Consultation Went Good

I went to my consultation yesterday with Dr Weber and he suggested that I walk on a tredmill 3 miles walking 3-4 mph. I have to to the last minute labs. Does anyone know what the cortisol test is for? Will try to take them next week. Have a followup appt. on January 11 due to my family's christmas vacation. He said we will set up surgery at that time. Can't wait very excited.