Bilirubin is one of the breakdown product associated with hemoglobin in red blood cells. Just before the excretion of urine, Bilirubin is concocted in the liver. The liver then modifies the Bilirubin in the bloodstream to make it more water soluble. This process is completed by conjugating Bilirubin with glucuronic acid. It is then conveyed from the liver to the gallbladder with the help of bile duct known as hepatic. Increases level of Bilirubin in your body can cause jaundice, in which your body becomes yellow. If such is the case then Bilirubin test is required to confirm if you have any of such conditions.