A 68-year-old woman is admitted to the hospital with chronic obstructive pulmonary disease (COPD). She is started on an aminophylline infusion. Three days later she is breathing easier. A serum theophylline level is drawn. Which of the following values represents a therapeutic level?
A. 14 µ g/mL
B. 25 µ g/mL
C. 4 µ g/mL
D. 30 µ g/mL
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