The Complete ATI Dosage Calculation
Proctored Exam Mastery Guide:
Practice Questions with Step-by-Step
Rationales
SECTION 1: BASIC DOSAGE CALCULATION (Questions 1–20)
Question 1
A health care provider orders 250 mg of an antibiotic suspension.
The label reads "500 mg/5 mL." How many mL should the nurse
administer?
A) 1.5 mL
B) 2 mL
C) 2.5 mL
D) 5 mL
Answer: C) 2.5 mL
Rationale: Use the formula: (Desired ÷ Available) × Quantity =
(250 mg ÷ 500 mg) × 5 mL = 0.5 × 5 = 2.5 mL.
,Question 2
The provider orders ascorbic acid 1 g daily by mouth. The
medication comes in 250 mg tablets. How many tablets will the
nurse give?
A) 2 tablets
B) 3 tablets
C) 4 tablets
D) 5 tablets
Answer: C) 4 tablets
Rationale: Convert 1 g to mg: 1 g = 1000 mg. Then (1000 mg ÷
250 mg) = 4 tablets.
Question 3
A provider orders amoxicillin 250 mg by mouth twice daily. The
label reads "Amoxicillin 125 mg/5 mL." How many mL will the
nurse administer per dose?
A) 5 mL
B) 7.5 mL
C) 10 mL
D) 12.5 mL
Answer: C) 10 mL
Rationale: (250 mg ÷ 125 mg) × 5 mL = 2 × 5 = 10 mL.
,Question 4
A nurse is to administer 175 mg of a medication IM. The vial
concentration is 100 mg/mL. What volume should the nurse
administer?
A) 1.5 mL
B) 1.7 mL
C) 1.75 mL
D) 2 mL
Answer: B) 1.7 mL
Rationale: 175 mg ÷ 100 mg/mL = 1.75 mL (rounded to nearest
tenth = 1.7 mL).
Question 5
The nurse is preparing to administer 80 mg of Solu-Medrol IV. The
vial contains 120 mg per 2 mL. How many mL should the nurse
draw up?
A) 1 mL
B) 1.3 mL
C) 1.5 mL
D) 2 mL
Answer: B) 1.3 mL
Rationale: (80 mg ÷ 120 mg) × 2 mL = 0.667 × 2 = 1.33
mL (rounded to nearest tenth = 1.3 mL).
, Question 6
The provider prescribes ascorbic acid 0.5 g daily. The label reads
ascorbic acid 250 mg tablets. How many tablets should the nurse
administer?
A) 1 tablet
B) 2 tablets
C) 3 tablets
D) 4 tablets
Answer: B) 2 tablets
Rationale: Convert 0.5 g to mg: 0.5 g = 500 mg. Then 500 mg ÷
250 mg = 2 tablets.
Question 7
A client is to receive 0.5 mg of digoxin. Available are 250 mcg
tablets. How many tablets should the nurse administer?
A) 1 tablet
B) 1.5 tablets
C) 2 tablets
D) 2.5 tablets
Answer: C) 2 tablets
Rationale: Convert 0.5 mg to mcg: 0.5 mg = 500 mcg. Then 500
mcg ÷ 250 mcg = 2 tablets.
Proctored Exam Mastery Guide:
Practice Questions with Step-by-Step
Rationales
SECTION 1: BASIC DOSAGE CALCULATION (Questions 1–20)
Question 1
A health care provider orders 250 mg of an antibiotic suspension.
The label reads "500 mg/5 mL." How many mL should the nurse
administer?
A) 1.5 mL
B) 2 mL
C) 2.5 mL
D) 5 mL
Answer: C) 2.5 mL
Rationale: Use the formula: (Desired ÷ Available) × Quantity =
(250 mg ÷ 500 mg) × 5 mL = 0.5 × 5 = 2.5 mL.
,Question 2
The provider orders ascorbic acid 1 g daily by mouth. The
medication comes in 250 mg tablets. How many tablets will the
nurse give?
A) 2 tablets
B) 3 tablets
C) 4 tablets
D) 5 tablets
Answer: C) 4 tablets
Rationale: Convert 1 g to mg: 1 g = 1000 mg. Then (1000 mg ÷
250 mg) = 4 tablets.
Question 3
A provider orders amoxicillin 250 mg by mouth twice daily. The
label reads "Amoxicillin 125 mg/5 mL." How many mL will the
nurse administer per dose?
A) 5 mL
B) 7.5 mL
C) 10 mL
D) 12.5 mL
Answer: C) 10 mL
Rationale: (250 mg ÷ 125 mg) × 5 mL = 2 × 5 = 10 mL.
,Question 4
A nurse is to administer 175 mg of a medication IM. The vial
concentration is 100 mg/mL. What volume should the nurse
administer?
A) 1.5 mL
B) 1.7 mL
C) 1.75 mL
D) 2 mL
Answer: B) 1.7 mL
Rationale: 175 mg ÷ 100 mg/mL = 1.75 mL (rounded to nearest
tenth = 1.7 mL).
Question 5
The nurse is preparing to administer 80 mg of Solu-Medrol IV. The
vial contains 120 mg per 2 mL. How many mL should the nurse
draw up?
A) 1 mL
B) 1.3 mL
C) 1.5 mL
D) 2 mL
Answer: B) 1.3 mL
Rationale: (80 mg ÷ 120 mg) × 2 mL = 0.667 × 2 = 1.33
mL (rounded to nearest tenth = 1.3 mL).
, Question 6
The provider prescribes ascorbic acid 0.5 g daily. The label reads
ascorbic acid 250 mg tablets. How many tablets should the nurse
administer?
A) 1 tablet
B) 2 tablets
C) 3 tablets
D) 4 tablets
Answer: B) 2 tablets
Rationale: Convert 0.5 g to mg: 0.5 g = 500 mg. Then 500 mg ÷
250 mg = 2 tablets.
Question 7
A client is to receive 0.5 mg of digoxin. Available are 250 mcg
tablets. How many tablets should the nurse administer?
A) 1 tablet
B) 1.5 tablets
C) 2 tablets
D) 2.5 tablets
Answer: C) 2 tablets
Rationale: Convert 0.5 mg to mcg: 0.5 mg = 500 mcg. Then 500
mcg ÷ 250 mcg = 2 tablets.
