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Dosage Calculation Review

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Health care aide

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Health Care Aide

Things to consider when Drug Calculation Problems require Conversions 1. Look at what is available and what you want to give. Ask yourself the question, “Are the drugs in the same units of measure?” 2. If the drugs are not in the same units of measure, convert one. 3. It is best to conv...

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Uploaded on July 26, 2024
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dosage calculation review

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Dosage Calculation Review Study Booklet

Table of Contents
Page Numbers

Conversion Table ………………………………. 2

Conversions Facts………………………………. 3, 4 Conversion

Practice Problems………………… 5

Oral and Parenteral Calculations…………….. 6, 7

Oral and Parenteral practice problems………. 8

Reconstitution of Drug…………………………. 9

Reconstitution practice problems……………… 9

Pediatric drug calculations…………………….. 10

Rounding children dosages and weight……….. 11

Pediatric Practice problems…………………… 12

Intravenous fluid administration……………… 14,15,16,17

Calculating IV infusion Time ………………… 18

Calculating IV Fluid Volume …………………. 19

Practice Problems (IV Time and Volume)…….. 19, 20

Practice IV Problems…………………………… 21, 22 Critical

Care IV Calculations………………….. 23

IV Medication Ordered/min…………………… 24

IV Medication Ordered/Kg/Min………………. 25

Advance Dosages Practice Problems…………. 26, 27

Practice Problems Answers…………………… 28, 29, 30

The Official “Do Not Use List”………………. 31

References……………………………………… 32

1

, Conversion Table to be Memorized
Conversion Table
Metric Volume Weights: Apothecary/

Household to Metric

1 L= 1000 mL 1 gr = 60 mg

15 gr = 1 g

Metric Weight 2.2 lbs = 1 kg

1000 mcg = 1 mg Solutions

1000 mg = 1 g 1 g per 100 mL = 1% solution

1000 g = 1 kg 25 g per 100 mL = 25 % solution

Length 100 g per 100 mL = 100% solution

1 inch = 2.5 centimeters

Liquids

1 mL = 1cc 15 mL = 3 tsp 2 c = 1 pt

1 mL = 15 gtts 15 mL = 1 Tbs 1000 mL = 1 qt

1 mL = 15 minims 30 mL = 1 oz 32 oz = 1 qt

1 mL = 60 microdrops 1 Tbs = 3 tsp 1 L = 1 qt

4 mL = 1 dram 8 dram = 1 oz 1 L = 1000 mL

5 mL = 1 tsp 240 mL = 1 c 4 qt = 1 gal

500 mL = 1 pt

2

, Conversions: Metric, Apothecary, and Household System
Converting from one unit to another using the conversion factor method

• Recall the equivalents

• Multiply or divide
Rule to convert from a larger to a smaller unit measurement, multiply by the
conversion factor.

Think: “Larger is going down to smaller, so you will multiply.”

Larger↓ Smaller→ Multiply (X)

Example: How many cups are in 3 quart? You know that 1 quart =4 cups.
Cups are smaller than quarts. THINK:
LARGER↓SMALLER→MULTIPLY(X)

The conversion Factor is 4 cups /1 quart

Multiply by the conversion factor

Quarts (larger unit) X conversion factor (cups/qt) = cups (smaller unit) 3

qt X 4 cups/qt = 12 cups

Rule to convert from a smaller to a larger unit of measurement, divide by the conversion
factor.

THINK: “Smaller is going to larger, so you will divide.” Smaller ↑ Larger → Divide (

) Example: How many quarts are in 8 cups?

You know that 1 qt= 4 cups. The conversion factor is 4 cups/1 quart. Quarts are larger
than cups. Divide by the conversion factor because it takes fewer of the quart unit to equal
the same amount of the cup unit. THINK: SMALLER ↑LARGER → Divide 8 cups
4 cups/qt = 2 qt

3

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