胆红素 Bilirubin
（重定向自Direct bilirubin）
胆红素（英文：Bilirubin）是胆色素的一种，是人类胆汁的主要色素，呈橙黄色。它是体内血红素的主要代谢产物，有毒性，可对大脑和神经系统引起不可逆的损害，但也有抗氧化剂功能，可以抑制亚油酸和磷脂的氧化。胆红素是临床上判定黄疸的重要依据，也是肝功能的重要指标。
Direct bilirubin
中文百科
英语百科
Bilirubin 胆红素
（重定向自Direct bilirubin）
![Reference ranges for blood tests, comparing blood content of bilirubin (shown in blue near center) with other constituents[22]](/uploads/202501/09/Blood_values_sorted_by_mass_and_molar_concentration4156.png)
Bilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin.
Bilirubin is excreted in bile and urine, and elevated levels may indicate certain diseases. It is responsible for the yellow color of bruises and the yellow discoloration in jaundice. It is also responsible for the brown color of feces, via its conversion to stercobilin, and the background straw-yellow color of urine via its breakdown product, urobilin.
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