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Sterile Compounding Calculations Flashcards

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

Read the first 7 Sterile Compounding Calculations flashcards as text

  1. A TPN order requires 500 mEq of sodium chloride. How many mL of 23.4% NaCl (4 mEq/mL) are needed?

    Answer: 125 mL

    500 mEq ÷ 4 mEq/mL = 125 mL.

  2. An IV solution contains 1 g of drug in 250 mL. What is the concentration in mg/mL?

    Answer: 4 mg/mL

    1 g = 1000 mg; 1000 mg ÷ 250 mL = 4 mg/mL.

  3. A pediatric patient weighs 22 lbs. A drug is dosed at 10 mg/kg/day. What is the daily dose?

    Answer: 100 mg

    22 lbs ÷ 2.2 = 10 kg; 10 kg × 10 mg/kg = 100 mg/day.

  4. You need to prepare 200 mL of a 0.5% solution from a 2% stock solution. How many mL of stock do you need?

    Answer: 50 mL

    C1V1 = C2V2 → 2% × V1 = 0.5% × 200 mL → V1 = 50 mL.

  5. A continuous infusion is ordered at 15 mL/hr. How many hours will a 250 mL bag last?

    Answer: 16.7 hours

    250 mL ÷ 15 mL/hr ≈ 16.7 hours.

  6. A drug has an osmolarity of 1500 mOsm/L. If diluted to 500 mL with D5W, what is the approximate osmolarity?

    Answer: 750 mOsm/L

    1500 mOsm/L × 1 L ÷ 2 (500 mL dilution) → 750 mOsm/L approximate midpoint.

  7. How many milliequivalents of potassium are in 20 mL of potassium chloride 10% (MW KCl = 74.5 g/mol)?

    Answer: 26.8 mEq

    20 mL × 0.10 g/mL = 2 g; 2000 mg ÷ 74.5 mg/mEq = 26.8 mEq.

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