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RN Dosage Calculation~Nursing Care of Children 3.1

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Title : RN Dosage Calculation~Nursing Care of Children 3.1

Type : Nursing

Category : RN Nursing Exam(s)

Subcategory : ATI Exam(s)

Domain : RN ATI Dosage Calculations

Fragment : N/A

Module : RN-NURSING

Exam Status : active

Rating : 95.00%

Attempts Allowed : 100

Exam Year : 2023

Duration : 50 minutes

Total Questions : 10

Passing Score : 100%

Difficulty : Easy

Instructions : Read each question carefully and select the correct answer. Ensure you manage your time effectively to complete all questions within the given timeframe, as answers cannot be changed after submission.

Description : This exam assesses students' proficiency in dosage calculations, including drug conversions, IV flow rates, weight-based dosing, and safe medication administration. The format includes MCQs and calculation-based questions.

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1 : A nurse is preparing to administer diazepam 0.3 mg/kg IV bolus to a toddler who weighs 24 lb. Available is diazepam injection 5 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : Always convert lb to kg before calculating mg/kg doses.

Correct Answers:

0.65

Rationale :

24 lb ÷ 2.2 = 10.9 kg 0.3 mg × 10.9 kg = 3.27 mg 3.27 mg ÷ 5 mg/mL = 0.65 mL

Distractor Analysis :

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2 : A nurse is preparing to administer ketorolac 0.4 mg/kg 1M to an adolescent who weighs 96.8 lb. The amount available is ketorolac 15 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : Round to the nearest tenth unless instructed otherwise.

Correct Answers:

Rationale :

Answer: 1.2 mL Explanation: 96.8 ÷ 2.2 = 44 kg 0.4 mg × 44 = 17.6 mg 17.6 ÷ 15 = 1.17 ≈ 1.2 mL

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3 : A nurse is preparing to administer 7.5 mL of ampicillin 250 mg oral suspension to a toddler who has otitis media. The nurse should recognize that 7.5 mL is equivalent to how many teaspoons? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : 1 tsp = 5 mL; 1 Tbsp = 15 mL

Correct Answers:

Rationale :

1 tsp = 5 mL → 7.5 ÷ 5 = 1.5 teaspoons

Distractor Analysis :

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4 : A nurse is preparing to administer dextrose 5% in 0.9% sodium chloride 125 mL IV to infuse over 15 min. 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.)

Hint : Convert minutes to hours: (volume ÷ time in min) × 60 = mL/hr

Correct Answers:

Rationale :

125 ÷ 15 × 60 = 500 mL/hr

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5 : A nurse is preparing to administer dextrose 5% in water 800 mL IV to infuse over 6 hr to an adolescent client. 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.)

Hint : Round to the nearest whole number.

Correct Answers:

Rationale :

800 ÷ 6 = 133.3 ≈ 133 mL/hr

Distractor Analysis :

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6 : A nurse is preparing to administer morphine 0.1 mg/kg IV bolus every 3 to 4 hr PRN for pain to a school-age child who weighs 51 lb. Available is morphine injection 2 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 a trailing zero.)

Hint : Watch for rounding to the nearest tenth.

Correct Answers:

Rationale :

51 ÷ 2.2 = 23.2 kg 0.1 × 23.2 = 2.32 mg 2.32 ÷ 2 = 1.16 ≈ 1.2 mL

Distractor Analysis :

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7 : A nurse is preparing to administer ephedrine 3 mg/kg/day IV bolus divided in equal doses every 6 hr to a school-age child who weighs 70 lb. Available is ephedrine injection 50 mg/mL. How many mL should the nurse administer per dose?(Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : Divide daily dose by number of doses for scheduled meds.

Correct Answers:

0.48

Rationale :

70 ÷ 2.2 = 31.8 kg 3 mg × 31.8 = 95.4 mg/day 95.4 ÷ 4 doses/day = 23.85 mg/dose 23.85 ÷ 50 = 0.48 mL

Distractor Analysis :

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8 : A nurse is reviewing a new prescription for dexamethasone 0.2 mg/kg/day PO in two divided doses for a child who weighs 66 lb. The amount available is dexamethasone 0.5 mg/5 mL elixir. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : Use ratio/proportion when dealing with elixirs.

Correct Answers:

Rationale :

66 ÷ 2.2 = 30 kg 0.2 × 30 = 6 mg/day 6 ÷ 2 = 3 mg/dose Set up proportion: 0.5 mg : 5 mL = 3 mg : x → (3 × 5) ÷ 0.5 = 30 mL

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9 : A nurse is preparing to administer cephalexin 50 mg/kg/day PO divided in equal doses every 6 hr to a preschooler who weighs 37 lb. Available is cephalexin suspension 250 mg/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)

Hint : Divide total daily dose first, then solve proportion.

Correct Answers:

Rationale :

37 ÷ 2.2 = 16.8 kg 50 × 16.8 = 840 mg/day 840 ÷ 4 = 210 mg/dose Set up proportion: 250 mg : 5 mL = 210 mg : x → (210 × 5) ÷ 250 = 4.2 mL

Distractor Analysis :

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10 : A nurse is preparing to administer acetaminophen 10 mg/kg PO every 4 to 6 hours PRN pain to a toddler who weighs 26.4 lb. Available is acetaminophen liquid 160 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if applicable. Do not use a trailing zero.)

Hint : Reconstituted doses require using the new concentration.

Correct Answers:

Rationale :

60 ÷ 50 = 1.2 mL

Distractor Analysis :

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