Module 4 ch 4

Question 1

Converting units

Answer 1

when converting from one unit to another the simplified method of cross multiplication can usually be used

Question 2

Converting within the metric system

Answer 2

When converting within the metric system you can set up a proportion to cross multiply
A similar approach to move the decimal point based on the value of the prefix
Ex: Move 3 spaces to the left when converting from mg to g

Question 3

milliequivalent

Answer 3

A way to measure electrolytes

Question 4

Drug concentration as a percentage

Answer 4

If its w/w write it as grams out of a hundred grams
if it v/v write it as milliliters out of a hundred milliliters

Question 5

Drug concentration as a ratio

Answer 5

1:1000 solution is needed for 20 mg of epinephrine.
1000 ml/1000 mg= x/20 mg

Question 6

Express the 1:1000 epinephrine solution as a percentage concentration of epinephrine

Answer 6

1 g/ 1000 ml= x/ 100 ml

Question 7

U-100

Answer 7

100 units per ml

Question 8

U-500

Answer 8

500 units per ml

Question 9

Weight based doses

Answer 9

Dosing is often expressed as a dose per weight. Kg is the weight unit of measure generally used, so make sure you convert from lbs first.
1 kg/2.2 lbs= x Kg/44 lbs

Question 10

Calculating Med Quantity

Answer 10

Must be able to calculate the quantity of medication needed to fulfill a prescription or medication
Be careful to ensure the correct units for each calculation step
40 mg for 3 days= 40 mg/ 10 mg= 4 tablets
20 mg for 3 days= 20 mg/10 mg= 2 tablets
10 mg for 3 days= 10 mg/10 mg= 1 tablet

Question 11

Calculating medication quantity with drops

Answer 11

How many days will a 7.5 mL bottle of cirpodex suspension last for a prescription to give 4 drops in each ear twice daily.
20 drps/1 ml= x drops/7.5 ml= 150 drops
4 drops x 2 x 2= 16
150 drops/ 16= 9.375 or 9 days

Question 12

Infusion rates

Answer 12

An order reads to give 100 ml of 5% dextrose over 10 minutes. How many mL/ min should the infusion pump be set to?
100 ml/ 10 min= x ml/ 1 min
10 ml

Question 13

Alligation

Answer 13

On occasion you may need to make solution with a concentration percentage in between the available concentrations in stock

Question 14

Alligation ex

Answer 14

Higher conc.I
_____________I

_____________I

Question 15

Alligation ex

Answer 15

Higher conc I I Desired conc- Low C
_____________I____________I__________
I Des Conc I
_____________I____________I__________
Lower Conc I