Bilirubin is end product of heme metabolism
All bilirubin products in the body are initially unconjugated and is transported bound to albumin into hepatocytes t o becombined with glucuronic acid into conjugated bilirubin
Conjugated bilirubin is then excreted into biliary tract
Only conjugated bilirubin is water-soluble (present in urine)
Normal bilirubin level is <1.1 (70% unconjugated)
Prehepatic (overproduction):
Hemolysis
Primarily unconjugated bili
Hepatic (inadequate processing):
Viral, alcohol, toxin
Primarily unconjugated bili
Posthepatic (underexcretion):
Pancreatic tumor, choledocholithiasis
Primarily conjugated bili
Jaundice
Hemolytic
Hematuria 
G6PD
Hematuria
Drug related
Nausea and vomiting
Autoimmune hemolytic anemia