PTCB Sterile Compounding & Pharmacy Calculations 3

Question 1

What is the formula for calculating a percentage concentration (w/v)?

Accepted Answer

(Weight of solute in grams ÷ volume of solution in mL) × 100

Answer

(Volume of solute ÷ volume of solution) × 100

Answer

(Moles of solute ÷ liters of solution) × 100

Answer

(Weight of solute ÷ weight of solvent) × 100

Question 2

An order requires 250 mg of a drug from a stock solution of 50 mg/5 mL. How many mL are needed?

Accepted Answer

25 mL

Answer

5 mL

Answer

10 mL

Answer

50 mL

Question 3

Which of the following is an isotonic IV solution?

Accepted Answer

0.9% NaCl (normal saline)

Answer

D5W (5% dextrose in water)

Answer

0.45% NaCl (half-normal saline)

Answer

3% NaCl (hypertonic saline)

Question 4

When using dimensional analysis to convert 2.5 kg to grams, the answer is:

Accepted Answer

2500 g

Answer

25 g

Answer

250 g

Answer

25,000 g

Question 5

What does the term 'aseptic technique' refer to in sterile compounding?

Accepted Answer

Procedures that prevent contamination of sterile preparations with microorganisms

Answer

Using only sterile equipment for non-sterile preparations

Answer

Cleaning the pharmacy counter before compounding

Answer

Autoclaving all compounding supplies

Question 6

A pediatric patient weighing 20 kg needs amoxicillin 25 mg/kg/day in two divided doses. What is the per-dose amount?

Accepted Answer

250 mg

Answer

125 mg

Answer

500 mg

Answer

1000 mg