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The nurse is reviewing the laboratory results of a serum medication level assay for a client seen in the health care clinic who has been taking phenytoin for the control of seizures. The nurse determines that a subtherapeutic level of phenytoin is present and that additional medication is required if which level is found? 1.3 mcg/mL (12 mcmol/L) 2.16 mcg/mL (63 mcmol/L) 3.18 mcg/mL (71 mcmol/L) 4.24 mcg/mL (95 mcmol/L)

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