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ATI Dosage Calculation (2)

RN - Nursing Exam(s) 25 Questions ✓ Free Access

Dosage Calculation

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Q1: A nurse is preparing to administer antibiotic X over 20 min. Available is antibiotic X in 50 mL of 0.9% sodium chloride (NSS). The drop factor of the manual IV tubing is 20 gtt/ml. The nurse should set the manual IV infusion to deliver how many gtt I min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

A. 50
Correct Answer: 50
Rationale:
Use the formula: Flow rate = Volume (mL) × Drop factor (gtt/mL) / Time (min) =50×20/20 = 50 gtt/min

Q2: A nurse is preparing to administer 0.45% sodium chloride (NaC1) 1000 mL IV to infuse over 8 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero)

Answer Choices:

A. 125
Correct Answer: 125
Rationale:
1000 mL/8 hr​ = 125 mL/hr

Q3:  A nurse is preparing to administer morphine sulfate 2 mg IV bolus. Available is morphine sulfate 10 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies.Do not use trailing zero.)

Answer Choices:

A. 0.2
Correct Answer: 0.2
Rationale:
2 mg/10 mg/mL=0.2 mL

Q4: A nurse is preparing to administer digoxin 8 mcg/kg/day PO to divide equally every 12 hr for a preschooler who weighs 33 lb. Available is digoxin elixir 0.05 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do use a trailing zero.)

Answer Choices:

A. 1.2
Correct Answer: 1.2
Rationale:
Convert lb to kg: 33 ÷ 2.2 = 15 kg Daily dose: 15 × 8 = 120 mcg Divide for q12h: 120 ÷ 2 = 60 mcg per dose Convert mcg to mg: 60 mcg = 0.06 mg

Q5: A nurse is preparing to infuse a 250-mL unit of packed RBCs over 2 hr. The drop factor of the manual IV tubing is 15 gtts/mL. The nurse should adjust the flow rate to deliver howmany drops per minute? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

A. 31
Correct Answer: 31
Rationale:
250 × 15/ 120 = 31.25 ≈ 31 gtt/min

Access All 25 Questions with Full Explanations

Exam Details
Total Questions: 25 practice questions
Category: RN - Nursing Exam(s)
Subcategory: ATI Exams
Domain: ATI DOSAGE CALCULATION
Last Updated: Nov 29, 2025
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