Comparative Investigation of Intravenously Administered Omnipaque and Isovue: Effects on Serum Creatinine Concentration in Outpatients

Prior to having the clinically scheduled CT examination the subject will have blood work drawn. This blood work will give the investigators a baseline value of the basic kidney function of the subject. They will then have blood work done again at 2 days and again at 3 days following the CT examination. Some patients, based on their blood work obtained at 2 and 3 days after the CT examination, will be asked to have blood work performed at 7 days after their CT examination.