A patient is experiencing pain, so the physician orders codeine ½ grain every 4 hours. How many milligrams of codeine would the nurse administer?
A) 15 mg
B) 30 mg
C) 60 mg
D) 120 mg
B
Feedback:
The simplest way to convert measurements from one system to another is to set up a ratio and proportion equation. The ratio containing two known equivalent amounts is placed on one side of an equation, and the ratio containing the amount you wish to convert and its unknown equivalent is placed on the other side.
60 mg/1 grain = flexion range of motion. Cross-multiplying yields 30 mg.
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