The client is taking phenytoin for seizure control, and a blood sample for a serum drug level is drawn. Which laboratory finding indicates a therapeutic serum drug result? 1. 5 mcg/mL...

The client is taking phenytoin for seizure control, and a blood sample for a serum drug level is drawn. Which laboratory finding indicates a therapeutic serum drug result?

1. 5 mcg/mL (19.84 mcmol/L) 2. 15 mcg/mL (59.52 mcmol/L) 3. 25 mcg/mL (99.2 mcmol/L) 4. 30 mcg/mL (119.0 mcmol/L