ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
The healthcare provider prescribes phytonadione (AquaMEPHYTON) 250 mcg IM to be administered to an infant within 1 hour of admission to the nursery. A 0.5 ml ampule labeled 2 mg in 1 ml is available. The nurse should administer how many ml? (Enter numeric value only. If rounding is required, round to the nearest hundredth.) Change mcg to mg, 1000 mcg = 1 mgUse ratio and proportion to calculate the dose: 2 mg : 1
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0.13 mL
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0.15 mL
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0.18 mL
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0.20 mL
Explanation
Correct Answer:
A. 0.13 mL
Explanation of Correct Answer:
First, convert 250 mcg to mg, since 1 mg = 1,000 mcg:
250 mcg = 0.25 mg.
Next, use the ratio and proportion method to calculate the volume needed. The available concentration is 2 mg in 1 mL.
The proportion is set up as follows:
2 mg / 1 mL = 0.25 mg / x mL
Now, solve for x:
x = (0.25 mg × 1 mL) / 2 mg
x = 0.25 / 2
x = 0.125 mL
Rounded to the nearest hundredth, the volume to administer is 0.13 mL.
Why the Other Options are Incorrect:
B. 0.15 mL is incorrect because it overestimates the required volume based on the available concentration.
C. 0.18 mL is incorrect because it would be too high for the prescribed dose.
D. 0.20 mL is incorrect because it exceeds the correct calculated volume.
Summary:
The nurse should administer 0.13 mL based on the prescribed dose of 250 mcg (0.25 mg) and the available concentration of 2 mg/mL. The correct answer is A. 0.13 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.
The nurse needs to calculate a client's oral temperature of 99.2 degrees Fahrenheit to Celsius. What temperature in Celsius should the nurse document? (Enter numeric value only. Round to the nearest tenth.)
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37.1°C
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37.2°C
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37.3°C
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37.4°C
Explanation
Correct Answer:
C. 37.3°C
Explanation of Correct Answer:
To convert Fahrenheit to Celsius, use the formula:
°C = (°F - 32) × 5/9.
Substitute 99.2°F into the formula:
°C = (99.2 - 32) × 5/9
°C = 67.2 × 5/9
°C = 336 / 9
°C = 37.3°C.
Why the Other Options are Incorrect:
A. 37.1°C is incorrect because it is too low, rounding too early in the calculation.
B. 37.2°C is incorrect because it doesn’t reflect the accurate conversion.
D. 37.4°C is incorrect because it overestimates the correct conversion.
Summary:
The client's temperature of 99.2°F converts to 37.3°C. The correct answer is C. 37.3°C.
A client with a renal calculi receives a prescription for an IV infusion of 0.9% sodium chloride 1,000 mL to be infused over 2.5 hours. The nurse should program the infusion pump to deliver how many mL/hour? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
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105 mg
-
115 mg
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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.
The nurse programs an IV infusion pump of Ringer's Lactated 1,000 ml with oxytocin (Pitocin) 40 units to be delivered at 15 ml/hour. How many milliunits/minute is the client receiving? (Enter numeric value only, whole number.)
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10 milliunits/minute
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15 milliunits/minute
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20 milliunits/minute
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25 milliunits/minute
Explanation
Correct Answer:
A. 10 milliunits/minute
Explanation of Correct Answer:
To calculate the number of milliunits per minute, we first calculate the concentration of oxytocin in the IV solution. The total amount of oxytocin is 40 units in 1,000 mL, and since 1 unit = 1,000 milliunits, the total amount of oxytocin is 40,000 milliunits.
This gives a concentration of 40,000 milliunits ÷ 1,000 mL = 40 milliunits/mL.
The infusion rate is 15 mL/hour.
To find the number of milliunits delivered per hour, multiply the concentration by the infusion rate:
15 mL/hour × 40 milliunits/mL = 600 milliunits/hour.
Now, convert from hourly to minute delivery:
600 milliunits/hour ÷ 60 minutes = 10 milliunits/minute.
Thus, the client is receiving 10 milliunits/minute.
Why the Other Options are Incorrect:
B. 15 milliunits/minute is incorrect because it would result from a higher infusion rate or a different concentration.
C. 20 milliunits/minute is incorrect because it suggests a higher infusion rate or concentration.
D. 25 milliunits/minute is incorrect because it represents an even higher rate than required.
Summary:
The client is receiving 10 milliunits/minute based on the infusion rate and concentration of oxytocin. The correct answer is A. 10 milliunits/minute.
You receive the following order:
Heparin 10,000 units in 1L D5NS
Your pharmacy is out of heparin 10,000 units/mL. How many milliliters will you dispense of heparin 5,000 units/mL?
Select one:
-
0.5
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1
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2
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20
Explanation
Correct Answer:
C. 2
Explanation of Correct Answer:
Identify the required dose and concentration:
The order is for 10,000 units to be added to 1 liter (1,000 mL) of D5NS.
The available heparin is 5,000 units/mL.
Set up the equation to find the volume required:
To achieve the total dose of 10,000 units, we need to determine how many milliliters of the 5,000 units/mL concentration are needed.
Volume (mL) = Total Dose (units) ÷ Concentration (units/mL)
Substitute the known values:
Volume = 10,000 units ÷ 5,000 units/mL
Volume = 2 mL
Why the Other Options are Incorrect:
A. 0.5 mL would be insufficient to provide the 10,000 units required.
B. 1 mL would only provide 5,000 units, which is half of the required dose.
D. 20 mL would be much too large, as it would provide 100,000 units, which is 10 times the required dose.
Summary:
To administer 10,000 units of heparin with a concentration of 5,000 units/mL, you will need to dispense 2 mL. The correct answer is C. 2.
A child who weighs 13 pounds receives a prescription for amoxicillin 25 mg/kg/day by mouth (PO) in divided doses every 12 hours. The bottle is labeled, "Amoxicillin for Oral Suspension, USP 125 mg per 5 mL." How many mL should the nurse instruct the caregiver to administer with each dose? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
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3 mL
-
6 mL
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5 mL
-
4 mL
Explanation
Correct Answer: A. 3 mL
Detailed Explanation of the Correct Answer:
Step 1: Convert the child’s weight from pounds to kilograms.
13 lb ÷ 2.2 = 5.91 kg
Step 2: Calculate the total daily dose.
25 mg/kg/day × 5.91 kg = 147.75 mg/day
Step 3: Since the medication is prescribed every 12 hours, divide the total daily dose into 2 doses:
147.75 mg ÷ 2 = 73.875 mg per dose
Step 4: Determine how many mg are in 1 mL of the suspension.
125 mg ÷ 5 mL = 25 mg/mL
Step 5: Calculate how many mL are needed to deliver 73.875 mg:
73.875 mg ÷ 25 mg/mL = 2.955 mL
Step 6: Round to the nearest whole number:
≈ 3 mL
Explanation of Incorrect Options:
B. 6 mL is too high and would deliver 150 mg per dose, which is double the needed amount.
C. 5 mL would provide 125 mg, which is too much for each dose.
D. 4 mL provides 100 mg, which still exceeds the required 73.875 mg dose.
Summary:
The child weighs 5.91 kg, and the prescribed amoxicillin dose (25 mg/kg/day divided twice daily) results in a dose of approximately 73.875 mg per administration. At a concentration of 25 mg/mL, the correct volume per dose is 3 mL.
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.)
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16.8 mL
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18.5 mL
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20 mL
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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.
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
-
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.
The physician has ordered an Inocor drip at 5 mcg/kg/min for a patient with congestive heart failure. The Inocor concentration is 500 mg/250 mL D5W. How many milliliters per hour should the Inocor infuse for a patient weighing 64 kg. Round answer to nearest tenth
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5.3 mL/hr
-
9.6 mL/hr
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12.8 mL/hr
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15.0 mL/hr
Explanation
Correct answer: B. 9.6 mL/hr
Detailed explanation of the correct answer:
To calculate the flow rate in mL/hr for the Inocor infusion:
Determine the required dose in mcg/min
The physician has ordered 5 mcg/kg/min, and the patient weighs 64 kg.
Dose (mcg/min) = 5 mcg/kg/min × 64 kg = 320 mcg/min
Convert mcg to mg
Since 1 mg = 1000 mcg, we convert 320 mcg to mg:
320 mcg/min = 0.32 mg/min
Determine the flow rate in mL/min
The concentration of Inocor is 500 mg/250 mL, which equals:
Concentration = 500 mg ÷ 250 mL = 2 mg/mL
Now, calculate the flow rate in mL/min:
Flow rate (mL/min) = 0.32 mg/min ÷ 2 mg/mL = 0.16 mL/min
Convert mL/min to mL/hr
Since 1 hour = 60 minutes, we multiply by 60:
Flow rate (mL/hr) = 0.16 mL/min × 60 min/hr = 9.6 mL/hr
Explanation of why the other options are incorrect:
A. 5.3 mL/hr is incorrect because it underestimates the correct flow rate.
C. 12.8 mL/hr is incorrect because it overestimates the correct flow rate.
D. 15.0 mL/hr is incorrect because it significantly overestimates the flow rate.
Summary:
The correct flow rate for the Inocor infusion is 9.6 mL/hr.
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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.