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Maternal-Child Nursing: Dosage Calculation | ATI
Proctored Assessment Newest Exam Preparation With
Complete Questions And Correct Answers With Rationales
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Question 1
A nurse is preparing to administer ampicillin 50 mg/kg/day divided
equally every 6 hours to a child who weighs 22 lb. The medication is
available in a concentration of 125 mg/5 mL. How many mL should the
nurse administer per dose?
A) 2 mL
B) 4 mL
C) 5 mL
D) 10 mL
Correct Answer: C) 5 mL
Explanation: First convert weight to kilograms: 22 lb divided by 2.2
equals 10 kg. The total daily dose is 50 mg/kg multiplied by 10 kg, which
equals 500 mg per day. Because the medication is given every 6 hours,
there are 4 doses per day, so each dose is 500 mg divided by 4, equaling
125 mg. The concentration is 125 mg per 5 mL, so the volume per dose
is 5 mL.
Question 2
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A newborn is prescribed vitamin K 1 mg subcutaneously. The vial
contains 2 mg/mL. How many mL should the nurse administer?
A) 0.25 mL
B) 0.5 mL
C) 1 mL
D) 2 mL
Correct Answer: B) 0.5 mL
Explanation: Use the formula desired dose divided by available dose
multiplied by volume. One milligram divided by 2 mg per mL equals 0.5
mL. This is the standard prophylactic dose for newborns to prevent
hemorrhagic disease.
Question 3
A child weighing 44 lb is ordered cefazolin 15 mg/kg IV every 8 hours.
The pharmacy supplies a vial of 500 mg powder to be reconstituted to a
concentration of 100 mg/mL. How many mL per dose?
A) 3 mL
B) 4.5 mL
C) 6 mL
D) 9 mL
Correct Answer: A) 3 mL
Explanation: Convert pounds to kilograms by dividing 44 by 2.2, which
equals 20 kg. The dose is 15 mg/kg multiplied by 20 kg, giving 300 mg
per dose. With a concentration of 100 mg/mL, the required volume is
300 mg divided by 100 mg/mL, which equals 3 mL.
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Question 4
A nurse is to administer 40 mEq of potassium chloride in 1000 mL of IV
fluid over 24 hours. The IV tubing has a drop factor of 15 gtt/mL. What
is the infusion rate in drops per minute?
A) 10 gtt/min
B) 15 gtt/min
C) 20 gtt/min
D) 25 gtt/min
Correct Answer: A) 10 gtt/min
Explanation: The flow rate is 1000 mL divided by 24 hours, which equals
41.67 mL per hour. To convert to drops per minute, multiply 41.67
mL/hr by 15 gtt/mL and divide by 60 minutes, resulting in
approximately 10.4, which rounds to 10 gtt/min.
Question 5
An infant weighing 7.2 kg is prescribed digoxin 10 mcg/kg/day divided
into two doses. The elixir is 0.05 mg/mL. How many mL per dose?
A) 0.36 mL
B) 0.72 mL
C) 1.44 mL
D) 2.88 mL
Correct Answer: B) 0.72 mL
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Explanation: The total daily dose is 10 mcg/kg multiplied by 7.2 kg,
which equals 72 mcg. Divided into two doses gives 36 mcg per dose.
Convert 36 mcg to milligrams by dividing by 1000, giving 0.036 mg.
With a concentration of 0.05 mg/mL, the volume is 0.036 mg divided by
0.05 mg/mL, equaling 0.72 mL.
Question 6
A client in active labor is receiving oxytocin IV at 6 mU/min. The IV bag
contains 30 units of oxytocin in 500 mL of normal saline. What is the
infusion rate in mL/hour?
A) 6 mL/hr
B) 12 mL/hr
C) 18 mL/hr
D) 24 mL/hr
Correct Answer: A) 6 mL/hr
Explanation: The concentration is 30 units per 500 mL, which equals
0.06 units per mL or 60 mU per mL. To deliver 6 mU/min, the rate is 6
mU/min divided by 60 mU/mL, giving 0.1 mL/min. Multiplying by 60
minutes yields 6 mL/hr.
Question 7
A nurse is calculating the intake for a postpartum client. The client
drank 8 oz of water, 6 oz of broth, and 4 oz of gelatin. What is the total
intake in mL?
A) 360 mL
Maternal-Child Nursing: Dosage Calculation | ATI
Proctored Assessment Newest Exam Preparation With
Complete Questions And Correct Answers With Rationales
Already Graded A+ Brand New Version!!
Question 1
A nurse is preparing to administer ampicillin 50 mg/kg/day divided
equally every 6 hours to a child who weighs 22 lb. The medication is
available in a concentration of 125 mg/5 mL. How many mL should the
nurse administer per dose?
A) 2 mL
B) 4 mL
C) 5 mL
D) 10 mL
Correct Answer: C) 5 mL
Explanation: First convert weight to kilograms: 22 lb divided by 2.2
equals 10 kg. The total daily dose is 50 mg/kg multiplied by 10 kg, which
equals 500 mg per day. Because the medication is given every 6 hours,
there are 4 doses per day, so each dose is 500 mg divided by 4, equaling
125 mg. The concentration is 125 mg per 5 mL, so the volume per dose
is 5 mL.
Question 2
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A newborn is prescribed vitamin K 1 mg subcutaneously. The vial
contains 2 mg/mL. How many mL should the nurse administer?
A) 0.25 mL
B) 0.5 mL
C) 1 mL
D) 2 mL
Correct Answer: B) 0.5 mL
Explanation: Use the formula desired dose divided by available dose
multiplied by volume. One milligram divided by 2 mg per mL equals 0.5
mL. This is the standard prophylactic dose for newborns to prevent
hemorrhagic disease.
Question 3
A child weighing 44 lb is ordered cefazolin 15 mg/kg IV every 8 hours.
The pharmacy supplies a vial of 500 mg powder to be reconstituted to a
concentration of 100 mg/mL. How many mL per dose?
A) 3 mL
B) 4.5 mL
C) 6 mL
D) 9 mL
Correct Answer: A) 3 mL
Explanation: Convert pounds to kilograms by dividing 44 by 2.2, which
equals 20 kg. The dose is 15 mg/kg multiplied by 20 kg, giving 300 mg
per dose. With a concentration of 100 mg/mL, the required volume is
300 mg divided by 100 mg/mL, which equals 3 mL.
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Question 4
A nurse is to administer 40 mEq of potassium chloride in 1000 mL of IV
fluid over 24 hours. The IV tubing has a drop factor of 15 gtt/mL. What
is the infusion rate in drops per minute?
A) 10 gtt/min
B) 15 gtt/min
C) 20 gtt/min
D) 25 gtt/min
Correct Answer: A) 10 gtt/min
Explanation: The flow rate is 1000 mL divided by 24 hours, which equals
41.67 mL per hour. To convert to drops per minute, multiply 41.67
mL/hr by 15 gtt/mL and divide by 60 minutes, resulting in
approximately 10.4, which rounds to 10 gtt/min.
Question 5
An infant weighing 7.2 kg is prescribed digoxin 10 mcg/kg/day divided
into two doses. The elixir is 0.05 mg/mL. How many mL per dose?
A) 0.36 mL
B) 0.72 mL
C) 1.44 mL
D) 2.88 mL
Correct Answer: B) 0.72 mL
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Explanation: The total daily dose is 10 mcg/kg multiplied by 7.2 kg,
which equals 72 mcg. Divided into two doses gives 36 mcg per dose.
Convert 36 mcg to milligrams by dividing by 1000, giving 0.036 mg.
With a concentration of 0.05 mg/mL, the volume is 0.036 mg divided by
0.05 mg/mL, equaling 0.72 mL.
Question 6
A client in active labor is receiving oxytocin IV at 6 mU/min. The IV bag
contains 30 units of oxytocin in 500 mL of normal saline. What is the
infusion rate in mL/hour?
A) 6 mL/hr
B) 12 mL/hr
C) 18 mL/hr
D) 24 mL/hr
Correct Answer: A) 6 mL/hr
Explanation: The concentration is 30 units per 500 mL, which equals
0.06 units per mL or 60 mU per mL. To deliver 6 mU/min, the rate is 6
mU/min divided by 60 mU/mL, giving 0.1 mL/min. Multiplying by 60
minutes yields 6 mL/hr.
Question 7
A nurse is calculating the intake for a postpartum client. The client
drank 8 oz of water, 6 oz of broth, and 4 oz of gelatin. What is the total
intake in mL?
A) 360 mL
