What is the strongest solution concentration?
1:10
1:25
1:300
1:450
1:10
What is the strongest concentration?
125mg/mL 250mg/mL 600mg/mL 1g/3mL
600mg/mL
Arrange from smallest to largest
2/3
5/8
3/10 5/8
3/10
32/50
22/25
2/3
32/50
22/25
Find Percent of a Quantity
1. Percentage = Percent X Whole amount
2. Change the percent to a decimal
3. Multiply the decimal by the whole quantity
EXAMPLE: Pt drank 25% of his 4 ounce juice, how many ounces did he drink
Change percent to decimal 25% = 0.25
Multiply 0.25 X 4 = 1 ounce
What is 8% of 450?
Converting within the Metric System
PREFIX
KILO-
Weight
kilogram
Hecto-
Deka-
BASE
DECI-
CENTI-
MILLI-
gram
milligram
Volume
liter
Milliliter
Length
meter
Value to 1,000
Base
100
10
1.0
0.1
centimeter
Millimeter
0.01
0.001
Decimilli-
Centimilli-
MICRO
microgram
0.0001
0.00001
0.000001
Approximate Equivalents
Memorize!!
1 g = gr xv (15.432 grains) gr i = 60 mg (sometimes 65 mg)
1t = 5 mL
1 T = 15 mL = fl oz
1 fl oz = 30 mL = 6 t
1 L = 32 fl oz = 4 c
1 c = 250 mL (240) = 8 fl oz
1kg = 2.2 lb
1 in = 2.5 cm
Temperature Conversion
• F to C = Subtract 32 and then divide result by 1.8
C = F-32
1.8
• C to F = Multiply by 1.8 and add 32
F = 1.8 X C + 32
• EXAMPLES:
• 99.4 F = _______C
• 99.4 – 32 = 67.4 / 1.8 = 37.4C
• 39.5 C = _______F
• 39.5 X 1.8 = 71.1 + 32 = 103.1
Read the Label
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1. Identify the brand or trade name then generic name.
2. Identify the dosage strength of the medication
3. Identify the form of the medication.
4. Total amount in the container
5. The medication should be stored below what temperature? Calculate Dosages
The physician orders Synthroid 50 mcg PO every morning. The above is label pulled out of pyxis.
How much will you administer per dose?
½ tablet
Calculate Dosages
The physician orders hydroxyzine hydrochloride
20 mg IM x 1 dose STAT. You pull the above out of pyxis. How many mL will you give?
0.4 mL
