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Practice Question

A nurse is preparing to administer acetaminophen 10 mg/kg PO every 6 hr to a toddler who weighs 26.4 lb. Available is acetaminophen 80 mg/0.8 mL liquid. How many mL should the nurse administer with each dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

Correct Answer:

1.2

Rationale:

Step 1: Convert pounds (lb) to kilograms (kg)

Formula:

kg = lb ÷ 2.2

Substitution:

kg = 26.4 ÷ 2.2 = 12 kg

Step 2: Calculate the prescribed dose in mg

Formula:

Dose (mg) = 10 mg × kg

Substitution:

Dose = 10 × 12 = 120 mg

Step 3: Set up a proportion to find the volume (mL)

Formula:

Volume (mL) = (Prescribed dose ÷ Available concentration) × Available volume

Available concentration = 80 mg per 0.8 mL

Substitution:

Volume = (120 ÷ 80) × 0.8

Volume = 1.5 × 0.8

Volume = 1.2 mL

✅ Summary Formulas:

kg = lb ÷ 2.2

Dose (mg) = 10 mg × kg

Volume (mL) = (Prescribed dose ÷ Available concentration) × Available volume

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This question is from ATI LPN Pharmacology 2023 (I) which contains 59 questions.

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From Exam
ATI LPN Pharmacology 2023 (I)

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Question Details
  • Category: LPN - Nursing Exam(s)
  • Subcategory: ATI Exams
  • Domain: PHARMACOLOGY PN
  • Answer Choices: 1
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