Pharmaceutical Measurements and Calculations
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Pharmaceutical Measurements and Calculations

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. 2. Presentation Topics. Systems of Pharmaceutical MeasurementBasic Calculations Used in Pharmacy PracticeAdvanced Calculations Used in Pharmacy Practice. . 3. Learning Objectives. Describe four systems of measurement commonly used in pharmacy and convert units from one system to another. Explai
Pharmaceutical Measurements and Calculations

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1. Pharmaceutical Measurements and Calculations

2. Presentation Topics Systems of Pharmaceutical Measurement Basic Calculations Used in Pharmacy Practice Advanced Calculations Used in Pharmacy Practice

3. Learning Objectives Describe four systems of measurement commonly used in pharmacy and convert units from one system to another. Explain the meanings of the prefixes most commonly used in metric measurement.

4. Learning Objectives Convert from one metric unit to another (e.g., grams to milligrams). Convert Roman numerals to Arabic numerals. Convert time to 24 hour military time.

5. Learning Objectives Convert temperatures to and from the Fahrenheit and Celsius scales. Round decimals up and down.

6. Learning Objectives Perform basic operations with proportions, including identifying equivalent ratios and finding an unknown quantity in a proportion. Convert percentages to and from fractions, ratios, and decimals.

7. Learning Objectives Perform fundamental dosage calculations and conversions. Solve problems involving powder solutions and dilutions.

8. Learning Objectives Use the alligation method to prepare solutions. Calculate the specific gravity of a liquid.

9. Systems of Pharmaceutical Measurement The metric system Common measures Numeric systems Time Temperature

10. The Metric System Pharmacists and pharmacy techs must make precise measurements daily Most important measurements are Temperature Distance Volume Weight

11. Terms to Remember metric system a measurement system based on subdivisions and multiples of 10; made up of three basic units: meter, gram, and liter

12. Terms to Remember meter the metric system?s base unit for measuring length gram the metric system?s base unit for measuring weight liter the metric system?s base unit for measuring volume

13. The Metric System Legal standard of measure for pharmaceutical measurements Developed in France in the 1700s Has several advantages Based on decimal notation Clear correlations among units of measurement Used worldwide

14. The Metric System Uses standardized units of Systeme International (SI) Three basic units Meter (distance, little use in pharmacy) Gram (weight, used for solid form meds) Liter (volume, used for liquid meds) Numbers expressed as decimals rather than fractions

15. The Metric System An error of a single decimal place is an error of a factor of 10.

16. The Metric System

17. The Metric System

18. Common Measures Common measures are approximate. Three types of common measures are used in the pharmacy: Apothecary Avoirdupois Household Common measures are often converted to metric equivalents.

19. Common Measures

20. Common Measures For safety reasons, the use of the apothecary system is discouraged. Use the metric system.

21. Common Measures

22. Common Measures

23. Common Measures Always carefully check and double-check all calculations.


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