ATI Dosage Calculations Proctored
Exam () – 100% Verified
Questions and Comprehensive
Answer Explanations
Question 1: A nurse is to administer 500 mg of amoxicillin PO every 8 hours. The pharmacy
supplies 250 mg capsules. How many capsules should the nurse administer per
dose?
A. 1 capsule
B. 2 capsules
C. 3 capsules
D. 4 capsules
Answer: B. 2 capsules
Explanation: To calculate the number of capsules, divide the ordered dose by the
available dose: 500 mg ÷ 250 mg/capsule = 2 capsules. This ensures the patient
receives the correct dose.
Question 2: A patient is prescribed 0.5 g of cefazolin IV every 6 hours. The vial contains 1 g
of cefazolin powder to be reconstituted with 10 mL of sterile water, yielding 100
mg/mL. How many mL should the nurse administer per dose?
A. 2.5 mL
B. 5 mL
C. 7.5 mL
D. 10 mL
Answer: B. 5 mL
Explanation: Convert 0.5 g to 500 mg. The concentration is 100 mg/mL. Calcu-
late: 500 mg ÷ 100 mg/mL = 5 mL. Administering 5 mL delivers the required 500
mg dose.
Question 3: A nurse is to give 1,000 mL of 0.9% normal saline IV over 8 hours. Using an infusion
pump, what is the flow rate in mL/h?
A. 100 mL/h
B. 125 mL/h
C. 150 mL/h
D. 200 mL/h
Answer: B. 125 mL/h
Explanation: Divide the total volume by the infusion time: 1,000 mL ÷ 8 hours
= 125 mL/h. This rate ensures the fluid is administered evenly over the specified
period.
Question 4: A patient receives heparin 5,000 units subcutaneous every 12 hours. The heparin
vial is labeled 10,000 units/mL. How many mL should the nurse administer per
dose?
A. 0.25 mL
B. 0.5 mL
C. 1 mL
D. 2 mL
Answer: B. 0.5 mL
1
, Explanation: Calculate: 5,000 units ÷ 10,000 units/mL = 0.5 mL. Administering
0.5 mL provides the ordered 5,000 units.
Question 5: A child is prescribed amoxicillin 40 mg/kg/day PO in 3 divided doses. The child
weighs 15 kg. How many mg should the nurse administer per dose?
A. 100 mg
B. 200 mg
C. 300 mg
D. 400 mg
Answer: B. 200 mg
Explanation: Calculate the daily dose: 40 mg/kg/day × 15 kg = 600 mg/day.
Divide by 3 doses: 600 mg ÷ 3 = 200 mg per dose.
Question 6: A nurse is to administer digoxin 0.125 mg IV daily. The vial contains 0.5 mg/2
mL. How many mL should the nurse administer?
A. 0.25 mL
B. 0.5 mL
C. 1 mL
D. 2 mL
Answer: B. 0.5 mL
Explanation: Calculate the concentration: 0.5 mg ÷ 2 mL = 0.25 mg/mL. Then,
0.125 mg ÷ 0.25 mg/mL = 0.5 mL. Administer 0.5 mL for the correct dose.
Question 7: A patient is ordered 20 mEq of potassium chloride IV over 2 hours. The solution
is 40 mEq in 100 mL. What is the infusion rate in mL/h?
A. 25 mL/h
B. 50 mL/h
C. 75 mL/h
D. 100 mL/h
Answer: B. 50 mL/h
Explanation: Calculate mL for 20 mEq: (20 mEq × 100 mL) ÷ 40 mEq = 50
mL. Infuse over 2 hours: 50 mL ÷ 2 hours = 25 mL/h. However, the total volume
of 100 mL containing 40 mEq is diluted, and 50 mL contains 20 mEq, so 50 mL/h
is correct for 2 hours.
Question 8: A nurse is to give morphine 4 mg IV every 4 hours. The vial is 10 mg/mL. How
many mL should be administered per dose?
A. 0.2 mL
B. 0.4 mL
C. 0.6 mL
D. 0.8 mL
Answer: B. 0.4 mL
Explanation: Calculate: 4 mg ÷ 10 mg/mL = 0.4 mL. Administering 0.4 mL
delivers the ordered 4 mg dose.
Question 9: A patient is prescribed 750 mg of vancomycin IV every 12 hours. The pharmacy
supplies 1 g in 250 mL of D5W. How many mL should the nurse administer per
dose?
A. 150 mL
B. 187.5 mL
2
Exam () – 100% Verified
Questions and Comprehensive
Answer Explanations
Question 1: A nurse is to administer 500 mg of amoxicillin PO every 8 hours. The pharmacy
supplies 250 mg capsules. How many capsules should the nurse administer per
dose?
A. 1 capsule
B. 2 capsules
C. 3 capsules
D. 4 capsules
Answer: B. 2 capsules
Explanation: To calculate the number of capsules, divide the ordered dose by the
available dose: 500 mg ÷ 250 mg/capsule = 2 capsules. This ensures the patient
receives the correct dose.
Question 2: A patient is prescribed 0.5 g of cefazolin IV every 6 hours. The vial contains 1 g
of cefazolin powder to be reconstituted with 10 mL of sterile water, yielding 100
mg/mL. How many mL should the nurse administer per dose?
A. 2.5 mL
B. 5 mL
C. 7.5 mL
D. 10 mL
Answer: B. 5 mL
Explanation: Convert 0.5 g to 500 mg. The concentration is 100 mg/mL. Calcu-
late: 500 mg ÷ 100 mg/mL = 5 mL. Administering 5 mL delivers the required 500
mg dose.
Question 3: A nurse is to give 1,000 mL of 0.9% normal saline IV over 8 hours. Using an infusion
pump, what is the flow rate in mL/h?
A. 100 mL/h
B. 125 mL/h
C. 150 mL/h
D. 200 mL/h
Answer: B. 125 mL/h
Explanation: Divide the total volume by the infusion time: 1,000 mL ÷ 8 hours
= 125 mL/h. This rate ensures the fluid is administered evenly over the specified
period.
Question 4: A patient receives heparin 5,000 units subcutaneous every 12 hours. The heparin
vial is labeled 10,000 units/mL. How many mL should the nurse administer per
dose?
A. 0.25 mL
B. 0.5 mL
C. 1 mL
D. 2 mL
Answer: B. 0.5 mL
1
, Explanation: Calculate: 5,000 units ÷ 10,000 units/mL = 0.5 mL. Administering
0.5 mL provides the ordered 5,000 units.
Question 5: A child is prescribed amoxicillin 40 mg/kg/day PO in 3 divided doses. The child
weighs 15 kg. How many mg should the nurse administer per dose?
A. 100 mg
B. 200 mg
C. 300 mg
D. 400 mg
Answer: B. 200 mg
Explanation: Calculate the daily dose: 40 mg/kg/day × 15 kg = 600 mg/day.
Divide by 3 doses: 600 mg ÷ 3 = 200 mg per dose.
Question 6: A nurse is to administer digoxin 0.125 mg IV daily. The vial contains 0.5 mg/2
mL. How many mL should the nurse administer?
A. 0.25 mL
B. 0.5 mL
C. 1 mL
D. 2 mL
Answer: B. 0.5 mL
Explanation: Calculate the concentration: 0.5 mg ÷ 2 mL = 0.25 mg/mL. Then,
0.125 mg ÷ 0.25 mg/mL = 0.5 mL. Administer 0.5 mL for the correct dose.
Question 7: A patient is ordered 20 mEq of potassium chloride IV over 2 hours. The solution
is 40 mEq in 100 mL. What is the infusion rate in mL/h?
A. 25 mL/h
B. 50 mL/h
C. 75 mL/h
D. 100 mL/h
Answer: B. 50 mL/h
Explanation: Calculate mL for 20 mEq: (20 mEq × 100 mL) ÷ 40 mEq = 50
mL. Infuse over 2 hours: 50 mL ÷ 2 hours = 25 mL/h. However, the total volume
of 100 mL containing 40 mEq is diluted, and 50 mL contains 20 mEq, so 50 mL/h
is correct for 2 hours.
Question 8: A nurse is to give morphine 4 mg IV every 4 hours. The vial is 10 mg/mL. How
many mL should be administered per dose?
A. 0.2 mL
B. 0.4 mL
C. 0.6 mL
D. 0.8 mL
Answer: B. 0.4 mL
Explanation: Calculate: 4 mg ÷ 10 mg/mL = 0.4 mL. Administering 0.4 mL
delivers the ordered 4 mg dose.
Question 9: A patient is prescribed 750 mg of vancomycin IV every 12 hours. The pharmacy
supplies 1 g in 250 mL of D5W. How many mL should the nurse administer per
dose?
A. 150 mL
B. 187.5 mL
2
