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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.

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  1. A compounded IV bag contains 3 g of vancomycin in 300 mL NS. What is the concentration in mg/mL?

    Answer: 10 mg/mL

    3 g = 3000 mg; 3000 mg ÷ 300 mL = 10 mg/mL.

  2. A prescription requires 120 mL of a solution containing 15 mg/mL of drug X. How many grams of drug X are needed?

    Answer: 1.8 g

    120 mL × 15 mg/mL = 1800 mg = 1.8 g.

  3. An insulin drip is running at 8 mL/hr. The bag contains 100 units in 100 mL NS. How many units per hour is the patient receiving?

    Answer: 8 units/hr

    Concentration = 100 units/100 mL = 1 unit/mL; 8 mL/hr × 1 unit/mL = 8 units/hr.

  4. You need to prepare 200 mL of a 10% solution using pure drug powder. How much powder (in grams) is required?

    Answer: 20 g

    10% w/v = 10 g/100 mL; for 200 mL: 10 × 2 = 20 g.

  5. A patient weighs 154 lbs. A drug is dosed at 2 mg/kg. What is the total dose in mg?

    Answer: 140 mg

    154 lbs ÷ 2.2 = 70 kg; 70 kg × 2 mg/kg = 140 mg.

  6. A 1 L bag of D10W provides how many kilocalories from dextrose?

    Answer: 340 kcal

    D10W = 10 g dextrose/100 mL = 100 g/L; dextrose provides 3.4 kcal/g; 100 g × 3.4 = 340 kcal.

  7. A USP compounding record requires documenting beyond-use dates. A high-risk CSP stored at 2-8°C has a maximum BUD of:

    Answer: 3 days

    USP (2023) assigns a maximum 3-day BUD for Category 2 (formerly high-risk) CSPs stored at controlled cold temperature.

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