<qa>  What is the BMI of the patient?We will perform colonoscopy on healthy patients with a BMI of 30-40 kgm2 who have a clear indication for a screening examination. These will be people who are above the age of 50 who have not had a screening colonoscopy in the last 10 years, or those with a family history of carcinoma of the colon who are over the age of 40 years. 