CPTP 3.18 Drug Calculations

Question 1

What are the prescribing conventions?

Answer 1

• Write out micrograms, nanograms and “units” (for diabetes treatment) in full
  
  • No naked decimals (e.g. “.5”)
  • Avoid ‘hanging’ zeros (e.g. “5.0”)

Question 2

How are percentage concentrations expressed?

Answer 2

• % w/v = grams per 100ml

* % v/v = ml per 100ml

Question 3

How are ratio concentrations expressed?

Answer 3

mass (g):volume (ml)
• E.g. 1:10 means 1g in 10ml
• 1 in 5 means 1g in 5ml