A family brings their teenage daughter to the ED for evaluat…

A family brings their teenage daughter to the ED for evaluation due to concerns of possible meningitis. The girl complains of headaches and worsening vision disturbance over the past week or so. She has been afebrile and has no sick contacts. Immunizations are UTD. She reports a relatively sedentary lifestyle and is overweight. What is the next step in your evaluation of this patient?