A healthy patient should have direct, or conjugated, bilirubin levels of 0 to 0.3 milligrams per deciliter of blood and 0.3 to 1.9 milligrams per deciliter of blood of total bilirubin, according to Medline Plus. A patient's bilirubin levels are checked through a simple blood test.
Bilirubin is a pigment that is yellow in color, according to Medline Plus. It is found in high concentrations in bile and is created by the liver. The concentration of bilirbuin in a person's body may also be measured by a urine test. High levels of bilirbuin in the body may be a sign of jaundice.