ATI Dosage Calculation
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Free ATI Dosage Calculation Questions
A nurse is preparing to administer 7.5 mL of ampicillin 250 mg oral suspension to a toddler who has otitis media. The nurse should recognize that 7.5 mL is equivalent to how many tsp? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
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1 tsp
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1.2 tsp
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1.5 tsp
-
2 tsp
Explanation
Correct answer: C. 1.5 tsp
Detailed explanation of the correct answer:
To convert from milliliters (mL) to teaspoons (tsp), use the standard conversion:
1 tsp = 5 mL
Given that the nurse is preparing to administer 7.5 mL of ampicillin, the calculation is:
7.5 mL ÷ 5 mL/tsp = 1.5 tsp
Explanation of why the other options are incorrect:
A. 1 tsp = 5 mL, which is too little for the prescribed 7.5 mL dose.
B. 1.2 tsp = 6 mL, which is still too little.
D. 2 tsp = 10 mL, which is more than the prescribed 7.5 mL.
Summary:
To administer 7.5 mL of medication, the nurse should instruct that this is equal to 1.5 teaspoons (tsp).
The physician has ordered Haldol 0.5 mg IV every 2 hours prn for agitation. The Haldol is available in 5 mg per 1-mL vials. How many milliliters would the nurse administer with each dose? Round to the nearest tenth_
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0.1 mL
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0.2 mL
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0.5 mL
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1 mL
Explanation
Correct answer: A. 0.1 mL
Detailed explanation of the correct answer:
To calculate the volume of Haldol the nurse should administer:
Identify the dose and concentration
The physician ordered 0.5 mg, and the Haldol is supplied in 5 mg/mL vials.
Apply the formula to calculate the volume
Volume (mL) = Dose required ÷ Concentration
Now, plug in the values:
Volume = 0.5 mg ÷ 5 mg/mL = 0.1 mL
Explanation of why the other options are incorrect:
B. 0.2 mL is incorrect because it would result in administering a dose of 1 mg, which is higher than the prescribed 0.5 mg.
C. 0.5 mL is incorrect because it would result in administering a dose of 2.5 mg, which is too much.
D. 1 mL is incorrect because it would result in administering a dose of 5 mg, which is too much.
Summary:
The nurse should administer 0.1 mL of Haldol with each dose to meet the prescribed 0.5 mg.
A client who has preeclampsia receives a prescription for an IV infusion of 0.9% normal saline with magnesium sulfate 4 gram/250 ml to be infused at a rate of 125 ml/hour. The nurse should administer how many mg/hour of magnesium sulfate? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
-
1000 mg/hour
-
1500 mg/hour
-
2000 mg/hour
-
2500 mg/hour
Explanation
Correct Answer:
C. 2000 mg/hour
Explanation of Correct Answer:
The infusion contains 4 grams of magnesium sulfate in 250 mL.
To find the concentration in mg/mL, convert 4 grams to milligrams:
4 grams = 4000 mg.
Now, calculate the concentration:
4000 mg ÷ 250 mL = 16 mg/mL.
The infusion is being delivered at a rate of 125 mL/hour.
To calculate the amount of magnesium sulfate administered per hour:
125 mL/hour × 16 mg/mL = 2000 mg/hour.
Why the Other Options are Incorrect:
A. 1000 mg/hour is incorrect because it represents half of the correct dose.
B. 1500 mg/hour is incorrect because it is not the correct dosage based on the infusion rate and concentration.
D. 2500 mg/hour is incorrect because it exceeds the correct dosage required.
Summary:
The nurse should administer 2000 mg/hour of magnesium sulfate based on the prescribed infusion rate and concentration. The correct answer is C. 2000 mg/hour.
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.
A patient has labetalol 10 mg IV every 2 hours prn for systolic blood pressure more than 180 mm Hg. The medication is available in 20 mg per 1-mL vials. How many milliliters would the nurse administer with each dose? Round to the nearest tenth
-
0.2 mL
-
0.5 mL
-
1.0 mL
-
1.5 mL
Explanation
Correct answer: B. 0.5 mL
Detailed explanation of the correct answer:
To calculate the volume of labetalol to administer, we use the formula:
Volume (mL) = Desired dose (mg) ÷ Concentration (mg/mL)
Given:
Desired dose = 10 mg
Concentration = 20 mg/mL
Volume = 10 mg ÷ 20 mg/mL = 0.5 mL
Explanation of why the other options are incorrect:
A. 0.2 mL is incorrect because it would correspond to a dose of 4 mg, not the prescribed 10 mg.
C. 1.0 mL is incorrect because it would correspond to a dose of 20 mg, which is double the prescribed dose of 10 mg.
D. 1.5 mL is incorrect because it would correspond to a dose of 30 mg, which exceeds the prescribed dose.
Summary:
The nurse should administer 0.5 mL of labetalol for each dose to deliver the prescribed 10 mg.
A client is receiving acetaminophen (Tylenol) 0.65 gram PO every 6 hours PRN for pain. Acetaminophen is available in 325 mg tablets. How many milligrams should the nurse administer? (Enter numeric value only.)
-
325 mg
-
500 mg
-
650 mg
-
750 mg
Explanation
Correct Answer:
C. 650 mg
Explanation of Correct Answer:
First, convert 0.65 grams to milligrams:
0.65 grams = 650 mg.
Therefore, the nurse should administer 650 mg of acetaminophen, as the prescribed dose is 0.65 grams.
Why the Other Options are Incorrect:
A. 325 mg is incorrect because it is half the required dose.
B. 500 mg is incorrect because it is less than the prescribed dose of 650 mg.
D. 750 mg is incorrect because it exceeds the required dose of 650 mg.
Summary:
The nurse should administer 650 mg of acetaminophen (Tylenol). The correct answer is C. 650 mg.
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
-
1
-
2
-
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.
Mrs. Monroe weighs 165 lb and is prescribed a med with a dosage of 0.8 mg/kg in 2 divided doses. How many milligrams will Mrs. Monroe receive per day?
Select one:
-
30 mg
-
60 mg
-
90 mg
-
120 mg
Explanation
Correct Answer:
B. 60 mg
Explanation of Correct Answer:
Convert Mrs. Monroe’s weight from pounds to kilograms:
165 lb ÷ 2.2 = 75 kg.
Calculate the total dosage per day:
0.8 mg × 75 kg = 60 mg per day.
Since the dosage is given in two divided doses, the total daily dose is still 60 mg.
Why the Other Options are Incorrect:
A. 30 mg is incorrect because it is half of the correct daily dose, but the total dose is 60 mg per day.
C. 90 mg is incorrect as it exceeds the correct total dosage for Mrs. Monroe.
D. 120 mg is incorrect as it is too high for the prescribed dosage.
Summary:
Mrs. Monroe will receive 60 mg of the medication per day. The correct answer is B. 60 mg.
The healthcare provider prescribes ganciclovir 375 mg IV every 12 hour to infuse over 90 minutes. The pharmacy delivers ganciclovir 375 mg in a 150 mL IV bag. How many drops/minute should the nurse regulate the gravity infusion using a drip chamber that delivers 10 drops/mL? (Enter numerical value only. If rounding is required, round to the nearest whole number.)
-
10 drops/min
-
15 drops/min
-
17 drops/min
-
20 drops/min
Explanation
Correct Answer: C. 17 drops/min
Why this answer is correct:
To calculate the number of drops per minute, first determine the total infusion time in minutes and then use the drip rate formula: Total infusion time = 90 minutes.
The total volume of the IV bag is 150 mL. The drip factor is 10 drops/mL.
Now calculate the drip rate:
Drip rate = (Total volume ÷ Total infusion time) × Drip factor
Drip rate = (150 mL ÷ 90 minutes) × 10 drops/mL
Drip rate = 1.67 mL/min × 10 drops/mL
Drip rate = 16.7 drops/min, rounded to 17 drops/min.
Why the other options are wrong:
A. 10 drops/min – This would deliver less fluid per minute, taking longer to complete the infusion and potentially underdosing the client.
B. 15 drops/min – This would deliver 15 mL every minute, resulting in too fast an infusion and potentially risking side effects or insufficient time for proper absorption.
D. 20 drops/min – This would be too rapid of a rate, leading to a faster infusion than prescribed, which may lead to adverse effects.
Summary:
The infusion requires 150 mL to be delivered over 90 minutes. The correct drip rate is calculated to be 17 drops/min, which is the ideal rate. Therefore, the nurse should regulate the infusion pump at C. 17 drops/min.
A client is receiving an IV solution of 2 grams of medication diluted in 100 ml of normal saline over a one hour time period. How many mg of medication is the client receiving per minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
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33 mg/min
-
30 mg/min
-
40 mg/min
-
50 mg/min
Explanation
Correct Answer:
A. 33 mg/min
Explanation of Correct Answer:
First, convert 2 grams to milligrams:
2 grams = 2,000 mg.
The total volume is 100 mL, and the medication is being infused over a 60-minute period.
To find the rate of medication administration per minute, divide the total amount of medication by the time:
2,000 mg ÷ 60 minutes = 33.33 mg/min.
Rounding to the nearest whole number, the client is receiving 33 mg/min.
Why the Other Options are Incorrect:
B. 30 mg/min is incorrect because it underestimates the correct rate of administration.
C. 40 mg/min is incorrect because it overestimates the correct rate.
D. 50 mg/min is incorrect because it significantly overestimates the correct rate.
Summary:
The client is receiving 33 mg/min of medication. The correct answer is A. 33 mg/min.
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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.