diluent were added, the final concentration would be weaker than 40 mg/mL. This would result in over-dilution, which is not per the prescribed concentration.
C. 20 mL is incorrect because 20 mL would be the total volume for the desired concentration (medication + diluent combined), not just the diluent amount. Simply adding 20 mL of diluent would create a total volume greater than necessary, causing the concentration to fall below the prescribed 40 mg/mL.
D. 22.4 mL is incorrect because it would dilute the drug even further than necessary, resulting in an even lower final concentration, which is outside the recommended guidelines for safe infusion.
Summary:
The prescribed 800 mg dose of nafcillin must be diluted to achieve a final concentration of 40 mg/mL. The stock solution provides 3.2 mL of medication. The total volume needed for correct infusion concentration is 20 mL. Subtracting the volume of medication from the total volume leaves 16.8 mL of IV solution that must be added to the volume control device. Therefore, the correct answer is A. 16.8 mL.
A child with a seizure disorder receives a prescription for phenytoin 20 mg by mouth (PO) every 8 hours. The suspension is available in 125 mg/5 mL. How many mL should the nurse administer? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)
-
0.8 mL
-
2 mL
-
4 mL
-
5 mL
Explanation
Correct Answer: A. 0.8 mL
Why this answer is correct:
To determine the correct volume of phenytoin suspension to administer, follow these steps:
The prescription is for 20 mg of phenytoin to be taken every 8 hours.
The available concentration is 125 mg in 5 mL.
To calculate how many mL contains 20 mg, use the following formula:
Volume (mL) = (Desired dose in mg / Available concentration in mg) × Volume in mL
Volume (mL) = (20 mg / 125 mg) × 5 mL
Volume (mL) = 0.8 mL
Thus, the nurse should administer 0.8 mL of the suspension.
Why the other options are wrong:
B. 2 mL – This would deliver 50 mg (125 mg/5 mL × 2 mL), which is far more than the prescribed 20 mg.
C. 4 mL – This would deliver 100 mg (125 mg/5 mL × 4 mL), which is even higher than the prescribed dose.
D. 5 mL – This would deliver 125 mg (the full strength of the suspension), which is well above the required 20 mg.
Summary:
The nurse needs to administer 0.8 mL of phenytoin suspension to provide the prescribed 20 mg. Therefore, the correct answer is A. 0.8 mL.
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.
The physician orders amiodarone IV drip at 0.5 mg/min for ventricular dysrhythmias. The medication is supplied as 900 mg in 500 mL of D5W. Calculate the flow rate in mL/hr. (Round to the nearest tenth)
Select one:
-
16.7 mL/hr
-
18.5 mL/hr
-
20.0 mL/hr
-
22.2 mL/hr
Explanation
Correct Answer:
A. 16.7 mL/hr
Explanation of Correct Answer:
Step 1: Calculate concentration in mg/mL
900mg÷500mL=1.8mg/mL
Step 2: Calculate mL/min flow rate
Flow rate (mL/min)=Dose (mg/min)÷Concentration (mg/mL)
0.5÷1.8=0.2778mL/min
Step 3: Convert to mL/hr
0.2778×60=16.7mL/hr
Why the Other Options are Incorrect:
B. 18.5 mL/hr = Slightly too fast.
C. 20.0 mL/hr = Overdosing.
D. 22.2 mL/hr = Significantly too high.
Summary:
Set the IV pump to 16.7 mL/hr to deliver amiodarone at 0.5 mg/min with the supplied concentration.
The nurse is preparing a tube feeding of Ensure 280 ml (50% solution). Full strength Ensure is available in a 240 ml can. The nurse should use how many ml of Ensure to prepare the feeding? (Enter numeric value for only. If rounding is required, round to nearest whole number.)
-
140 mL
-
150 mL
-
135 mL
-
120 mL
Explanation
Correct Answer: A. 140 mL
Explanation of why this is the correct answer:
To prepare a 50% solution of Ensure from a full-strength can, the nurse needs to calculate the volume of full-strength Ensure required to make 280 mL of the 50% solution.
Full-strength Ensure is available in 240 mL cans, and we need to prepare 280 mL of a 50% solution.
For a 50% solution, you would need to mix half of the total volume with full-strength Ensure and half with water (or an appropriate diluent).
Calculate the amount of full-strength Ensure:
0.5 × 280 mL = 140 mL of full-strength Ensure.
Why the other options are incorrect:
B. 150 mL: This is incorrect because the correct calculation results in 140 mL of full-strength Ensure.
C. 135 mL: This is incorrect because the amount required to prepare a 50% solution is 140 mL, not 135 mL.
D. 120 mL: This is incorrect because the correct volume is 140 mL, not 120 mL.
Summary: To prepare 280 mL of a 50% solution, the nurse should use 140 mL of full-strength Ensure.
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:
-
0.14
-
1.4
-
14
-
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.
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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.