ATI Dosage Calculation PN Adult Medical Surgical Proctored
Assessment 3.2 | 200 Practice Questions & Detailed Answers |
NGNReady Q&A | A+ Graded
QUESTION 1
A nurse is preparing to administer phenobarbital 5 mg/kg/day PO divided in equal doses every 12 hours
to a client who weighs 44 lb. Available is phenobarbital elixir 20 mg/5 mL. How many mL should the
nurse administer per dose? (Round to the nearest whole number.)
A) 10 mL
B) 13 mL
C) 15 mL
D) 18 mL
Answer: B
Explanation: Convert weight: 44 lb ÷ 2.2 = 20 kg. Daily dose: 5 mg/kg × 20 kg = 100 mg/day. Divided
q12h: 100 mg ÷ 2 = 50 mg/dose. Using the available concentration: (20 mg/5 mL) = (50 mg/X mL) → X =
(50 × 5) ÷ 20 = 12.5 mL → round to 13 mL.
QUESTION 2
A nurse is preparing to administer gentamicin 2 mg/kg IV every 8 hours to a client weighing 132 lb.
Available is gentamicin 40 mg/mL. How many mL should the nurse administer per dose?
A) 1 mL
B) 2 mL
C) 3 mL
D) 4 mL
,Answer: C
Explanation: Convert weight: 132 lb ÷ 2.2 = 60 kg. Dose: 2 mg/kg × 60 kg = 120 mg. Volume: 120 mg ÷ 40
mg/mL = 3 mL.
QUESTION 3
A nurse is preparing to administer heparin 12,000 units subcutaneously every 12 hours. Available is
heparin 20,000 units/mL. How many mL should the nurse administer?
A) 0.3 mL
B) 0.6 mL
C) 1.2 mL
D) 2.0 mL
Answer: B
Explanation: Volume = 12,000 units ÷ 20,000 units/mL = 0.6 mL.
QUESTION 4
A nurse is preparing to administer amoxicillin 30 mg/kg/day PO divided in equal doses every 12 hours to
a client weighing 55 lb. Available is amoxicillin 400 mg/5 mL. How many mL should the nurse administer
per dose? (Round to the nearest whole number.)
A) 3 mL
B) 4 mL
,C) 5 mL
D) 6 mL
Answer: C
Explanation: Convert weight: 55 lb ÷ 2.2 = 25 kg. Daily dose: 30 mg/kg × 25 kg = 750 mg/day. Divided
q12h: 750 mg ÷ 2 = 375 mg/dose. Volume: (400 mg/5 mL) = (375 mg/X mL) → X = (375 × 5) ÷ 400 =
4.6875 mL → round to 5 mL.
QUESTION 5
A nurse is preparing to administer furosemide 60 mg IV push. Available is furosemide 10 mg/mL. How
many mL should the nurse administer?
A) 4 mL
B) 5 mL
C) 6 mL
D) 8 mL
Answer: C
Explanation: Volume = 60 mg ÷ 10 mg/mL = 6 mL.
QUESTION 6
A nurse is preparing to administer digoxin 0.25 mg PO daily. Available is digoxin elixir 0.05 mg/mL. How
many mL should the nurse administer?
, A) 2 mL
B) 3 mL
C) 4 mL
D) 5 mL
Answer: D
Explanation: Volume = 0.25 mg ÷ 0.05 mg/mL = 5 mL.
QUESTION 7
A provider orders cefazolin 500 mg IV every 8 hours. The pharmacy sends a vial labeled 1 g powder. The
reconstitution instructions state: "Add 2.5 mL sterile water to yield 330 mg/mL." How many mL should
the nurse administer? (Round to the nearest tenth.)
A) 1.0 mL
B) 1.5 mL
C) 2.0 mL
D) 2.5 mL
Answer: B
Explanation: 500 mg ÷ 330 mg/mL = 1.515 mL → round to 1.5 mL.
QUESTION 8
A patient is prescribed heparin 5,000 units subcutaneously every 12 hours. The vial reads 10,000
units/mL. How many mL will the nurse administer?
Assessment 3.2 | 200 Practice Questions & Detailed Answers |
NGNReady Q&A | A+ Graded
QUESTION 1
A nurse is preparing to administer phenobarbital 5 mg/kg/day PO divided in equal doses every 12 hours
to a client who weighs 44 lb. Available is phenobarbital elixir 20 mg/5 mL. How many mL should the
nurse administer per dose? (Round to the nearest whole number.)
A) 10 mL
B) 13 mL
C) 15 mL
D) 18 mL
Answer: B
Explanation: Convert weight: 44 lb ÷ 2.2 = 20 kg. Daily dose: 5 mg/kg × 20 kg = 100 mg/day. Divided
q12h: 100 mg ÷ 2 = 50 mg/dose. Using the available concentration: (20 mg/5 mL) = (50 mg/X mL) → X =
(50 × 5) ÷ 20 = 12.5 mL → round to 13 mL.
QUESTION 2
A nurse is preparing to administer gentamicin 2 mg/kg IV every 8 hours to a client weighing 132 lb.
Available is gentamicin 40 mg/mL. How many mL should the nurse administer per dose?
A) 1 mL
B) 2 mL
C) 3 mL
D) 4 mL
,Answer: C
Explanation: Convert weight: 132 lb ÷ 2.2 = 60 kg. Dose: 2 mg/kg × 60 kg = 120 mg. Volume: 120 mg ÷ 40
mg/mL = 3 mL.
QUESTION 3
A nurse is preparing to administer heparin 12,000 units subcutaneously every 12 hours. Available is
heparin 20,000 units/mL. How many mL should the nurse administer?
A) 0.3 mL
B) 0.6 mL
C) 1.2 mL
D) 2.0 mL
Answer: B
Explanation: Volume = 12,000 units ÷ 20,000 units/mL = 0.6 mL.
QUESTION 4
A nurse is preparing to administer amoxicillin 30 mg/kg/day PO divided in equal doses every 12 hours to
a client weighing 55 lb. Available is amoxicillin 400 mg/5 mL. How many mL should the nurse administer
per dose? (Round to the nearest whole number.)
A) 3 mL
B) 4 mL
,C) 5 mL
D) 6 mL
Answer: C
Explanation: Convert weight: 55 lb ÷ 2.2 = 25 kg. Daily dose: 30 mg/kg × 25 kg = 750 mg/day. Divided
q12h: 750 mg ÷ 2 = 375 mg/dose. Volume: (400 mg/5 mL) = (375 mg/X mL) → X = (375 × 5) ÷ 400 =
4.6875 mL → round to 5 mL.
QUESTION 5
A nurse is preparing to administer furosemide 60 mg IV push. Available is furosemide 10 mg/mL. How
many mL should the nurse administer?
A) 4 mL
B) 5 mL
C) 6 mL
D) 8 mL
Answer: C
Explanation: Volume = 60 mg ÷ 10 mg/mL = 6 mL.
QUESTION 6
A nurse is preparing to administer digoxin 0.25 mg PO daily. Available is digoxin elixir 0.05 mg/mL. How
many mL should the nurse administer?
, A) 2 mL
B) 3 mL
C) 4 mL
D) 5 mL
Answer: D
Explanation: Volume = 0.25 mg ÷ 0.05 mg/mL = 5 mL.
QUESTION 7
A provider orders cefazolin 500 mg IV every 8 hours. The pharmacy sends a vial labeled 1 g powder. The
reconstitution instructions state: "Add 2.5 mL sterile water to yield 330 mg/mL." How many mL should
the nurse administer? (Round to the nearest tenth.)
A) 1.0 mL
B) 1.5 mL
C) 2.0 mL
D) 2.5 mL
Answer: B
Explanation: 500 mg ÷ 330 mg/mL = 1.515 mL → round to 1.5 mL.
QUESTION 8
A patient is prescribed heparin 5,000 units subcutaneously every 12 hours. The vial reads 10,000
units/mL. How many mL will the nurse administer?
