Practice Question
A nurse is preparing to administer oxacillin 100 mg/kg/day IM divided in equal doses every 4 hr to a preschooler who weighs 40 lb. Available is oxacillin injection 250 mg/1.5 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 a trailing zero.)
Answer Choices:
Correct Answer:
1.8
Rationale:
✍️ Formula:
➡️ kg = lb ÷ 2.2
➡️Daily dose (mg) = mg/kg/day × kg
➡️Dose per dose (mg) = daily dose ÷ number of doses per day
➡️ Volume (mL) = (dose per dose ÷ stock mg) × stock mL
✍️ Given:
➡️ Weight = 40 lb
➡️Ordered dose = 100 mg/kg/day IM
➡️ Frequency = q4 hr → 6 doses/day
➡️ Stock = 250 mg/1.5 mL
✍️ Calculation:
➡️ kg = 40 ÷ 2.2 ≈ 18.2 kg
➡️ Daily dose = 100 × 18.2 ≈ 1,820 mg/day
➡️ Dose per dose = 1,820 ÷ 6 ≈ 303.3 mg
➡️ Volume = (303.3 ÷ 250) × 1.5
↦ 1.8 mL per dose
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This question is from Dosage Calculation PN Pediatric Nursing Proctored Assessment 3.2 which contains 32 questions.
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Dosage Calculation PN Pediatric Nursing Proctored Assessment 3.2
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- Category: RN Nursing Exam(s)
- Subcategory: ATI Exam(s)
- Domain: RN ATI Pediatrics
- Answer Choices: 1