FCEM2-0582

A 75-year-old gentleman is brought in by ambulance from his assisted living facility with a decreased level of consciousness. He has a history of type II diabetes mellitus, which is managed with glibenclamide and metformin. He is unconscious but breathing on his own and has a strong pulse. You order a blood glucose test, and his result is 1.0 mmol/l. Intravenous access has been established.
What is the MOST appropriate initial step in managing this patient?