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Extremely high levels of unconjugated bilirubin in plasma enables bilirubin to cross the blood-brain-barrier to reach the brain and central nervous system to impart damage. This is termed kernicterus, or bilirubin encephalopathy. Kernicterus is rare in adults but is prevalent in newborns with underdeveloped blood-brain barriers and lower ...
In biliary obstruction, below-normal amounts of conjugated bilirubin reach the intestine for conversion to urobilinogen. With limited urobilinogen available for reabsorption and excretion, the amount of urobilin found in the urine is low. High amounts of the soluble conjugated bilirubin enter the circulation where they are excreted via the kidneys.
When the total serum bilirubin increases over 95th percentile for age during the first week of life for high risk babies, it is known as hyperbilirubinemia of the newborn (neonatal jaundice) and requires light therapy to reduce the amount of bilirubin in the blood. Pathological jaundice in newborns should be suspected when the serum bilirubin ...
Urobilin is generated from the degradation of heme, which is first degraded through biliverdin to bilirubin. Bilirubin is then excreted as bile, which is further degraded by microbes present in the large intestine to urobilinogen. The enzyme responsible for the degradation is bilirubin reductase, which was identified in 2024.
Although 20% of the secreted bilirubinoid bile is reabsorbed by the small intestine, [2] conjugated bilirubin is not reabsorbed in small intestine. All conjugated bilirubin in the large intestine is metabolised by colonic bacteria to urobilinogen, which is then further oxidized to urobilin and stercobilin. Urobilin, stercobilin and their ...
Bilirubin (BR) (from the Latin for "red bile") is a red-orange compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates.This catabolism is a necessary process in the body's clearance of waste products that arise from the destruction of aged or abnormal red blood cells. [3]
In medicine, bilirubinuria is an abnormality in which conjugated bilirubin is detected in the urine. [1] The term "biliuria" is very similar, but more general. It refers to the presence of any bile pigment in the urine. Conjugated bilirubin is detected in urine at bilirubinemia of approximately 30-34 mmol/L or 2 mg/dL.
Serological abnormalities in Rotor syndrome only include elevated total serum bilirubin (typically elevated between 2 and 5 mg/dL but may be as high as 20 mg/dL). [2] Most of the time, alanine aminotransferase, aspartate aminotransferase, gamma-glutamyl transferase, and alkaline phosphatase levels are normal, but mild elevations can be seen. [2]