certain diseases are indicated by low levels of bilirubin
hys lawlumirubinprimary biliary cirrhosisprimary sclerosing cholangitis note  references  external links bilirubin analyte monograph from the association for clinical biochemistry and laboratory medicine
drugs such as protease inhibitors like indinavir can also cause disorders of bilirubin metabolism by competitively inhibiting the ugt1a1 enzyme