Metric Household Measurements BCC Pharmacy Tech Metric Measurements

Metric & Household Measurements BCC Pharmacy Tech

Metric Measurements � Metric system=system of choice for dealing with weights and measures in the calculations of drug dosages � Decimal system � 0. 5 � 0. 75 � 0. 007

� Certain prefixes identify multiples of 10 that are being used. � 4 most common; micro, milli, centi, kilo � Prefixes can be used with any of the base units weight (gram), volume (liter) or length (meter)

� Weight � 1, 000 mcg=1 g � 1, 000 mcg = 1 mg � 1000 mg =1 g � 1000 g = 1 kg � Volume � 1000 m. L = 1 L � 1 cc = 1 m. L � Length � 1 m = 1, 000 mm or 100 cm � 1 cm = 10 mm or 0. 01 m � 1 mm = 0. 1 cm or 0. 001 m

Example � 300 mg equals how many grams? 100 mg: 1 g: : _____ mg: _____ g 1000 mg: 1 g : : 300 mg: __x__ g

More Practice � 2. 5 L equals how many milliliters? � 180 mcg equals how many grams? � 15 mm equals how many centimeters?

Household Measurements � Household measures are not accurate enough for the nurse to use in the calculation of drug dosages in the hospital. � Metric equivalents are used. � I & O or intake and output

Metric Household Equivalents � Metric � 5 Measure = Household Measure m. L = 1 tsp � 15 m. L = 1 Tbsp � 30 m. L = 1 oz � 240 m. L = 1 standard measuring cup � 1 kg or 1000 g = 2. 2 lb � 2. 5 cm = 1 in � 1 foot = 12 inches

Example � 1 ½ cups equals how many milliliters? � 1 cup : 240 m. L : : _____ cups : _____m. L � 1 cup : 240 m. L : : 1 ½ cups : __x__ m. L

More Practice � 35 kg equals how many pounds? � 18 inches equals how many centimeters?

To do � Memorize the tables of metric and household measurements. � Study material on forming proportions for the calculations problems relating to these measurements. � Complete the worksheet � Check your answers � Evaluate your learning