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Dosage Calculations Flashcards

7 cards from real PTCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. An IV is infusing at 50 mL/hr using a 15 gtt/mL drip set. What is the drop rate in gtt/min?

    Answer: 12.5 gtt/min

    50 mL/hr × 15 gtt/mL ÷ 60 min/hr = 12.5 gtt/min.

  2. A topical cream is prescribed as 'apply TID to affected area, 30g tube.' At an estimated 1g per application, how many days will the tube last?

    Answer: 10 days

    TID = 3 times daily; 30g ÷ 3g/day = 10 days.

  3. Convert 0.125 mg to micrograms (mcg).

    Answer: 125 mcg

    1 mg = 1,000 mcg; 0.125 × 1,000 = 125 mcg.

  4. A patient needs a 2% lidocaine solution. How many mg of lidocaine are in 10 mL?

    Answer: 200 mg

    2% = 2 g/100 mL = 20 mg/mL; 20 mg/mL × 10 mL = 200 mg.

  5. A physician orders phenobarbital 3 mg/kg for a child weighing 44 lbs. Tablets are 15 mg. How many tablets are needed?

    Answer: 6 tablets

    44 ÷ 2.2 = 20 kg; 20 × 3 mg = 60 mg; 60 ÷ 15 mg/tab = 4 tablets.

  6. A 500 mL bag with 20 mEq KCl must infuse in 4 hours. What is the infusion rate?

    Answer: 125 mL/hr

    500 mL ÷ 4 hr = 125 mL/hr.

  7. A prescription calls for ibuprofen suspension 100 mg/5 mL; dose is 10 mg/kg for a 22 kg child. How many mL per dose?

    Answer: 11 mL

    22 kg × 10 mg/kg = 220 mg; 220 ÷ (100/5) = 220 ÷ 20 = 11 mL.