LC is а 33-yeаr-оld wоmаn whо underwent an emergency cesarean delivery after a prolonged labor, during which she exhibited a sudden change in neurologic functioning and started seizing. Since that time she has experienced three tonic-clonic (grand mal) seizures. She was diagnosed with a basal ganglion hematoma with infarct and was started on phenytoin (Dilantin). You check the chart and note that LC's last Dilantin level was 16 mcg/mL. What action do you expect based on this level?