Sterile Compounding & Pharmacy Calculations Flashcards
6 cards from real PTCB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Sterile Compounding & Pharmacy Calculations flashcards as text
What is the formula for calculating a percentage concentration (w/v)?
Answer: (Weight of solute in grams ÷ volume of solution in mL) × 100
A w/v percentage = (grams of solute ÷ mL of solution) × 100; e.g., 5 g in 100 mL = 5% w/v.
An order requires 250 mg of a drug from a stock solution of 50 mg/5 mL. How many mL are needed?
Answer: 25 mL
50 mg/5 mL = 10 mg/mL; 250 mg ÷ 10 mg/mL = 25 mL needed.
Which of the following is an isotonic IV solution?
Answer: 0.9% NaCl (normal saline)
0.9% NaCl (normal saline) is isotonic with a tonicity of approximately 308 mOsm/L, close to plasma osmolarity.
When using dimensional analysis to convert 2.5 kg to grams, the answer is:
Answer: 2500 g
2.5 kg × 1,000 g/kg = 2,500 g.
What does the term 'aseptic technique' refer to in sterile compounding?
Answer: Procedures that prevent contamination of sterile preparations with microorganisms
Aseptic technique encompasses all practices used to prevent microbial contamination during the preparation of sterile products.
A pediatric patient weighing 20 kg needs amoxicillin 25 mg/kg/day in two divided doses. What is the per-dose amount?
Answer: 250 mg
Total daily dose = 25 mg/kg × 20 kg = 500 mg/day; divided into 2 doses = 250 mg per dose.