Urobilinogen +- is usually normal.
Under normal physiological conditions, a small portion of urobilinogen in the intestines is recycled back to the liver and then reaches the kidneys through the blood circulation and is excreted in the urine, so urobilinogen is weakly positive (+-).
Red blood cells in the blood senescence rupture degradation into hemoglobin, hemoglobin continues to decompose into hemoglobin and beads protein, hemoglobin in the catalytic enzyme action into biliverdin, biliverdin in the role of reductase is transformed into bilirubin.
At this time, bilirubin is transported to the liver through the bloodstream and converted into water-soluble bilirubin under the action of liver-related enzymes, which is discharged to the intestines through the biliary tract and forms urobilinogen under the action of intestinal bacteria. Most of the urobilinogen is discharged through the feces, and a small portion of it is reabsorbed in the intestinal wall and reabsorbed into the liver, thus forming an intestinal-hepatic cycle. A small portion is reabsorbed into the liver, forming an entero-hepatic cycle. A portion of the reabsorbed urobilinogen is excreted in the urine.
If urobilinogen +- has other discomforts, hospitalization is recommended.