The bilirubin test measures bilirubin levels in the blood. Bilirubin is a yellow pigment made during the breakdown of red blood cells. Bilirubin passes through the liver and is eventually eliminated by the body , Bilirubin levels that are higher than the usual level may indicate the presence of various types of liver or bile duct problems. Sometimes, high bilirubin levels may be caused by an increased rate of damage to red blood cells.
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