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Gilbert's syndrome is very
common occurring in approximately 7 percent of the population. It is the
most common cause of elevated bilirubin levels found on routine blood
work. Gilbert's is an asymptomatic disorder in which the liver has a
slightly decreased capacity to clear bilirubin from the body.
Bilirubin is produced from hemoglobin
(the red pigment of red blood cells) in the bone marrow, the spleen and
elsewhere and is carried to the liver in the blood. It undergoes chemical
changes in the liver and then is excreted into bile and passes out of the
body after further chemical changes in the intestines. Small amounts of
bilirubin are normally present in the blood. However, when there is
excessive breakdown of red blood cells or interference with bile
excretion, the amount is increased and may produce jaundice.
On occasion, a person with Gilbert's syndrome may notice
some yellowing of the skin during times of stress. In all other ways the
liver functions normally, and the condition is considered to be
harmless. The diagnosis is usually made when blood work shows an
elevated level of bilirubin in a patient who otherwise has a normal exam
and normal liver function. Additional blood work or liver biopsy is
usually not recommended to make a definitive diagnosis.
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