In the physical examination report, urobilinogen is indicated as negative and positive. Normally, urobilinogen is negative or weakly positive. A positive urobilinogen, on the other hand, indicates an increase. So, what is the cause of increased urobilinogen? Here’s a look. The normal value for urinary bilirubinogen is qualitatively negative or weakly positive. In quantitative testing, the normal value for children is 0.13 to 2.30 μmol/L; for adult men, 0.3 to 3.55 μmol/L; for adult women, 0.00 to 2.64 μmol/L. A weak positive urine bilirubin may be caused by irregular diet or poor rest, which is basically normal. Possible causes are: 1. When suffering from hemolytic jaundice or other hemolytic diseases, bilirubin excretion increases, and bilirubin is converted into urobilinogen in the intestinal tract. Excess urobilinogen is reabsorbed by the intestinal mucosa and returns to the liver, and the liver is unable to convert it all into bilirubin or the liver is damaged at the same time, and excess urobilinogen is excreted via the kidneys, so urinary urobilinogen increases and is positive or weakly positive. 2, abnormal liver function, the absorption of urobilinogen is impaired, it will lead to excessive urobilinogen excretion from the urine, resulting in a weak positive urobilinogen phenomenon. 3, malaria, constipation, severe burns, cardiac insufficiency, etc. will also cause weak positive urobilinogen. 4.Urobilinogen may also be weakly positive under some normal conditions, such as after a meal or alkaline urine.