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The nurse in the respiratory care unit completes a lung assessment and reviews the laboratory results of a serum medication level assay for a client receiving theophylline. The nurse determines that a therapeutic medication level has been achieved by indication of which value? 1.8 mcg/mL (44 mcmol/L) 2.9 mcg/mL (50 mcmol/L) 3.18 mcg/mL (100 mcmol/L) 4.26 mcg/mL (144 mcmol/L)
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