| | |
SITE SEARCH
Learning Resource Centre
 
»Book a Tutor
»Become a Tutor
»Math Learning Centre
»Learning Strategies
»Learning Circles, Review Sessions & Open Tutoring9
»Tutoring Guidelines
»Practice and Review
Pathology Reviews
Pathology Worksheets/Quizzes
Anatomy Worksheets
»English Language Help
»Contact the Learning Centre
»eCentennial
»myCentennial
Font Size
Smaller
Restore Larger

Nursing Math Review

Conversions Review

Measurement Systems:

There are three measurement systems used in the calculation of drug dosages: Metric, Apothecary, and Household systems.

Abbreviations

 

Metric

mcg - microgram

mg - milligram

gm - gram

kg - kilogram

ml - milliliter

cc - cubic centimeter

 

Apothecary 

gr - grain (for weight)

lb - pounds (for weight)

m - minim (for volume)

oz - ounce (for volume)

 

Household

tsp - teaspoon

T or Tbs - tablespoon

c - cup

pt - pint

qt - quart

To avoid fractions, apothecary and household measures can be converted to the metric system.

 

Important Conversions:

Metric to Metric:

1 kg = 1000 gm

1 gm = 1000 mg

1 mg = 1000 mcg

1 L = 1000 ml = 1000 cc

1 ml = 1000 mcl

1 ml = 1 cc

 

Household to Household:

1 Tbs = 3 tsp

1 oz = 2 Tbs

 

Between Systems:

gr 1 = 60 mg

gr 5 = 300 mg

gr 15 = 1000 mg = 1 g

gr 1/150 = 0.4 mg

1 oz = 30 ml

1 dr = 4 ml

1 Tbs = 15 ml

1 tsp =  5 ml

1 min = 15 ml

1 min = 0.06 ml = 1 drop

Basic Formula, flow rates, and infusion time Review

Basic Formula

Desired Dose  x   VolumeDose on Hand   = VolumeDesired Dose     

Dose on Hand   

or

D  x S = A

H

Flow Rates (gtt/min)

Flow Rate    =    Total Volume (mL) x Set Calibration (gtt/mL)

                                              Time (min)

Flow Rate = mL/hr ¸ Division Factor

Division Factor = 60 ¸ calibration

Infusion Time

Infusion Time  =  Total Volume to be Infused

                             mL/hr being infused

Infusion Time = Total Volume to Infuse  ÷       gtt / min        x  60 mi

                                                               Set calibration

 

book a tutor