Chapter 45: Pharmacology Math
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14 Terms
What is the basic dosage formula?
Desired dose / dose on hand x quantity = amount to administer.
How many milliliters are in 1 liter?
1000 mL.
How many milligrams are in 1 gram?
1000 mg.
How many micrograms are in 1 milligram?
1000 mcg.
How many kilograms is 1 pound approximately?
1 lb = 0.454 kg; 1 kg = 2.2 lb.
How do you convert pounds to kilograms?
Divide pounds by 2.2.
How do you convert kilograms to pounds?
Multiply kilograms by 2.2.
What should the MA do with an unusually large or small calculated dose?
Stop and verify the order/calculation with provider or supervisor.
What is the rule for leading zeros?
Use leading zero before decimals less than 1 (0.5 mg).
What is the rule for trailing zeros?
Do not use trailing zeros (write 5 mg, not 5.0 mg).
How do you convert 0.5 g to mg?
0.5 g x 1000 = 500 mg.
How do you convert 250 mcg to mg?
250 mcg / 1000 = 0.25 mg.
What is ratio/proportion used for?
Solving medication dose conversions and amounts.
What is the first step in any dosage calculation?
Make units match the ordered dose and medication label.