In mid-January, a 24-year-old man who is brought to the ER b…

In mid-January, a 24-year-old man who is brought to the ER by ambulance after suffering what co-workers described as a seizure like activity. The patient has been working in an enclosed house, using space heaters to keep him warm. He is drowsy on admission without further seizure-like activity. Further questioning of the family reveals no prior history of seizures in the patient and no family history of seizures. Initial evaluation should include all but one. Select the evaluation item not done in the initial workup.