Bilirubin, a brownish yellow pigment of bile, secreted by the liver that gives desired colors to the solid waste products (feces). Bilirubin is produced in liver and bone marrow cells as the end-product of RBCs catabolism. In addition, the amount of bilirubin formed in the body relates directly to the quantity of red-blood cells destroyed. Moreover, lower level of bilirubin causes coronary artery diseases. However, higher level of bilirubin causes jaundice and other hepatic diseases.