1,000,000 microliters (not common in practice)0.1 L100 mL0.001 L1 mLIt’s your turn to practice applying equivalents. Interpret the following examples:1.1000 mg = _____ g2.1 tsp = _____mL3.15 mL = _____ tbsp4.1 oz = _____ mL 2
5. 65 mg = gr _____ 6. 1 kg = _____ lb 7. 480ml = _____ pt Part 1I – Calculations The time has come to learn how to use what you have learned to calculate doses. We will start with types of formulas and then move onto applications. Ratio and Proportion A ratio is an expression of a relationship between two measurements. A ratio can be expressed as a fraction or decimal. Example: 1:3 can be expressed as 1 3 ∨ 1 ÷ 3 = 0.75 It’s your turn to practice expressing ratios as a fraction: 8. 2:3 = _____ 9. 5:7 = _____ It’s your turn to practice expressing ratios as a decimal: 10. 5:10 = _____ 11. 1:5 = _____ A proportion is used to determine if two ratios are equivalent. Example: 1 2 = 6 12 or 1:2 = 6:12 To check a proportion, just calculate for each side of the equal sign. Watch Solving a Proportion (0:56 min): - matic.com/watch/cqjnFtOHin It’s your turn to practice checking proportions: 12. 8:10 = 2:4 Is it equal? _____ 13. 5:6 :: 1:3 Is it equal? _____ 3
You can also use proportions to solve for an unknown value. Watch Solving for an Unknown Proportion (1:23 min): - matic.com/watch/cqjnqnOHQS It’s your turn to practice solving for an unknown: 14. 3:10 = 10:x x = _____ 15. 5:6 = x:30 x = _____ Fractions A method for solving more complicated problems (multiple steps). The benefit to this method is to keep track of your units. Example: 0.65 g = gr 10 Formula Based Practice Formula based calculations use a formula to calculate for a specific outcome. Dosing formula DO DH xQ Example 1: A physician orders 500mg of cephalexin by mouth STAT. Your office has 250mg capsules onhand. How many capsules would you give your patient? 4 What does it mean? DO = Dose ordered DH = Dose on hand Q or V = Quantity of dose on hand
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- Winter '17
- D. Nolder