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
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.
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.
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.
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.
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.
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.
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.