Urobilinogen is converted from conjugated bilirubin. Conjugated bilirubin is unconjugated in the lower part of the small intestine and colon by the action of intestinal bacteria, and the bilirubin undergoes several stages of reduction to become urobilinogen, which is then excreted in the feces. The urinary bilirubin is determined as negative or positive. The quantification is 0.3-3.55 micromol per liter for men. Women 0-2.64 micromoles per liter. Children 0.13-2.3 micromoles per liter. So how do we diagnose an increase in urinary cholagogens? Clinically, the urobilinogen test is one of the most important methods to identify the type of jaundice. In obstructive jaundice, urinary urobilinogen may disappear and the urobilinogen test may be negative. If there is no urobilinogen in the urine for more than seven consecutive days, it suggests that it may be due to complete obstruction of the bile duct. Obstructive jaundice due to cholelithiasis presents with intermittent disappearance or reduction of urobilinogen. Hemolytic jaundice and hepatocellular jaundice both show a positive reaction to the urobilinogen test. In patients with acute hepatitis, sometimes when other tests are still normal, the urinary urobilinogen content increases and the urobilinogen test is positive. In cirrhosis and liver damage caused by poisoning, the urobilinogen test is also positive.