4. Some routine blood tests to assess glucose (sugar) and lipid (fat) control and liver function, as well as an additional hepatitis screen if you have a history of hepatitis. You will go to the Intensive Research Unit (IRU) or Clinical Trials Unit (CTU) after an 8 to 10-hour overnight fast (except water). Approximately 42 ml (3 tablespoons) of blood will be obtained from you, and you will also have your height, weight, blood pressure, and waist and hip measurements taken. This will take approximately one hour.